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SOC 49-3042
Mobile Heavy Equipment Mechanics corresponds to the exact occupation O*NET/SOC 49-3042.00 "Mobile Heavy Equipment Mechanics, Except Engines": diagnose, adjust, repair, or overhaul mobile mechanical, hydraulic, and pneumatic equipment used in construction, logging, and mining, such as cranes, bulldozers, graders, and conveyors. Core tasks include operating and inspecting equipment to diagnose defects, repairing or replacing damaged or worn parts, disassembling and overhauling and reassembling, reading and understanding materials according to manuals and drawings, and testing equipment to ensure it meets manufacturer specifications; common job titles include Heavy Equipment Mechanic and Mobile Heavy Equipment Mechanic and Field Service Technician and Heavy Equipment Technician. Official scope text: Diagnose, adjust, repair, or overhaul mobile mechanical, hydraulic, and pneumatic equipment, such as cranes, bulldozers, graders, and conveyors, used in construction, logging, and mining. Scope note: the U.S. wage and employment and industry data presented by O*NET on the 49-3042.00 page are not marked as taken from a parent or adjacent occupation, and this page labels them faithfully according to this occupation's (49-3042.00) own scope; this occupation is Job Zone Three (medium preparation required) (6.0 to less than 7.0 (SVP 6.0 to < 7.0)), with 2024—2034 growth of Faster than average (5% to 6%) and marked Bright Outlook. The content of this page does not constitute safety, special operations, occupational health, or legal advice.
Model impact index for three equally weighted representative core tasks; not a measured share of working time or a job-loss probability. floor((50+0+25)/3+0.5)=25; fermatmind-ai-impact-v1; 2026-10-18.
Taking on judgment | Real fit comes from whether you can do three things at the same time on one repair task: do the technical work solidly (complete diagnosis and repair or overhaul and assembly and acceptance based on equipment and drawings and manuals and tests, producing usable repair and inspection records), keep safety and compliance and boundaries under control (work and keep records according to lifting and support and hot work and electrical and confined space and work permit requirements, distinguish publicly shareable information from controlled materials or materials involving customer and manufacturer technical data and handle them according to policy, and do not perform hot work or lifting or out-of-bounds handling without the required qualifications), and take on definable job responsibility (be responsible for your own diagnosis and repair and overhaul and assembly and acceptance and records, and refer matters beyond job authorization or involving special equipment and major safety matters to the appropriate position or organization according to policy). It is suggested to test this with one verifiable experience (completing a diagnosis and repair plan and an explanation of repair and inspection records for a fictitious repair request, or a review of handling a hydraulic leak or lifting or electrical anomaly), rather than relying only on the conclusion of an interest questionnaire.
Caution signals | O*NET also shows (49-3042.00, work context and task scope): exposure to hazardous equipment and heavy machinery is common; exposure to oil and grime and dust and exhaust is common; working under equipment and in narrow spaces is common; often outdoors and in workshops and exposed to extremely hot or extremely cold temperatures; serious consequences of error (equipment damage and personal injury); high responsibility for others' health and safety; and constraints from downtime and project schedules. This occupation deals with heavy mobile equipment and hydraulic and pneumatic and electrical and mechanical systems: one improper handling of a high-pressure hydraulic or pneumatic system, one improper lifting or support, one hot work or electrical work mistake, or one inadequate diagnosis or repair or assembly leading to a recurring fault can all cause equipment damage, personal injury, downtime losses, and compliance risk. O*NET places this occupation in Job Zone Three (medium preparation required) (6.0 to less than 7.0 (SVP 6.0 to < 7.0)); the education section on that page shows 55% requiring a post-secondary certificate, 30% a high school diploma or equivalent, and 8% some college courses but no degree (the page does not account for the remaining 7%); and it is marked Bright Outlook. If you find it hard to work in oily and dusty and noisy and confined and outdoor environments, find it hard to accept a rhythm that changes with equipment downtime and project schedules and possible overtime, or are unwilling to take responsibility for safety and repair quality judgments, you should treat these as real costs.
Occupational profile | The Mobile Heavy Equipment Mechanics on this page is the exact occupation O*NET 49-3042.00 (Mobile Heavy Equipment Mechanics, Except Engines), and takes on diagnosis and repair and overhaul tasks for mobile heavy equipment in equipment repair positions at construction and mining and logging and equipment rental and wholesale trade enterprises; the work is mainly on-site and workshop diagnosis and disassembly and repair and testing, accompanied by operation and inspection and records and collaboration, often performed in oily and dusty and noisy and confined and outdoor environments, and organized according to equipment downtime and project schedules.
Career direction comparison
Preface | The following comparison is presented in four columns: "career direction — core work and outputs — key differences — what it suits better". Mobile heavy equipment repair and operation and diesel engine and farm machinery and lifting positions often connect within the same equipment life cycle and construction site, but connection does not mean they are interchangeable; each position differs in subject matter, equipment, qualifications, and responsibility boundaries and must be checked separately.
| Career direction | Core work and output | Key differences | Who it suits better |
|---|---|---|---|
| This occupation: Mobile Heavy Equipment Mechanics (O*NET/SOC 49-3042.00, Mobile Heavy Equipment Mechanics, Except Engines) | Core work and outputs: operating and inspecting equipment to diagnose defects, reading manuals and drawings, disassembling and repairing or replacing and overhauling, assembling and adjusting subassemblies, testing equipment to ensure conformity with manufacturer specifications, and arranging maintenance and spare parts and records; the outputs are equipment conforming to specifications and repair and inspection records. |
AI's impact on the occupation
Editorial task judgment | Trials of manual retrieval, work order organizing, and record drafts may be conducted in an approved environment, checking equipment models, readings, versions, and test criteria. No evidence has been obtained on this occupation's generative AI adoption rate, measured effects, exposure level, or employment causality; no medium exposure rating is given, nor is it guaranteed that the occupation as a whole will not be substituted. The O*NET automation context shows 66% not automated, 20% slightly, and 13% moderately, and this cannot be converted into an AI adoption rate. The O*NET detailed page lists 7 software skill categories, and the 4 items on the hot technologies page are U.S. 2025 full-year job posting mentions: Office4%, Excel2%, Outlook2%, Word1%; this is not an enterprise adoption rate or AI usage rate, and there is no measured efficiency evidence. The precise BLS 49-3042 projection for 2025—2035: about 180,300 → 192,500 people, growth 6.7% (OOH line item about 7%), average annual openings 15,000 including replacements; self-employment in the base period 1.8%. This is not the 49-3040 occupational group's 242,400 people / 20,300 openings, and it is not real-time hiring or AI causality. AI Impact Score 25% is an editorial estimate. Model impact index for three equally weighted representative core tasks; not a measured share of working time or a job-loss probability. floor((50+0+25)/3+0.5)=25; fermatmind-ai-impact-v1; 2026-10-18.The three tasks, ratings and sources are listed in the FermatMind method source record on this page.
FermatMind AI Impact Score estimation method v1
FermatMind / 费马测试 · 2026-10-18
Mainland China salary reference
Classification mapping note | This page is the exact occupation O*NET 49-3042.00 (Mobile Heavy Equipment Mechanics), which differs from adjacent occupations such as building construction machinery operators (47-2073.00), surface mining excavating and loading machine operators (47-5022.00), bus and truck mechanics and diesel engine specialists (49-3031.00), farm equipment mechanics and service technicians (49-3041.00), and crane and tower crane operators (53-7021.00); wages and employment must be checked according to each occupation's own code and statistical scope and cannot be applied to one another.
Occupational definition | The Mobile Heavy Equipment Mechanics on this page is the exact occupation O*NET 49-3042.00 (Mobile Heavy Equipment Mechanics, Except Engines): diagnose, adjust, repair, or overhaul mobile mechanical, hydraulic, and pneumatic equipment used in construction, logging, and mining, such as cranes, bulldozers, graders, and conveyors. In the United States this occupation is Job Zone Three (medium preparation required) (6.0 to less than 7.0 (SVP 6.0 to < 7.0)) and is marked Bright Outlook.
U.S. salary reference
U.S. precise 49-3042 May2025 median annual wage $65,510 and hourly wage $31.50; the five wage percentiles have been checked. The precise BLS 49-3042 projection for 2025—2035: about 180,300 → 192,500 people, growth 6.7% (OOH line item about 7%), average annual openings 15,000 including replacements; self-employment in the base period 1.8%. This is not the 49-3040 occupational group's 242,400 people / 20,300 openings, and it is not real-time hiring or AI causality.
| Wage statistical position | Annual wage reference | Conversion boundaries | How to understand this position |
|---|---|---|---|
| Lowest 10% | 10th percentile hourly wage $22.51 / annual wage $46,820 (2025, BLS OEWS, this occupation's (49-3042.00) own scope) | Official annual wage, not individual monthly income | A national distribution position; experience, duties, or starting wages cannot be inferred backwards from it; the causes of individual wages must be checked separately. |
| Median (50%) | Median hourly wage $31.50 / median annual wage $65,510 (2025, BLS OEWS, this occupation's (49-3042.00) own scope) |
Career fit guide
Assessments cannot replace qualifications, skills, or job authorization. Drawing checks, diagnostic explanations, and anomaly reporting can be observed in safe mentoring or simulated materials; these are editorial observation suggestions, and there is no validity evidence more reliable than questionnaires.
You may be better suited to： Fit signals: willing to be responsible for equipment and personal safety and repair quality under safety and lifting and hot work and electrical requirements, able to switch between diagnosis and repair and overhaul and testing and spare parts while keeping attention on evidence and records, able to maintain procedures and evidence and review under downtime and schedule pressure, and to isolate and report according to policy when there is an equipment or safety anomaly or authorization is exceeded.
These situations require caution： Caution signals: finding it hard to work in oily and noisy and confined and outdoor environments, or finding it hard to accept overtime and a rhythm that changes with equipment downtime and project schedules, or being unwilling to take responsibility for equipment and personal safety and repair quality, or unwilling to report and hand over according to policy when authorization is exceeded.
Do an entry practice task： Verification suggestion: first test reading manuals and diagnosis and disassembly and writing records with one simulated or real equipment repair task, and understand the target enterprise's and jurisdiction's requirements for safety and occupational health and welding and lifting and electrical and confined space qualifications, before deciding whether to invest long term.
Work pressure, risks, and occupational boundaries
Direct answer | The core risk of this occupation is not "can the equipment be repaired", but four types of failure with heavier consequences: safety and personal failure (hydraulic and pneumatic high pressure, lifting and support, hot work and electrical, confined spaces and mechanical injury); quality and recurrence failure (inadequate diagnosis or repair or assembly leading to a recurring fault and a second downtime); equipment failure (improper disassembly or adjustment causing equipment damage); and record and traceability failure (distorted repair and inspection data making responsibility impossible to define).
O*NET precise tasks and context and the BLS occupational group environment support risk clues; the six cards are editorial scenarios and are not per-card incidence rates or statutory qualifications. On O*NET, hazardous equipment 71% daily, oil and grime 78% daily, noise 62% daily, narrow spaces 69% daily; frequency is not an accident rate.
Typical scenarios：Scenario | When downtime is tight, being asked to first disassemble hydraulic components without fully relieving pressure or supporting, with the paperwork to be completed later.
Entry, qualifications, and career development
The typical entry for the precise U.S. BLS 49-3042 is high school, no relevant work experience required, and long-term on-the-job training; O*NETZone3 is the occupational group preparation note, and the new-hire education of 55/30/8 is a different measure from BLS. Optional vocational courses, apprenticeship, or manufacturer training are not listed as universally required; check China catalog qualifications and enterprise authorization according to the actual equipment and tasks. The development ladder is an editorial plan and does not guarantee promotion.
Career prospects and moving to related occupations
U.S. precise 49-3042 May2025 median annual wage $65,510 / hourly wage $31.50. The precise BLS 49-3042 projection for 2025—2035: about 180,300 → 192,500 people, growth 6.7% (OOH line item about 7%), average annual openings 15,000 including replacements; self-employment in the base period 1.8%. This is not the 49-3040 occupational group's 242,400 people / 20,300 openings, and it is not real-time hiring or AI causality. Precise occupational wages and employment in China have not been obtained; the 2025 wholesale and retail industry annual average of 135,749/69,622 yuan serves only as equipment dealer repair employer background, and other employers are checked separately.
United States · SOC 49-3042.00 (OEWS 2025, as presented by O*NET)
Median hourly wage $31.50 and median annual wage $65,510; 10th percentile hourly wage 22.51 and annual wage 46,820, 25th percentile hourly wage 27.39 and annual wage 56,970, 75th percentile hourly wage 38.11 and annual wage 79,270, 90th percentile hourly wage 45.41 and annual wage 94,460
The Mobile Heavy Equipment Mechanics on this page is the exact occupation O*NET 49-3042.00 (Mobile Heavy Equipment Mechanics, Except Engines): diagnose, adjust, repair, or overhaul mobile mechanical, hydraulic, and pneumatic equipment used in construction, logging, and mining, such as cranes, bulldozers, graders, and conveyors. Core tasks include repairing and replacing damaged or worn parts, testing equipment after repair or assembly to ensure proper performance and conformity with manufacturer specifications, operating and inspecting equipment to diagnose defects, reading and understanding operating manuals and drawings and technical diagrams, and disassembling and reassembling equipment using rigging and hand tools. Common job titles include Heavy Equipment Mechanic and Mobile Heavy Equipment Mechanic and Field Service Technician.
United States side: the 2025 wages and employment presented on the O*NET 49-3042.00 page are this occupation's own scope (that page does not mark them as taken from a parent or adjacent occupation); mainland China side: public statistics have not established a national occupational wage distribution precisely corresponding to this occupation, and this page registers the gap without using proxy numbers; the institutions and statistical scopes on the two sides differ, and no combination or conversion is made.
Choose a real task from this page for a small practice project or a conversation with someone in the field. Use the planning guides to set a date, an output and feedback questions before deciding whether to continue.
Fit signals | The work activity importance for U.S. O*NET 49-3042.00 shows: repairing and maintaining mechanical equipment (88) and operating vehicles, mechanized devices, or equipment (86) and inspecting equipment, structures, or materials (85) and making decisions and solving problems (83) and obtaining information (81) and identifying objects, actions, and events (78) and communicating with supervisors, peers, or subordinates (77) are this occupation's most important activities; the work context shows: exposure to hazardous equipment and heavy machinery is common, exposure to oil and grime and dust and exhaust is common, exposure to noise is common, serious consequences of error (equipment damage and personal injury), high precision and diagnostic accuracy requirements, and constraints from downtime and project schedules. If you are willing to work with your hands on equipment fault diagnosis and disassembly and repair, can read drawings and manuals and do testing and assembly and acceptance solidly, and take responsibility for equipment and personal safety and repair quality, this occupation's daily requirements are closer to your way of working.
This checklist is only for self-questioning and does not constitute hiring criteria, a capability score, an evaluation of job competence, or any safety, special operations, occupational health, or legal advice. This page corresponds to the exact occupation O*NET/SOC 49-3042.00 "Mobile Heavy Equipment Mechanics, Except Engines" (Mobile Heavy Equipment Mechanics): diagnose, adjust, repair, or overhaul mobile mechanical, hydraulic, and pneumatic equipment used in construction, logging, and mining, such as cranes, bulldozers, graders, and conveyors. Official scope text: Diagnose, adjust, repair, or overhaul mobile mechanical, hydraulic, and pneumatic equipment, such as cranes, bulldozers, graders, and conveyors, used in construction, logging, and mining. The core tasks listed by O*NET include: repairing and replacing damaged or worn parts; testing mechanical products and equipment after repair or assembly to ensure proper performance and conformity with manufacturer specifications; operating and inspecting machines or heavy equipment to diagnose defects; reading and understanding operating manuals and drawings and technical diagrams; disassembling and reassembling heavy equipment using rigging and hand tools; and overhauling and testing machines. Common job titles include Heavy Equipment Mechanic and Mobile Heavy Equipment Mechanic and Construction Equipment Mechanic and Field Service Technician and Heavy Equipment Technician. Scope note: the U.S. wage and employment data presented by O*NET on the 49-3042.00 page are not marked as taken from a parent or adjacent occupation, and this page labels them faithfully according to this occupation's (49-3042.00) own scope; this occupation in the United States is Job Zone Three (medium preparation required) (6.0 to less than 7.0 (SVP 6.0 to < 7.0)) and is marked Bright Outlook; this page does not extrapolate the U.S. scope to mainland China's job titles, qualifications, or wages.
Practice prompt | a completely fictitious mobile heavy equipment repair task package (for practicing the process only, and not representing any real company, customer, or data). Please write a draft plan: (1) how to arrange a diagnosis and repair or overhaul in a structured way based on a fictitious fault repair request and equipment materials (equipment type and model and operating conditions, fault symptoms and operator description, hydraulic and pneumatic and electrical and mechanical systems, diagnostic steps and tests, needed tools and spare parts, repair or overhaul plan, assembly and testing and acceptance, downtime and schedule and handover), and state which information is insufficient and needs to be supplemented (equipment history and repair records, site conditions and support and lifting conditions, safety and access requirements, spare parts supply and schedule); (2) how to design filling-in and review points for a fictitious repair and inspection record form (fields and definitions, equipment and work order identifiers, faults and diagnosis, disassembly and replacement and assembly, test and acceptance data, anomalies and rework and outstanding items, original records and revision trail); (3) how to write a handover-ready repair summary (equipment — symptoms and diagnosis — disposition — testing and acceptance — outstanding items and recommendations); (4) how to record and retain equipment and repair and customer data, and distinguish publicly shareable information from controlled materials or materials involving customer and manufacturer technical data; (5) how to pause and review and isolate and report when a hydraulic or electrical or lifting or confined space risk, or going beyond job authorization or a safety risk is found. Use public materials and simulated data to answer, and do not use any real company or customer data.
Direct answer | The "Mobile Heavy Equipment Mechanics" on this page is the exact occupation O*NET 49-3042.00 (Mobile Heavy Equipment Mechanics, Except Engines), and the work can be divided into several categories: first, diagnosis and inspection — operating and inspecting equipment to diagnose defects, reading manuals and drawings and diagrams, and using diagnostic equipment and measuring tools to judge faults; second, repair and replacement — repairing or replacing damaged or worn parts, repairing electrical systems, welding or brazing damaged parts, and installing bearings; third, overhaul and assembly — disassembling and reassembling equipment using rigging and hand tools, adjusting or maintaining or repairing subassemblies, and assembling gear systems; fourth, testing and acceptance — testing equipment after repair or assembly to ensure proper performance and conformity with manufacturer specifications; fifth, maintenance and records — arranging maintenance and cleaning and lubrication and spare parts management, and recording repairs and tests and anomalies.
Records and collaboration notes | Start from the fault repair request and equipment materials and operator description, first checking the equipment type and model and operating conditions, fault symptoms and diagnosis, hydraulic and pneumatic and electrical and mechanical systems, tests and needed tools and spare parts, repair or overhaul plan, assembly and testing and acceptance, and downtime and schedule and handover, then perform diagnosis and repair and testing and hand over by work order. Matters involving lifting and support and hot work and electrical and confined space and special equipment must be carried out according to qualifications and policy, and traceable repair and inspection records must be retained.
Safety and compliance notes | Organize work according to work safety and lifting and hot work and electrical and confined space and occupational health and record requirements: diagnosis and repair and testing and disassembly must be consistent with manuals and procedures and current standards and must indicate sources and limitations, and must not replace special equipment inspection, accident determinations, or safety permit requirements; operations involving lifting and hot work and working at height and confined space and electrical work must be handled with work permits and personal protection as required; the collection and use and external provision of customer and manufacturer technical materials and drawings and data must have a lawful basis, be limited to the minimum necessary scope, and be approved and documented according to policy.
Boundary conclusion | This page corresponds to O*NET 49-3042.00 (Mobile Heavy Equipment Mechanics), and the core difference from adjacent positions lies in "subject matter and outputs and authorization level": this occupation takes the mobile heavy machinery and hydraulic and pneumatic and electrical systems used in construction and logging and mining as its subject matter, produces equipment diagnosed and repaired and overhauled and tested and conforming to manufacturer specifications together with traceable repair and inspection records, completes work and judgments within the scope of qualifications and job authorization based on mechanical and hydraulic and electrical and diagnostic ability, and is responsible for equipment and personal safety and repair quality; operators take equipment operation as the subject matter, diesel engine specialists take engines as the subject matter, and crane operators take lifting operations as the subject matter, with different responsibility and authorization levels.
| Dimension | Main direction | Comparison direction |
|---|---|---|
| Core purpose | Core purpose of this occupation | Taking mobile heavy machinery and hydraulic and pneumatic and electrical systems and drawings and manuals and manufacturer specifications as the subject matter, complete work within the scope of qualifications and safety and authorization: diagnosis and inspection, repair and replacement, overhaul and assembly, testing and acceptance, maintenance and spare parts and records, producing equipment conforming to specifications and traceable records. | Core concept of adjacent positions | Most positions in the same group and adjacent positions aim to "maintain or operate machinery or systems to the specified state within equipment and safety and quality requirements and keep records", with differences in subject matter and outputs and authorization level: some take the repair and overhaul of heavy mobile equipment as the subject matter, and some take operation or engines or lifting or farm equipment as the subject matter. |
| Main subject matter and basis | Main subject matter and basis of this occupation | Taking equipment type and model and operating conditions, fault symptoms and diagnosis, hydraulic and pneumatic and electrical and mechanical systems, drawings and manuals and manufacturer specifications, tools and spare parts, repair and overhaul and assembly processes, testing and acceptance requirements, and safety and lifting and hot work and metrology requirements as the subject matter, complete work and judgments according to repair manuals and manufacturer specifications and work safety and occupational health and metrology requirements. | Main subject matter and basis of adjacent positions | Building construction machinery operators rely on equipment operation and construction procedures; surface mining excavating and loading machine operators rely on mining equipment operating procedures; bus and truck mechanics and diesel engine specialists rely on vehicle and engine repair specifications; farm equipment mechanics rely on agricultural machinery repair and technical specifications; crane and tower crane operators rely on lifting operation procedures. Most of them take operation or engines or farm machinery or lifting as the subject matter, which differs from this occupation's repair and overhaul of mobile heavy equipment. |
| Core processes | Core processes of this occupation | Accepting the repair request and checking materials, on-site inspection and diagnosis and testing, disassembly and repair or replacement and overhaul, assembly and adjustment and subassemblies, performance testing and acceptance, records and spare parts and handover; each step must be performed according to manuals and procedures and be reviewable by quality control and supervisors and operators. | Core processes of adjacent positions | Operators focus on operation and construction; diesel engine specialists focus on engine diagnosis and repair; farm equipment mechanics focus on agricultural machinery repair; crane operators focus on lifting operations; this occupation focuses on diagnosis and repair and overhaul and assembly and testing of mobile heavy equipment. |
| Main outputs | Main outputs of this occupation | Equipment diagnosed and repaired and overhauled and assembled and passing performance testing and conforming to manufacturer specifications, repair and inspection and test records, spare parts and inventory and maintenance records, anomaly and rework and outstanding item records, and traceable work order and handover records. | Main outputs of adjacent positions | Operators produce construction work and equipment operation records; diesel engine specialists produce vehicle and engine repair records; farm equipment mechanics produce agricultural machinery repair records; crane operators produce lifting operation records; these differ from this occupation's mobile heavy equipment repair and inspection records. |
| Responsibility holder | This occupation is responsible for the diagnosis and repair and overhaul and assembly and testing and records it personally performs, and for the work performed according to manuals and procedures and qualification requirements; matters involving special equipment inspection, lifting and hot work and electrical and major safety matters must be referred to the appropriate position or organization according to qualifications and job authorization and policy. | Responsible parties of adjacent positions | Responsibility for positions in the same group and adjacent positions is usually defined by the affiliated enterprise and equipment and safety and quality systems, and the objects of responsibility are mostly equipment and personal safety and production continuity. |
| Authority and approval | Authority and approval of this occupation | Daily diagnosis and repair and overhaul and assembly and testing must be carried out within the scope of qualifications and job authorization and manuals and procedures; matters involving special equipment inspection, lifting and hot work and electrical and confined space operations, and equipment modification and major repair must be carried out according to policy and qualifications; matters involving welding and lifting and electrical qualifications and work permits are governed by the requirements of the competent authority and the enterprise. | Authority and approval of adjacent positions | The authority of positions in the same group and adjacent positions comes from enterprise authorization and equipment and safety and professional specifications, and usually does not include the authority to decide on design changes or major dispositions beyond one's own authorization or scope; matters involving equipment modification and special equipment and major repair and safety matters should be transferred to the appropriate position or organization. |
| Boundaries of conclusions | Conclusion boundaries of this occupation | Diagnosis and repair and testing and acceptance conclusions state only verifiable test data and repair content and results, and distinguish measured facts from judgment inferences and items to be verified; conclusions on matters beyond one's own qualifications (special equipment inspection conclusions, accident determinations, final equipment acceptance) must not be issued in one's own name. | Conclusion boundaries of adjacent positions | Conclusions of positions in the same group and adjacent positions are mostly limited to this equipment or this process level and usually do not constitute a determination of the equipment's final safety or compliance or legal liability; conclusions that cross disciplines or involve special equipment and major safety have limits on their applicability. |
Operating and inspecting equipment to diagnose defects, reading manuals and drawings and technical diagrams, and using diagnostic equipment and measuring tools to judge faults.
Repairing or replacing damaged or worn parts, repairing or rewiring and troubleshooting electrical systems, welding or brazing damaged parts, and installing bearings.
Disassembling and reassembling equipment using rigging and hand tools, adjusting or maintaining or repairing subassemblies, and assembling gear systems.
Testing equipment after repair or assembly to ensure proper performance and conformity with manufacturer specifications.
Arranging maintenance schedules, cleaning and lubricating equipment, and ordering and maintaining spare parts inventory.
Working according to lifting and support and hot work and electrical and confined space and work permit requirements and guiding and collaborating, and handling anomalies and reporting.
Pre-onboarding checklist notes | The following six items are used to check off one by one before applying and onboarding, to avoid inferring actual duties and authorization from the job title or promotional language; the check results should be based on written recruitment information and the employment contract and job description and equipment and safety system documents, and should be continuously confirmed after onboarding. This page only lists checklist points and does not constitute a hiring or safety conclusion.
Checklist point notes | Job titles are similar but duties and authorization differ greatly: some focus on field service and diagnosis, some on workshop overhaul and assembly, some on specific equipment (construction machinery or mining equipment or farm machinery or lifting equipment), and some also cover electrical and hydraulic systems; different enterprises and jurisdictions have different requirements for special operations and qualifications and safety, so check first and then judge fit.
| Key difference: this occupation takes mobile heavy machinery and hydraulic and pneumatic and electrical systems as its subject matter, completing diagnosis and repair and overhaul and testing within the scope of qualifications and job authorization based on mechanical and hydraulic and electrical and diagnostic ability, and is responsible for equipment and personal safety and repair quality; adjacent positions take operation or engines or farm machinery or lifting as their subject matter, with different specialties and authorization. |
| Better suited to people who are willing to work with their hands on equipment fault diagnosis and disassembly and repair, can read drawings and manuals and do testing and assembly and acceptance solidly, and take responsibility for safety and repair quality. |
| Building construction machinery operators (Building Construction Machinery Operators, 47-2073.00) | Core work and outputs: taking the operation of construction machinery and construction work as the subject matter, producing construction work and equipment operation records. | Key difference: it takes equipment operation as the subject matter, producing construction work and operation records; this occupation takes equipment diagnosis and repair and overhaul as the subject matter, producing repair and inspection records, with different directions of duties. | Better suited to people who are willing to engage in construction machinery operation and construction; this occupation is more oriented toward equipment diagnosis and repair and overhaul. |
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| Surface mining excavating and loading machine and dragline operators (Surface Mining Excavating and Loading Machine and Dragline Operators, 47-5022.00) | Core work and outputs: taking the operation of surface mining excavating and loading equipment as the subject matter, producing mining operation and equipment operation records. | Key difference: it takes mining equipment operation as the subject matter, producing mining operation records; this occupation takes equipment repair and overhaul as the subject matter, producing repair and inspection records, with a different operating object. | Better suited to people who are willing to engage in surface mining equipment operation; this occupation is more oriented toward equipment diagnosis and repair and overhaul. |
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| Bus and truck mechanics and diesel engine specialists (Bus and Truck Mechanics and Diesel Engine Specialists, 49-3031.00) | Core work and outputs: taking the diagnosis and repair of bus and truck vehicles and diesel engines as the subject matter, producing vehicle and engine repair records. | Key difference: it takes vehicle and engine repair as the subject matter, producing vehicle repair records; this occupation takes mobile heavy machinery and hydraulic and pneumatic and electrical systems as the subject matter, with different equipment types and systems. | Better suited to people who are willing to engage in vehicle and diesel engine repair; this occupation is more oriented toward diagnosis and repair and overhaul of mobile heavy equipment. |
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| Farm equipment mechanics and service technicians (Farm Equipment Mechanics and Service Technicians, 49-3041.00) | Core work and outputs: taking the diagnosis and repair and maintenance of agricultural machinery as the subject matter, producing farm machinery repair and maintenance records. | Key difference: it takes farm machinery repair as the subject matter, producing farm machinery repair records; this occupation takes mobile heavy equipment used in construction and mining and logging as the subject matter, with different equipment types. | Better suited to people who are willing to engage in farm machinery repair and maintenance; this occupation is more oriented toward diagnosis and repair of construction and mining heavy equipment. |
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| Crane and tower crane operators (Crane and Tower Crane Operators, 53-7021.00) | Core work and outputs: taking the lifting operations of cranes and tower cranes as the subject matter, producing lifting operation and safety records. | Key difference: it takes lifting operations as the subject matter, producing lifting and safety records; this occupation takes equipment repair and overhaul as the subject matter, producing repair and inspection records, with a different nature of work. | Better suited to people who are willing to engage in crane and tower crane lifting operations; this occupation is more oriented toward equipment diagnosis and repair and overhaul. |
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Conclusion | The core difference between this page (O*NET 49-3042.00 Mobile Heavy Equipment Mechanics) and adjacent positions lies in "subject matter and outputs and authorization level": this occupation takes the mobile heavy machinery and hydraulic and pneumatic and electrical systems used in construction and logging and mining as its subject matter, producing equipment diagnosed and repaired and overhauled and tested and conforming together with traceable repair and inspection records; operators and diesel engine specialists and farm equipment mechanics and crane operators focus on their own subject matter, with different outputs and authorization levels.
Transition | This page places adjacent positions side by side by "subject matter and outputs and authorization level" in order to help you judge which kind of equipment repair or operating position you want to invest in long term. Whichever direction you choose, what really determines whether you can take the job is the equipment and system and safety and qualification ability of that direction, together with the target enterprise's and jurisdiction's requirements for training and special operations and qualifications; wages and employment must be checked according to each occupation's own code and statistical scope and cannot be applied to one another.
Editorial ratings use the existing occupational responsibilities and AI task analysis on this page. They are not adoption rates, measured effects, job-disappearance or personal-unemployment probabilities, or official scores from Stanford or another external institution. No measured time weights or future robot deployment are assumed.
Technical feasibility: a task may be technically reachable by equipment or a system; this is only a feasibility judgment and does not mean it is permitted to be used, nor that it has been adopted by an enterprise.
Enterprise and regulatory adoption: whether to introduce it depends on lifting and hot work and electrical and special equipment and safety requirements and on enterprise equipment and safety management systems; responsibility for equipment and personal safety cannot be transferred by introducing a system.
The precise BLS 49-3042 projection for 2025—2035: about 180,300 → 192,500 people, growth 6.7% (OOH line item about 7%), average annual openings 15,000 including replacements; self-employment in the base period 1.8%. This is not the 49-3040 occupational group's 242,400 people / 20,300 openings, and it is not real-time hiring or AI causality.
| Work direction | Tasks | Current changes | Human control points |
|---|---|---|---|
| Diagnostic data can be assisted, judgment is the person's responsibility | Diagnosis and inspection | Operating and inspecting equipment to diagnose defects and reading manuals and drawings | Fault judgment and diagnostic steps and safety confirmation are the person's responsibility (human control point) |
| Repair records can be assisted, repair judgment is the person's responsibility | Disassembly and replacement | Repairing or replacing damaged or worn parts and installing bearings | Disassembly and replacement and assembly are the person's responsibility according to procedures (human control point) |
| Test readings can be assisted, disposition judgment is the person's responsibility | Hydraulic and pneumatic and electrical | Repairing hydraulic and pneumatic systems and repairing or troubleshooting electrical systems | Hydraulic and electrical handling and safety isolation are the person's responsibility according to qualifications (human control point) |
| Materials can be assisted, assembly judgment is the person's responsibility | Overhaul and assembly | Disassembling and reassembling equipment using rigging and hand tools and assembling gear systems | Overhaul and assembly and adjustment are the person's responsibility according to qualifications (human control point) |
| Test equipment can be assisted, acceptance judgment is the person's responsibility | Testing and acceptance | Testing equipment after repair or assembly to ensure proper performance and conformity with manufacturer specifications | Testing and acceptance and specification conformity judgment are the person's responsibility (human control point) |
| Inventory systems can be assisted, judgment is the person's responsibility | Maintenance and spare parts | Arranging maintenance and cleaning and lubricating equipment and ordering and maintaining spare parts inventory | Maintenance schedules and spare parts and outsourcing judgments are the person's responsibility (human control point) |
| Anomaly records can be assisted, determination and disposition responsibility is the person's responsibility | Safety and anomaly handling | Identifying hydraulic or electrical or lifting or confined space anomalies and isolating and reporting them | Anomaly identification and isolation and reporting and rework requests are completed by the person according to authorization (human control point) |
Evidence preface | Citation rules: cite only sources that can support the claims on this page; indicate the jurisdiction, period, statistical scope, and whether it is the 49-3042.00 own scope; general research focused on broad occupational groups must not be used to infer changes to individual positions in this occupation; a technology list does not mean adoption; a mention of diagnostic and automation tools does not mean a transfer of responsibility.
Difference preface | Below, adjacent positions are compared by "what AI and automation mainly change / what people remain responsible for". The conclusion is consistent: what equipment and systems can enhance is work orders and readings and spare parts and reports and knowledge retrieval; on-site diagnosis and disassembly and repair and hydraulic and electrical and safety responsibility always rest with personnel holding the corresponding qualifications and authorization. Technical feasibility, whether an enterprise adopts it (which depends on lifting and hot work and electrical and special equipment requirements), and job outcomes must be judged separately.
What AI mainly changesWork orders and equipment ledgers and diagnostic readings and spare parts and report drafts can be handled by equipment and systems
Still the responsibility of peopleOn-site fault judgment and disassembly and repair and hydraulic and electrical and acceptance responsibility
What AI mainly changesMulti-equipment and fault and downtime and spare parts and repair data aggregation and statistics can be accelerated by tools
Still the responsibility of peopleEquipment modification and safety and acceptance and external disclosure decisions
What AI mainly changesRepair manual and procedure and fault knowledge retrieval and drafts can be generated by tools
Still the responsibility of peopleContent evidence and safety and quality review and special equipment and modification responsibility
Responsibility preface | Efficiency can be outsourced to equipment and systems, but on-site diagnosis and repair and overhaul judgment and hydraulic and electrical and safety and acceptance responsibility cannot. The following five steps are the human responsibility points that must be preserved before and after adopting any digital tool or automated data and report generation.
Equipment and boundaries: equipment conditions and systems and safety boundaries must be determined by personnel holding the corresponding qualifications and authorization, and equipment and systems do not replace on-site and professional judgment.
Data and methods: diagnostic readings and test and spare parts and repair data and their sources and calibration must be checked and reviewed by the person, and insufficient or deviating data must be clearly stated, and gaps must not be concealed by system output.
Conclusions and determinations: diagnosis and repair and overhaul and acceptance conclusions must be made by the person according to manuals and procedures and manufacturer specifications, and system output must not be used directly as a basis for release or modification or external publication.
Safety and compliance: lifting and support and hot work and electrical and confined space and work permits and personal protection must follow safety and occupational health requirements and be carried out according to policy, and controlled materials must be managed under confidentiality and retention period requirements.
Changes and disclosure: equipment parameters and status and information disclosure and equipment modification changes must be carried out within the scope of authorization and policy, and when a hydraulic or electrical or lifting or safety or exceeding-authorization anomaly is found, operations must be paused and isolated and reported according to policy.
Using system-generated diagnosis or parameter suggestions directly for repair or release
Control method:Diagnosis and safety and quality responsibility must be verified and documented by the person according to qualifications and procedures
Controlled materials or materials involving customer and manufacturer technical data being mistakenly sent or flowing into unauthorized channels
Control method:Limit the purpose and retention period and access rights, and do not upload controlled materials to external services or unauthorized environments
Missing model, template, tool, and parameter versions making suggestions non-reproducible and non-traceable.
Control method:Keep record versions, inputs and outputs, and manual review, and verify version changes against actual equipment.
Unit errors in pressure, displacement, dimensions, equipment models, or instrument readings causing misjudgment of repair and verification.
Control method:Check the original readings, equipment identifiers, units, and instrument status, do not generate false data, and stop and review when anomalies occur.
Vague attribution of responsibility: unclear who diagnoses, who determines conformity, and who approves modifications and disclosure
Control method:Before adopting a system, clarify the operations and application and approval path and responsible persons and keep records
Apply digital tools to reversible supporting steps: organizing work orders and equipment ledgers, retrieving repair manuals and spare parts, entering diagnostic and test readings; disassembly and repair and safety judgments are governed by mentoring and authorization.
Use diagnostic software and repair management systems for readings and trends and work order records; fault judgment and repair and overhaul and acceptance judgments remain the responsibility of the person according to qualifications and procedures.
Use tools for multi-equipment data aggregation and fault and downtime and spare parts trend analysis; complex and controlled matters (hydraulic and electrical and special equipment and major safety) are confirmed by the person together with supervisors or manufacturers.
Use tools for repair and quality and safety and cost and downtime statistics and reports and knowledge management; major conclusions and equipment modifications and external disclosure must be manually approved and documented.
There is no evidence to determine the year the position will disappear, nor can it be guaranteed that it will never be eliminated. The precise BLS 49-3042 projection for 2025—2035: about 180,300 → 192,500 people, growth 6.7% (OOH line item about 7%), average annual openings 15,000 including replacements; self-employment in the base period 1.8%. This is not the 49-3040 occupational group's 242,400 people / 20,300 openings, and it is not real-time hiring or AI causality.
Source:O*NET tasks; not a substitution forecastOriginal materials ↗
The O*NET detailed page lists 7 software skill categories, and the 4 items on the hot technologies page are U.S. 2025 full-year job posting mentions: Office4%, Excel2%, Outlook2%, Word1%; this is not an enterprise adoption rate or AI usage rate, and there is no measured efficiency evidence. Specific programming, equipment commissioning, and hiring requirements are checked separately.
Source:U.S. 2025 job posting skill mentionsOriginal materials ↗
Work order and equipment ledger organizing and entry, diagnostic readings and fault and spare parts statistics, report and document drafts, and repair knowledge retrieval; these steps can be shared by diagnosis and repair management and reporting tools.
Source:O*NET tasks; editorial assistance suggestionOriginal materials ↗
The precise BLS 49-3042 projection for 2025—2035: about 180,300 → 192,500 people, growth 6.7% (OOH line item about 7%), average annual openings 15,000 including replacements; self-employment in the base period 1.8%. This is not the 49-3040 occupational group's 242,400 people / 20,300 openings, and it is not real-time hiring or AI causality.
Source:BLS2025—2035 precise projectionOriginal materials ↗
Cannot be taken on by itself. On-site diagnosis and disassembly and repair and hydraulic and electrical parameters and acceptance are the responsibility of personnel and enterprises holding the corresponding qualifications and authorization; systems can assist with diagnosis and record data as configured, but diagnostic criteria and repair and overhaul and release decisions and safety judgments must be set and confirmed by people.
Source:NIST general governance, safety qualifications to be checked separatelyOriginal materials ↗
There is no evidence to determine the year the position will disappear, nor can it be guaranteed that it will never be eliminated. The precise BLS 49-3042 projection for 2025—2035: about 180,300 → 192,500 people, growth 6.7% (OOH line item about 7%), average annual openings 15,000 including replacements; self-employment in the base period 1.8%. This is not the 49-3040 occupational group's 242,400 people / 20,300 openings, and it is not real-time hiring or AI causality.
Source:BLS projection; no disappearance year inferredOriginal materials ↗
Priority should be given to mastering equipment diagnosis and disassembly and repair and overhaul and assembly and testing of hydraulic and pneumatic and electrical and mechanical systems, reading manuals and drawings, lifting and support and hot work and confined space and safe operations, and the ability to adhere to procedures and evidence and records and anomaly reporting under downtime and schedule pressure; digital tools only need to be usable.
Source:O*NET tasks; editorial learning suggestionOriginal materials ↗
Editorial suggestion | Conduct authorized trials of retrieval and recording assistance and check the real effect; they do not replace original readings, repair, performance verification, or safety responsibility, and there is no measured efficiency evidence for this occupation.
Average annual wage 135,749 yuan/year; the average for all employed persons in the industry, not this occupation's wage.
Average annual wage 69,622 yuan/year; the average for all employed persons in the industry, not this occupation's wage.
Insufficient evidence: public occupational statistics in mainland China have not established a national occupational wage distribution precisely corresponding to O*NET 49-3042.00 (Mobile Heavy Equipment Mechanics); the National Bureau of Statistics publishes average wages of urban unit employees by industry category without distinguishing occupations, and this page does not fill in the gap with industry averages, recruitment offers, or U.S. data.
Mainland China section | In mainland China there are positions in the construction machinery and heavy equipment repair field similar to Mobile Heavy Equipment Mechanics, and their work and lifting and hot work and working at height and confined space and safety and occupational health and records are governed by the Work Safety Law of the People's Republic of China and related regulations and standards on special operations and occupational health and environmental protection and metrology; however, public occupational statistics do not list a national wage distribution separately for this occupation.
| Education background | Common position directions | Notes and verification advice |
|---|---|---|
| Mechanical and hydraulic or electrical related education and training | Most positions | Meets the mechanical and hydraulic and electrical and safety knowledge starting point for entry; the education section on that page shows 55% requiring a post-secondary certificate, 30% a high school diploma or equivalent, and 8% some college courses but no degree (the page does not account for the remaining 7%) |
| Diagnosis and disassembly and repair and overhaul and testing ability | All positions | Positions usually require the ability to diagnose faults and disassemble and repair and overhaul and assemble and test, and to comply with lifting and hot work and electrical and confined space safety requirements |
| Welding and lifting and electrical and confined space qualifications | Positions involving the corresponding operations | The typical U.S. BLS profile for this precise occupation is high school, no relevant experience required, and long-term on-the-job training; the O*NET education required for new hires is 55% post-secondary certificate / 30% high school / 8% some college, which are different measures. Apprenticeship and manufacturer certification are not universally required; in China, qualifications are verified according to the actual catalog trades and operations. |
| Occupational health and labor protection requirements | Positions involving oil and grime and dust and noise and confined spaces | Those exposed to occupational disease hazards receive examinations and protection as required; position adjustment depends on the actual hazards and results, and fixed rotation requirements are not listed for all positions. |
Matching rationale | Equipment dealer repair positions can reference wholesale and retail trade; construction, mining, rental, or independent repair units may belong to other categories, and the category wage cannot be applied to all heavy equipment mechanics; the broad reference is the 2025 annual average wage of 135,749/69,622 yuan for urban non-private/private units in wholesale and retail trade. The statistics cover multiple occupations and levels in that industry and cannot be filled in for this occupation's median, starting wage, or personal income. This round has not obtained a precise national wage distribution for this occupation, and the gap is retained.
O*NET shows on the 49-3042.00 page that this occupation's main industries in the United States are wholesale trade and construction; the National Bureau of Statistics publishes average wages of urban unit employees by industry category, and the wholesale and retail and construction category scopes cover multiple occupations and cannot replace this occupation's wages.
Some equipment repair positions serve mining and logging and agriculture; this scope is an industry average, is not equal to this occupation's wages, and is not filled in on this page.
Some positions can be classified under equipment rental and engineering services; this scope is an industry average, is not equal to this occupation's wages, and is not filled in on this page.
AI exposure | The work order and readings and spare parts and reports and knowledge retrieval draft steps of this occupation can be assisted by generative and statistical tools, and automation exposure is moderate; the direct impact of generative AI itself on it is concentrated in data and documents and retrieval organization; this page does not score or predict its AI impact.
| Official annual wage, not an individual's actual take-home pay |
| The median represents the typical level at the midpoint of the distribution, but does not represent the entry-level starting wage; it rises with region, industry, equipment, skills, qualifications, and scope of duties; it is this occupation's own scope and does not represent adjacent occupations. |
| Highest 10% | 90th percentile hourly wage $45.41 / annual wage $94,460 (2025, BLS OEWS, this occupation's (49-3042.00) own scope) | Official annual wage, not an individual's actual take-home pay | A national distribution position; experience, duties, or starting wages cannot be inferred backwards from it; the causes of individual wages must be checked separately. |
|---|
Wage · 10th percentile：May2025 10th percentile annual wage $46,820; hourly wage $22.51；Scope | 49-3042 national wages May2025, projections 2025—2035； boundaries | percentiles are not seniority or starting wages, OEWS includes production bonuses and excludes benefits, overtime, and non-production bonuses； EP includes self-employment, and openings include replacements.
Wage · 25th percentile：May2025 25th percentile annual wage $56,970; hourly wage $27.39；Scope | 49-3042 national wages May2025, projections 2025—2035； boundaries | percentiles are not seniority or starting wages, OEWS includes production bonuses and excludes benefits, overtime, and non-production bonuses； EP includes self-employment, and openings include replacements.
Wage · median：May2025 50th percentile annual wage $65,510; hourly wage $31.50；Scope | 49-3042 national wages May2025, projections 2025—2035； boundaries | percentiles are not seniority or starting wages, OEWS includes production bonuses and excludes benefits, overtime, and non-production bonuses； EP includes self-employment, and openings include replacements.
Wage · 75th percentile：May2025 75th percentile annual wage $79,270; hourly wage $38.11；Scope | 49-3042 national wages May2025, projections 2025—2035； boundaries | percentiles are not seniority or starting wages, OEWS includes production bonuses and excludes benefits, overtime, and non-production bonuses； EP includes self-employment, and openings include replacements.
Wage · 90th percentile：May2025 90th percentile annual wage $94,460; hourly wage $45.41；Scope | 49-3042 national wages May2025, projections 2025—2035； boundaries | percentiles are not seniority or starting wages, OEWS includes production bonuses and excludes benefits, overtime, and non-production bonuses； EP includes self-employment, and openings include replacements.
Distribution reading: the median is the midpoint of the distribution and is not equal to the starting point; for this occupation, the annual wage from the 10th percentile to the 90th percentile spans about from $46,820 to $94,460, with differences mainly from region and industry and equipment and skills and qualifications and duties.
Scope reading: OEWS reports wages reported by employers, including production incentive bonuses and excluding benefits, overtime, and non-production bonuses; the values on this page are presented by O*NET on the 49-3042.00 page and that page does not mark them as taken from a parent or adjacent occupation, so they are presented according to this occupation's own scope, and individual income in adjacent occupations must not be inferred from them.
Wages are May2025 OEWS as presented by O*NET on the precise national page; the projection is the BLS49-3042 2025—2035 matrix, including 1.8% self-employment in the base period, which differs in coverage from employee wages.
Usage suggestion: read the three sets of figures — median, percentiles, and employment — together with "this occupation's own scope, not representing adjacent occupations" and "2025—2035 growth of 6.7% and marked Bright Outlook, with openings consisting mainly of replacement needs", to avoid treating the median as a starting wage or the projection as an individual outcome.
| Industry | Median wage for the 49-3040 occupational group within the industry (broad scope background) | How to understand |
|---|---|---|
| Government (excluding state and local education and hospitals) (49-3040 occupational group background) | $70,350/year | OOH May2025 heavy vehicle and mobile equipment service 49-3040 occupational group industry median, not the precise 49-3042; precise industry-level wages have not been obtained, and China is not extrapolated. |
| Transportation and warehousing (49-3040 occupational group background) | $68,600/year | OOH May2025 heavy vehicle and mobile equipment service 49-3040 occupational group industry median, not the precise 49-3042; precise industry-level wages have not been obtained, and China is not extrapolated. |
| Heavy and civil engineering construction (49-3040 occupational group background) | $63,770/year | OOH May2025 heavy vehicle and mobile equipment service 49-3040 occupational group industry median, not the precise 49-3042; precise industry-level wages have not been obtained, and China is not extrapolated. |
| Rental and leasing services (49-3040 occupational group background) | $61,620/year | OOH May2025 heavy vehicle and mobile equipment service 49-3040 occupational group industry median, not the precise 49-3042; precise industry-level wages have not been obtained, and China is not extrapolated. |
Repair complexity and demand differ noticeably across industries (wholesale trade and construction and mining and logging and agriculture) and equipment types, affecting income and stability.
Whether the person masters hydraulic and electrical and diagnostic and welding and special operations and multi-equipment repair abilities, and whether the person holds the related qualifications, noticeably affects income.
Positions that take on field service and travel and specialty equipment and team-leading and equipment management duties have duties and pay structures different from positions focused on basic repair.
Scope | 49-3042 national wages May2025, projections 2025—2035； boundaries | percentiles are not seniority or starting wages, OEWS includes production bonuses and excludes benefits, overtime, and non-production bonuses； EP includes self-employment, and openings include replacements.
Scope | 49-3042 national wages May2025, projections 2025—2035； boundaries | percentiles are not seniority or starting wages, OEWS includes production bonuses and excludes benefits, overtime, and non-production bonuses； EP includes self-employment, and openings include replacements.
Scope | 49-3042 national wages May2025, projections 2025—2035； boundaries | percentiles are not seniority or starting wages, OEWS includes production bonuses and excludes benefits, overtime, and non-production bonuses； EP includes self-employment, and openings include replacements.
Which Holland interest type is closer to Mobile Heavy Equipment Mechanics?
Holland (RIASEC) | Used to understand your relative position on realistic and conventional and investigative preferences. The O*NET interest code for this occupation is RCI (Realistic—Conventional—Investigative), corresponding to a willingness to repair equipment and machinery by hand (Realistic), a willingness to organize information and data according to procedures and rules (Conventional), and analyzing fault problems with evidence and technology (Investigative).
Do not use it this way:If you find it hard to work in oily and dusty and noisy and confined and outdoor environments, find it hard to accept a rhythm that changes with equipment downtime and project schedules and possible overtime, or are unwilling to take responsibility for equipment and personal safety and repair quality, a high interest questionnaire score cannot change this real cost; for this occupation you must also confirm the enterprise's requirements for welding and lifting and electrical and confined space and occupational health.
Test my Holland occupational interestsWhich Big Five traits are more relevant to this job?
Editorial suggestion to observe manual checking, detail inspection, and safety behavior; Big Five traits cannot be used to infer greater ease of adapting to a repair position.
Do not use it this way:Do not use a personality assessment saying you are unsuited as a basis for giving up or not entering the field; use equipment repair job shadowing or internships or simulated diagnosis and repair tasks and mentoring evaluations and assessment results instead.
View my Big Five personality traitsCan the MBTI be used to judge whether I am suited to Mobile Heavy Equipment Mechanics?
MBTI | Typology is used for self-reflection on communication and work preferences; this occupation requires coordination with operators and supervisors and suppliers, and preference does not determine competence.
Do not use it this way:Treat the type only as a reference for communication style, and do not use it to infer whether you or others can do diagnosis and repair and overhaul work well.
Learn about my MBTI preferencesCan the Enneagram tell whether I am suited to this occupation?
Enneagram | Used to observe how you react in situations of downtime and schedules and equipment anomalies; when a hydraulic or electrical or lifting or confined space issue arises or authorization is exceeded, whether you can first check and handle it according to evidence and policy matters more than the type label.
Do not use it this way:Do not use type labels to explain quality or safety disputes; return to whether the manual basis and the work process and records were adequate.
Explore my Enneagram patternCan someone who is not good at math be a Mobile Heavy Equipment Mechanic?
Editorial suggestion to observe drawings, system principles, and reading checks; there is no evidence comparing the predictive validity of IQ and practical ability.
Do not use it this way:A high or low score cannot show whether you can learn diagnosis and disassembly and repair and overhaul; test this through equipment repair job shadowing or internships or simulated tasks and mentoring evaluations.
Learn about my intelligence and reasoning performanceDoes being a Mobile Heavy Equipment Mechanic require high emotional intelligence?
Editorial suggestion to observe communication under downtime pressure, anomaly reporting, and review; repair quality or safety cannot be inferred from EQ scores.
Do not use it this way:Emotional abilities can be improved through actual work and mentoring and deliberate practice, and there is no need to limit yourself with assessment scores.
Learn about my emotional intelligence abilitiesBetter match:Able to independently complete diagnosis and repair and overhaul and assembly and testing and records within the scope of qualifications and job authorization and procedures
Note:Editorial comparison suggestion | If you find it hard to work in oily and noisy and confined and outdoor environments, or find it hard to accept overtime and a rhythm that changes with equipment downtime and schedules, the actual work experience needs to be checked.
View related occupations:This occupation's (Mobile Heavy Equipment Mechanics) directionBetter match:Possessing the operation or repair or inspection abilities of building construction machinery operators and the corresponding qualifications
Note:Editorial comparison suggestion | If you want to take mobile heavy equipment diagnosis and repair and overhaul as the subject matter rather than this direction, you can compare this occupation's differences again.
View related occupations:Building construction machinery operator directionBetter match:Possessing the operation or repair or inspection abilities of surface mining excavating and loading machine and dragline operators and the corresponding qualifications
Note:Editorial comparison suggestion | If you want to take mobile heavy equipment diagnosis and repair and overhaul as the subject matter rather than this direction, you can compare this occupation's differences again.
View related occupations:Surface mining excavating and loading machine and dragline operator directionBetter match:Possessing the operation or repair or inspection abilities of bus and truck mechanics and diesel engine specialists and the corresponding qualifications
Note:Editorial comparison suggestion | If you want to take mobile heavy equipment diagnosis and repair and overhaul as the subject matter rather than this direction, you can compare this occupation's differences again.
View related occupations:Bus and truck mechanic and diesel engine specialist directionBetter match:Possessing the operation or repair or inspection abilities of farm equipment mechanics and service technicians and the corresponding qualifications
Note:Editorial comparison suggestion | If you want to take mobile heavy equipment diagnosis and repair and overhaul as the subject matter rather than this direction, you can compare this occupation's differences again.
View related occupations:Farm equipment mechanic and service technician directionBetter match:Possessing the operation or repair or inspection abilities of crane and tower crane operators and the corresponding qualifications
Note:Editorial comparison suggestion | If you want to take mobile heavy equipment diagnosis and repair and overhaul as the subject matter rather than this direction, you can compare this occupation's differences again.
View related occupations:Crane and tower crane operator directionPersonality type and introversion or extraversion are not validated occupational thresholds; you can observe diagnosis, manual checking, and anomaly reporting, without comparing the predictive validity of personality and skills.
Personality type and introversion or extraversion are not validated occupational thresholds; you can observe diagnosis, manual checking, and anomaly reporting, without comparing the predictive validity of personality and skills.
Personality type and introversion or extraversion are not validated occupational thresholds; you can observe diagnosis, manual checking, and anomaly reporting, without comparing the predictive validity of personality and skills.
Which MBTI type is most suitable for this occupation? No type has been proven most suitable. MBTI is not an occupational qualification or ability assessment tool, and occupational adaptation mainly depends on skills and qualifications and safety and procedural compliance.
Which Holland interest type is more suitable for this occupation? The O*NET interest code is RCI: Realistic (repairing equipment and machinery by hand) and Conventional (organizing information and data according to procedures and rules) and Investigative (analyzing fault problems with evidence and technology).
Personality type and introversion or extraversion are not validated occupational thresholds; you can observe diagnosis, manual checking, and anomaly reporting, without comparing the predictive validity of personality and skills.
Can someone who is not good at math do this occupation? Basic mechanical and hydraulic and electrical and measurement and calculation and reading ability is needed; a quantitative foundation can be filled in through training and tool assistance, but being completely unable to adapt to measuring tools and data and principles would be markedly limiting.
Does this occupation require high emotional intelligence? Emotional stability and communication and conflict handling ability are needed, but no specific assessment score is required. Downtime and schedule and rework pressure require self-regulation and reporting according to procedures.
Can the Enneagram be used to judge whether I am suited? No. The Enneagram is a self-exploration tool and does not constitute an occupational ability or fit conclusion; judging fit should look at whether you can complete diagnosis and repair and overhaul and testing work under safety and procedural requirements.
Simulated diagnostic plans, record checks, and anomaly explanations can be observed; this is an editorial exploration suggestion, and there is no evidence that these materials predict fit better than a questionnaire.
Main positions：The person and the work team; safety and equipment management personnel; equipment and personal safety
Possible consequences：Improper handling of high pressure in hydraulic or pneumatic systems causing injection injury or loss of equipment control; failing to relieve pressure and support and test according to procedures
Reduce risk：Relieve pressure and isolate and support according to procedures and use suitable tools and protection; stop immediately and review and report when a pressure or leak anomaly is found
Basis：O*NET 49-3042.00 detailed tasks and work activities · BLS heavy repair occupational group environment
Typical scenarios：Scenario | When short-staffed, being asked to have untrained personnel temporarily take over lifting or jacking or support work.
Main positions：The person and rigging and scaffolding personnel; personal safety; lifting and support operation boundaries
Possible consequences：Improper lifting or jacking or support causing equipment overturning or falling and crushing; rigging or support defects or improper direction
Reduce risk：Work according to lifting and support procedures and check rigging and support and securement; if a lifting or support anomaly is found, evacuate immediately and isolate and report
Basis：O*NET 49-3042.00 detailed tasks and work activities · BLS heavy repair occupational group environment
Typical scenarios：Scenario | Working conditions under equipment or in confined spaces being ignored, and being asked to complete the repair first and deal with ventilation and protection later.
Main positions：The person and safety and occupational health personnel; occupational health and working environment
Possible consequences：Oil and grime and dust and noise and confined spaces causing slips or inhalation or injury and asphyxiation; inadequate ventilation and gas detection and personal protection
Reduce risk：Work according to confined space and ventilation and gas detection and personal protection requirements; if the environment or gas is abnormal, evacuate immediately and report
Basis：O*NET 49-3042.00 detailed tasks and work activities · BLS heavy repair occupational group environment
Typical scenarios：Scenario | Hot work or electrical work permits are not yet complete, and the person is asked to weld or wire first and complete the paperwork later.
Main positions：The person and safety and hot work management personnel; personal safety and fire risk; hot work and electrical boundaries
Possible consequences：Hot work or electrical work mistakes causing fire or electric shock or equipment damage; failing to work according to permit and isolation and voltage verification requirements
Reduce risk：Hot work and electrical work must be carried out according to permit and isolation and voltage verification requirements; if fire or electric shock or equipment anomalies occur, stop immediately and isolate and report
Basis：O*NET 49-3042.00 detailed tasks and work activities · BLS heavy repair occupational group environment
Typical scenarios：Scenario | Diagnosis and test results being marginally nonconforming, and under schedule pressure being asked to deliver first and retest or adjust later.
Main positions：The person and quality control and supervisors; equipment repair quality; fault recurrence boundaries
Possible consequences：Inadequate diagnosis or repair or assembly or adjustment leading to a recurring fault or secondary damage; failing to follow manuals and manufacturer specifications and testing requirements
Reduce risk：Complete diagnosis and repair and overhaul and testing according to manuals and specifications; when nonconformity or recurrence is found, isolate immediately and report and cooperate with rework
Basis：O*NET 49-3042.00 detailed tasks and work activities · BLS heavy repair occupational group environment
Typical scenarios：Scenario | Finding that a piece of equipment's repair and test data do not match the records, and being asked to issue a quality or acceptance conclusion based on the existing records first and revise later.
Main positions：The person and quality control and equipment management personnel; repair quality and responsibility definition; qualification and disclosure boundaries
Possible consequences：Missing or distorted repair and inspection and test and spare parts records making traceability impossible and responsibility undefinable; issuing special equipment inspection or acceptance conclusions beyond scope, or back-filling forged records afterwards
Reduce risk：Record truthfully according to policy and retain original records and the revision trail; strictly prohibit generating unverified content or issuing inspection or acceptance conclusions beyond scope
Basis：O*NET 49-3042.00 detailed tasks and work activities · BLS heavy repair occupational group environment
Qualification boundaries | Receiving vocational training, completing job shadowing and practical work, obtaining education or training certificates, passing safety and skills assessment and welding and lifting and electrical and confined space qualifications, entering occupational health management, and obtaining enterprise position and work authorization are different statuses; the preparation items listed on this page are not equal to authorization and do not automatically bring special equipment inspection or equipment modification or external disclosure authority.
| Career direction | Starting task | Evidence you can prepare | Work you can show even without experience | Difference from this occupation |
|---|---|---|---|---|
| Building construction machinery operators | Construction machinery operation and work assistance | Construction machinery operation training record | A fictitious construction machinery operation points table | It produces equipment operation, while this occupation produces equipment diagnosis and repair and overhaul |
| Surface mining excavating and loading machine and dragline operators | Mining equipment operation and work assistance | Mining equipment operation training record | A fictitious mining equipment operation points table | It produces mining equipment operation, while this occupation produces equipment repair and overhaul |
| Bus and truck mechanics and diesel engine specialists | Vehicle and diesel engine diagnosis and repair assistance | Vehicle and engine repair training record | A fictitious vehicle and engine repair points table | It takes vehicles and engines as the subject matter, while this occupation takes mobile heavy machinery and hydraulic and electrical systems as the subject matter |
| Farm equipment mechanics and service technicians | Farm machinery diagnosis and repair and maintenance assistance | Farm machinery repair training record | A fictitious farm machinery repair and maintenance points table | It takes farm machinery as the subject matter, while this occupation takes construction and mining and logging heavy equipment as the subject matter |
| Crane and tower crane operators | Crane and tower crane lifting operation assistance | Lifting operation training record | A fictitious lifting operation and safety points table | It produces lifting operations, while this occupation produces equipment diagnosis and repair and overhaul |
Whether one can independently disassemble and repair and overhaul key equipment does not depend on education itself, but on whether skills training has been completed and the corresponding qualifications obtained and whether the work is performed within the scope of job authorization.
Education and training only affect the entry starting point; whether one can skillfully complete diagnosis and disassembly and repair and overhaul and testing mainly depends on on-the-job training and mentoring and assessment results.
Matters involving special equipment inspection, accident determinations, or occupational disease diagnosis must be handled by a position or organization holding the corresponding qualifications.
Materials involving customer and manufacturer technical materials and drawings and data must be managed under confidentiality and minimum necessity requirements and must not be sent to unauthorized environments.
A fault repair request and a mobile heavy equipment unit with equipment materials and hydraulic and electrical system descriptions, a repair manual and drawings, and instructions for using lifting and support and measuring tools and levers and hand tools.
A blank diagnosis and repair and test and spare parts record form.
Prepare a diagnosis and repair plan for a fictitious repair request and fill in a repair and inspection record.
Explain the diagnostic steps and tests and safety isolation, the disassembly and repair or replacement and overhaul, the assembly and adjustment and subassemblies, the performance testing and acceptance, and the anomaly and rework contingency plan.
First check the equipment and operating conditions and materials and safety conditions, then determine the diagnosis and disassembly steps according to manuals and procedures.
During execution, record diagnosis and test and repair data, and after completion test and accept and check; clearly mark where information is insufficient and explain why it is not filled in.
This practice is only for testing process understanding and record-keeping ability; all equipment and companies and data are fictitious.
Organize a fictitious diagnosis and repair plan, a repair and inspection record, a test and acceptance record, and a spare parts and anomaly handling explanation into a portfolio, mapping item by item to the diagnosis and disassembly and repair and overhaul and testing and safety and recording abilities in the job requirements.
Give the plan and records to others to review according to manuals and specifications, and check whether diagnosis and repair and testing and acceptance are self-consistent; only if others can review them without reading the explanation does it show the plan and records are handover-ready.
Use one page to explain this equipment's fault — diagnosis — disposition — testing and acceptance — outstanding items, so it is easy to show in an interview or mentoring session how you connect diagnosis with evidence and records.
Explain the readings and errors and calibration status of the diagnostic and testing and measuring and lifting equipment you used, and which judgments depend on experience rather than tools, demonstrating your grasp of the boundaries of data and evidence.
| Stage | Points that may be checked | Observable evidence | Boundary note |
|---|---|---|---|
| Resume and initial screening | Relevant training and safety and equipment repair experience | Skills training records and internship or work experience | Self-assessment cannot replace skills training and qualifications and enterprise verification |
| Interview | Understanding of hydraulic and electrical and diagnosis and safety |
Record the lifting and support and hot work and electrical and confined space safety requirements you observe.
Organize a list of the diagnostic steps and criteria you observed.
Write out the three steps you think are most prone to error and the reasons.
Explain how you would stop and report if there is a hydraulic or electrical or pressure anomaly.
List the basis for determining conformity and the isolation and disposition steps for nonconforming items.
| Qualification or preparation item | Applicable group | Effect on this occupation | Whether it is universally required | Conditions for obtaining it | Approximate investment | Limitation note |
|---|---|---|---|---|---|---|
| Vocational school training or an associate degree or relevant experience | Most positions | Meets the mechanical and hydraulic and electrical and safety knowledge starting point for entry | The typical BLS profile is high school and long-term on-the-job training; the O*NET education required for new hires of 55/30/8 is a different scope and is not a unified threshold in China. |
Typical duties：Under mentoring, become familiar with equipment and diagnosis and testing and on-site safety, and do not independently overhaul key equipment.
Promotion evidence：Diagnosis assistance records and mentoring evaluation; able to restate safety and criteria and reporting points.
Qualification boundaries：Mechanical and hydraulic and electrical basic training record; safety and lifting basic training.
Next steps：Familiarity with diagnosis and testing and criteria and on-site safety points.
Typical duties：Independently complete on-site diagnosis and repair and testing and acceptance according to procedures and record truthfully, and isolate and report according to policy when anomalies are found.
Promotion evidence：Diagnosis and repair and testing and acceptance records and review opinions.
Qualification boundaries：Job authorization and safety and qualifications; field service experience.
Next steps：Accumulate experience under different equipment and site conditions and practice diagnosis and repair and testing methods.
Typical duties：Take on complex equipment and difficult faults and mentoring and fault analysis.
Promotion evidence：Complex diagnosis and anomaly handling records.
Qualification boundaries：Corresponding job authorization and specialty qualifications; complex diagnosis experience.
Next steps：Learn complex equipment and fault and diagnosis and analysis methods.
Typical duties：Coordinate field service and quality and anomalies and rework and external conclusions and sign-off, and guide newcomers.
Promotion evidence：Overall conclusions; field service and traceability documents.
Qualification boundaries：Corresponding management appointment or enterprise authorization.
Next steps：Improve field service and quality and traceability management mechanisms.
Typical duties：Under mentoring, take on disassembly and cleaning and measuring tool assistance, and do not independently overhaul or assemble key assemblies.
Promotion evidence：Disassembly assistance records and mentoring evaluation; able to restate measuring tool and safety points.
Qualification boundaries：Mechanical and measuring tool basic training record; safety training.
Next steps：Familiarity with disassembly and measuring tools and assembly and adjustment points.
Typical duties：Complete disassembly and overhaul and assembly and adjustment and testing according to procedures and record it, and report according to policy when anomalies are found.
Promotion evidence：Overhaul and assembly and testing records and review opinions.
Qualification boundaries：Job authorization and safety and qualifications; overhaul and assembly experience.
Next steps：Accumulate experience under different equipment and assembly conditions and practice overhaul and assembly and testing methods.
Take on complex assembly overhaul and assembly and adjustment and mentoring and process improvement.
Typical duties：Under mentoring, take on organizing and archiving assistance for work orders and diagnosis and repair and spare parts records, and do not independently determine compliance or make external disclosures.
Promotion evidence：Record organizing and checking and archiving assistance records and review opinions.
Qualification boundaries：Information and safety basic training record; safety and confidentiality training.
Next steps：Familiarity with the key points of work order and diagnosis and repair and spare parts and safety and metrology records specifications.
Typical duties：Record diagnosis and repair and testing and spare parts and anomalies truthfully according to policy and hand over, and manage record versions and retention.
Promotion evidence：Diagnosis and repair and testing and spare parts and safety records and review opinions.
Qualification boundaries：Job authorization and safety and qualifications; records and compliance experience.
Next steps：Accumulate experience under different equipment and process conditions and practice recording and traceability and safety methods.
Under mentoring, take on tool and measuring tool preparation and disassembly assistance and cleaning and record assistance; do not independently overhaul key equipment or handle special equipment or issue acceptance conclusions.
Able to independently complete diagnosis and repair and overhaul and assembly and testing and records within the scope of qualifications and job authorization and manuals and procedures, and isolate and report according to policy when there is an anomaly or safety issue or authorization is exceeded.
Able to take on complex equipment and field service and welding and diagnosis and mentoring and fault analysis.
Able to take on team and equipment arrangements and quality and safety and spare parts and cost implementation and evaluation and anomaly sign-off and multi-party coordination.
Wages (median and percentiles, this occupation's own scope)
The median is the midpoint of the distribution and is not equal to the starting wage; differences come from region and industry and equipment and skills and qualifications and duties; the values are this occupation's own scope and do not represent adjacent occupations.
Cannot indicate：OEWS includes production incentive bonuses and excludes benefits, overtime, and non-production bonuses; this page presents them according to this occupation's scope as O*NET does not mark that page as taken from a parent or adjacent occupation; the values are taken from 2025 data, and later updates should be based on a query for the current period.
United States · SOC 49-3042.00 (BLS employment projections, as presented by O*NET)
The precise BLS 49-3042 projection for 2025—2035: about 180,300 → 192,500 people, growth 6.7% (OOH line item about 7%), average annual openings 15,000 including replacements; self-employment in the base period 1.8%. This is not the 49-3040 occupational group's 242,400 people / 20,300 openings, and it is not real-time hiring or AI causality.
Employment size and growth and job openings (this occupation's own scope)
This scope is a projection and is affected by equipment stock and infrastructure and mining and agricultural investment and the supply of technicians; openings consist mainly of replacement needs; the values are this occupation's own scope and are not equal to individual job outcomes.
Cannot indicate：This differs in scope from the BLS OEWS point-in-time employment estimate and the two are not mixed; a projection is not equal to actual hires, and openings are a period annual average scope that cannot be read as net new positions.
Mainland China · National Bureau of Statistics average wages of urban unit employees (industry category scope) and bounded search
Insufficient evidence: public occupational statistics in mainland China have not established a national occupational wage distribution precisely corresponding to O*NET 49-3042.00 (Mobile Heavy Equipment Mechanics); the National Bureau of Statistics publishes average wages of urban unit employees by industry category without distinguishing occupations, and this page does not fill in the gap with industry averages, recruitment offers, or U.S. data.
Occupational wages and employment (statistical scope and gaps)
Mainland China has similar positions in the construction machinery and heavy equipment repair field and their work and specifications are defined by work safety and special operations and occupational health and environmental protection systems, but public statistics do not list a national wage distribution separately for this occupation, and it cannot be inferred from industry averages or recruitment offers.
Cannot indicate：The legal environment and management systems and statistical scope are different, and no combination or conversion is made; the China section of this page only registers the statistical scope and the visible gaps.
These are capability adjacency relationships and do not mean automatic promotion or that no further learning is needed.
Transferable：Mechanical and repair experience
To be supplemented：Vehicle and diesel engine diagnosis and repair abilities need to be supplemented
View occupation detailsTransferable：Farm machinery and mechanical repair experience
To be supplemented：Farm machinery diagnosis and repair and maintenance abilities need to be supplemented
View occupation detailsTransferable：Structural and mechanical repair experience
To be supplemented：Railroad vehicle and braking and structural repair abilities need to be supplemented
View occupation detailsTransferable：Mechanical and electrical repair experience
To be supplemented：Marine machinery and electrical and propulsion system repair abilities need to be supplemented
View occupation detailsTransferable：Equipment operation experience
To be supplemented：Construction machinery operation and construction abilities need to be supplemented
View occupation detailsTransferable：Lifting operation experience
To be supplemented：Crane lifting and signaling and safety abilities need to be supplemented
View occupation detailsTransferable：Diesel and mechanical repair experience
To be supplemented：Diesel equipment and engine diagnosis and repair abilities need to be supplemented
View occupation detailsTransferable：Mining equipment operation experience
To be supplemented：Mining equipment operation and work abilities need to be supplemented
View occupation detailsIn 2025, in the United States this occupation's median hourly wage was $31.50 and median annual wage $65,510 (BLS OEWS, as presented by O*NET, this occupation's own scope); 10th percentile annual wage $46,820, 25th percentile $56,970, 75th percentile $79,270, 90th percentile $94,460; benefits and bonuses are excluded, and the median is not an entry-level starting wage. Mainland China has not established a national occupational wage distribution precisely corresponding to this occupation.
The BLS employment projections presented by O*NET on the 49-3042.00 page show: employment of 188,700 in 2024, 2024—2034 growth of Faster than average (5% to 6%) and marked Bright Outlook, with average annual openings of about 16,500 during the period (including growth and replacements). A projection is not equal to an individual job outcome.
O*NET places this occupation in Job Zone Three (medium preparation required) (6.0 to less than 7.0 (SVP 6.0 to < 7.0)), and the education section shows 55% requiring a post-secondary certificate, 30% a high school diploma or equivalent, and 8% some college courses but no degree (the page does not account for the remaining 7%); this occupation is marked Bright Outlook. In mainland China, positions involving lifting and hot work and electrical and working at height and confined spaces must meet work safety and occupational health requirements and obtain the corresponding qualifications or work permits; the specifics are governed by the requirements of the enterprise and the competent authority.
No. This occupation only needs diagnostic software and repair management systems and spreadsheets and office tools; programming is not an entry requirement for this occupation.
It will not be replaced as a whole. Work orders and readings and spare parts and reports and knowledge retrieval can be assisted by systems, but on-site diagnosis and disassembly and repair and hydraulic and electrical judgment and safety responsibility remain with certified personnel; O*NET shows this occupation's 2024—2034 growth is Faster than average 5% to 6% and marked Bright Outlook, and automation changes the composition of tasks more than it eliminates positions.
The O*NET work context shows: exposure to hazardous equipment and heavy machinery is common, exposure to oil and grime and dust and exhaust is common, working under equipment and in narrow spaces is common, often outdoors and in workshops and exposed to extremely hot or extremely cold temperatures, serious consequences of error (equipment damage and personal injury), and high responsibility for others' health and safety.
Adjacent occupations include building construction machinery operators (47-2073.00), surface mining excavating and loading machine and dragline operators (47-5022.00), bus and truck mechanics and diesel engine specialists (49-3031.00), farm equipment mechanics and service technicians (49-3041.00), crane and tower crane operators (53-7021.00), and so on; a transition requires supplementing the qualifications and responsibility evidence of the new position.
This page uses O*NET 49-3042.00 and U.S. BLS OEWS 2025 and BLS employment projections 2024—2034 as its main sources, and cites ILO and NIST research on occupational exposure and governance; all values are the U.S. this occupation's own scope and do not cover mainland China; for mainland China only the statistical scope and visible gaps are registered; this page does not constitute safety or special operations or quality or legal advice.
Source card | Research process: first check the official scope and tasks and work activities and work context and interest code and Job Zone and certification and training opportunities of U.S. O*NET/SOC 49-3042.00 (Mobile Heavy Equipment Mechanics), then take the BLS OEWS 2025 wages and the employment and growth and openings of the BLS employment projections 2025—2035 (all as presented on the O*NET page, and that page does not mark them as taken from a parent or adjacent occupation, so they are presented according to this occupation's own scope), and register the scope and gaps for mainland China according to the National Bureau of Statistics and work safety and special operations and occupational health and environmental protection systems.
This round, checked on 2026-10-11: O*NET49-3042 tasks 20 items all Core, activities 91/87/85/81/79 and context, RCI100/56/42, Zone3, new-hire education 55/30/8, 7 software categories / 4 hot items / 3 apprenticeship titles; May2025 quintiles, BLS precise 2025—2035 matrix and the 49-3040 group OOH, NBS2025, and Emergency Order 19.
Source card | Source register: the source register on this page lists O*NET 49-3042.00's detailed information and industry distribution and occupational profile and detailed tasks and work activities and work context and software skills and certification directory and detailed interests, as well as BLS OEWS and BLS employment projections and ILO and NIST and related adjacent occupation entries; sources are registered separately by occupational identity and tasks and wages and employment and qualifications and human control purposes.
Usage limitations：Occupational-level description, and it does not cover mainland China's special operations and equipment repair regulations.
Usage limitations：Occupational-level description, and it does not constitute safety or special operations or legal advice.
Usage limitations：This is the occupation's scope as presented by O*NET on the 49-3042.00 page; growth 5% to 6% and marked Bright Outlook.
Usage limitations：O*NET does not mark the wage data on that page as taken from a parent or adjacent occupation; this page presents them according to this occupation's own scope, excluding benefits and bonuses.
Usage limitations：Industry category scope, without distinguishing occupations; not listed separately for this occupation.
Usage limitations：This is an aggregated scope of broad job categories, and no statistical value precisely corresponding to this occupation has been established.
Usage limitations：The original legal text and interpretations by the competent department prevail.
Usage limitations：The regulations and requirements issued by the competent authority prevail.
Usage limitations：The regulations and requirements issued by the competent authority prevail.
Usage limitations：The policies and requirements issued by the competent authority prevail.
Usage limitations：The regulations and requirements issued by the competent authority prevail.
Usage limitations：Task exposure is not equal to automatic disappearance of positions or a specific adoption rate.
Usage limitations：Occupational-level description, not used for individual prediction.
Usage limitations：Not an equipment or special operations or safety or legal standard.
Usage limitations：The original methodology documents prevail.
Usage limitations：A technology mention is not the same as ability or degree of automation.
Usage limitations：Internal scope rules, not an external factual source.
Usage limitations：That page lists certification and qualification search entry points related to this occupation; certificates do not replace the enterprise's and competent authority's qualification and work permit requirements.
Usage limitations：The training search entry point does not replace the enterprise's and competent authority's safety and qualification and work permit requirements.
Usage limitations：Adjacent occupation scope, not equal to this occupation.
Usage limitations：Adjacent occupation scope, not equal to this occupation.
Usage limitations：Database and classification information does not constitute a basis for authorization.
Usage limitations：Used for mapping titles to SOC; does not constitute a basis for qualifications.
Usage limitations：This scope is the U.S. distribution and does not establish a mainland China mapping.
Usage limitations：Occupational-level description; not equal to enterprise safety or quality or legal conclusions.
Usage limitations：Average wages of all employed persons in the industry, not this occupation's median, starting salary, or personal income; non-private and private units are listed separately.
Usage limitations：Do not infer all certificate types from the occupational title; enterprise authorization is checked separately.
Usage limitations：Editorial ratings use the existing occupational responsibilities and AI task analysis on this page. They are not adoption rates, measured effects, job-disappearance or personal-unemployment probabilities, or official scores from Stanford or another external institution. No measured time weights or future robot deployment are assumed.
Precise occupational wages and employment for China, precise industry/regional wages in the United States, AI adoption measured effects and causality, and assessment validity have not been obtained. The four industries are the 49-3040 occupational group background, and the NBS wholesale and retail figure is a category annual average. Shared old facts and protected modules are retained, and full-page synchronization is not claimed.
Big Five (Chinese) · MBTI (Chinese) · Intelligence and Reasoning (Chinese) · Emotional Intelligence (Chinese)
Checklist point notes | This occupation often works in oily and dusty and noisy and confined and outdoor environments, and usually requires training in safety and lifting and support and hot work and electrical and confined space and work permits, and compliance with personal protection and emergency response requirements.
Checklist point notes | U.S. O*NET places 49-3042.00 (Mobile Heavy Equipment Mechanics) in Job Zone Three (medium preparation required), with an SVP range of 6.0 to less than 7.0 (SVP 6.0 to < 7.0); the education section shows 55% requiring a post-secondary certificate, 30% a high school diploma or equivalent, and 8% some college courses but no degree (the page does not account for the remaining 7%); this occupation is marked Bright Outlook; in the United States preparation for this occupation is usually vocational school training or on-the-job experience or an associate degree with one to two years of training.
Checklist point notes | This occupation is mainly repair and operation and inspection and decision making (repairing and maintaining mechanical equipment 88 and operating vehicles 86 and inspecting equipment 85 and making decisions and solving problems 83 are the highest activities; exposure to hazardous equipment and oil and noise and confined spaces is common, consequences of error are serious, and there are downtime and schedule constraints), so the site environment and physical and safety tolerance must be included in the check.
Checklist point notes | The interface relationships with operators and supervisors and projects and suppliers and equipment manufacturers and safety parties determine the boundaries of diagnosis and disposition and acceptance and authorization and responsibility and disclosure, and must be clarified in advance.
Checklist point notes | The traceability and record-keeping requirements for work orders and diagnosis and testing and repair and acceptance and spare parts and anomalies determine quality and responsibility definition, and the specifications for templates and time limits and modification and archiving and authority and retention periods must be clarified in advance (materials involving customer and manufacturer technical materials must also be managed under confidentiality and minimum necessity requirements).
This occupation requires hands-on work in oily and dusty and noisy and confined and outdoor environments, and judging equipment status through measuring tools and diagnostic equipment and symptoms.
The work context shows exposure to hazardous equipment and oil and noise is common, consequences of error are serious, responsibility for others' health and safety is high, and there are downtime and schedule constraints.
The O*NET detailed page lists 7 software skill categories, and the 4 items on the hot technologies page are U.S. 2025 full-year job posting mentions: Office4%, Excel2%, Outlook2%, Word1%; this is not an enterprise adoption rate or AI usage rate, and there is no measured efficiency evidence.
A technology mention is not the same as the degree of automation or a transfer of responsibility.
| Interview performance is not equal to being able to independently overhaul or handle special equipment |
| Job shadowing or probation | Operating according to procedures and recording and collaboration and safety awareness | Job shadowing evaluation and mentor feedback and record compliance | Probation evaluation is not equal to independent work or modification authorization |
|---|
| Conversion to regular status and authorization | Equipment and system and work authorization and qualifications | Job authorization and qualifications and assessment results | Obtaining a position is not the same as obtaining special equipment inspection or acceptance authority |
|---|
Record any disagreement with your mentor on diagnosis or assembly or determination and how it was handled.
Write the review conclusion on one page and use it as the basis for whether to enter the field, rather than judging by interest.
| Several months to several years |
| Education and training are not equal to qualifications or work authorization |
| Safety and skills training and assessment | All positions | Meets safety and lifting and support and hot work and electrical and confined space operation requirements | Generally required for positions involving the corresponding operations | Attend enterprise or institutional safety and skills training and pass the assessment | Several days to several weeks | Training and assessment are not equal to equipment modification or inspection authority |
|---|
| Registered apprenticeship or mentor-based training | Those who want a systematic entry | Systematically master diagnosis and disassembly and repair and overhaul under mentoring | An optional path; the catalog examples do not prove that it is common or universally required. | Join a registered apprenticeship or enterprise mentoring and work under supervision | Several months to several years | Apprenticeship experience is not equal to automatically obtaining a position or work authorization |
|---|
| Welding and lifting and electrical and confined space qualifications | Positions involving the corresponding operations | Meets the statutory or compliance requirements for hot work and lifting and electrical and confined space operations | In China, certification is verified according to the actual catalog trades, equipment, and operations, and not all heavy equipment repair positions require all certificates. | Attend recognized training and assessment and obtain the qualification or work permit | Several days to several weeks | The scope of qualification is governed by the certificate and the competent authority and the work permit |
|---|
| Occupational health examination and protection requirements | Positions involving oil and grime and dust and noise and confined spaces | Meets occupational health and labor protection requirements | Usually required for positions involving the corresponding hazard factors | Those exposed to occupational disease hazards are examined and protected as required; adjustment depends on the hazards and results, and rotation is not a fixed requirement. | Periodic | Examination and protection do not change the operation hazards and safety responsibility |
|---|
| Enterprise position and work authorization | All independent work positions | The prerequisite for obtaining the authority to independently diagnose and repair and overhaul and test | According to the requirements of the enterprise's equipment and safety management systems | Work after passing the assessment and within the scope of the position and work authorization | Depends on position arrangements | Job authorization is not equal to special equipment inspection or acceptance authority |
|---|
Qualification boundaries, third | The preparation items listed on this page are not equal to authorization and do not automatically bring special equipment inspection, equipment modification, or external disclosure authority; real authority is governed by the requirements of the enterprise and the competent authority.
Check by certificate type | China's Emergency Order 19 renews certificates by validity period in 2026; special equipment and other certificate types, permits, and scopes are checked separately, and the old review requirements are not applied uniformly.
Promotion evidence：Complex overhaul and assembly and improvement records.
Qualification boundaries：Corresponding job authorization and specialty qualifications; complex overhaul experience.
Next steps：Learn complex assembly overhaul and assembly and process improvement methods.
Typical duties：Coordinate workshop and overhaul and assembly and quality and safety and sign-off, and guide newcomers.
Promotion evidence：Overall conclusions; workshop and overhaul and quality documents.
Qualification boundaries：Corresponding management appointment or enterprise authorization.
Next steps：Improve workshop and overhaul and assembly and quality management mechanisms.
Typical duties：Take on safety and quality and metrology and data quality and traceability and rectification implementation.
Promotion evidence：Audit and rectification and traceability and audit records.
Qualification boundaries：Corresponding job authorization and specialty training; audit and rectification records.
Next steps：Learn safety and quality and metrology and data quality and audit methods.
Typical duties：Coordinate safety and records and compliance and training and sign-off, handle complex and disputed matters, and guide newcomers.
Promotion evidence：Overall conclusions; safety and compliance and traceability documents.
Qualification boundaries：Corresponding management appointment or enterprise authorization.
Next steps：Improve safety and compliance and records and traceability management mechanisms.
