What it pays
Government survey numbers — not estimates, not ads.
Half of all Mobile Heavy Equipment Mechanics, Except Engines in the U.S. earn more than $65,510 a year — the middle 80% land between $46,820 and $94,460. About 176,600 people in the U.S. do this work. Figures are for the U.S. occupation group “Mobile Heavy Equipment Mechanics, Except Engines”. (U.S. Bureau of Labor Statistics survey, published 2025.) In India, Craft and related trades workers earn about ₹16,825 a month on average — around ₹2.0 lakh a year (government PLFS survey via ILOSTAT, occupation-family figure).
$65,510typical pay / year
176,600people in this work
$94,460+top 10% earn
₹2.0 lakha year in India (family avg)
Think you get this job?Six quick questions on how it really works — with a hint and the reason behind every answer.
Test yourself →The work, task by task
These are the real jobs-to-be-done, not a wish list. Each task shows where we found it, and the prompt underneath is written for that exact task.
Fixing3
Operate and inspect heavy equipment
+Start the pre-shift heavy gear inspection on the 793 haul truck: complete walkaround checklist, record fluid…
Operate and inspect heavy equipment
+Start the pre-shift heavy gear inspection on the 793 haul truck: complete walkaround checklist, record fluid levels and tyre pressures, run the engine warm-up checks, test hydraulic functions under light load, note any abnormal readings, and sign off if all green by 06:30.
The tools that do the workMaintenance managementRecordkeepingjob descriptionsO*NET
Pasted it? Good. When the reply comes back, push once: ask it to sharpen the weakest part. — Did this prompt help?
Diagnose equipment defects
+Trace the source of the boom oscillation on the 772 excavator: reproduce the fault under controlled lift, log…
Diagnose equipment defects
+Trace the source of the boom oscillation on the 772 excavator: reproduce the fault under controlled lift, log vibration data, strip down the linkage to inspect pins and bushings, swap suspected components with the spare boom, and update the defect report with findings and recommended repair hours.
The tools that do the workFleet managementjob descriptionsO*NET
Pasted it? Good. When the reply comes back, push once: ask it to sharpen the weakest part. — Did this prompt help?
Repair damaged or worn parts
+Repair the worn final drive on haul truck 789: remove the wheel assembly, replace the damaged gear and…
Repair damaged or worn parts
+Repair the worn final drive on haul truck 789: remove the wheel assembly, replace the damaged gear and bearings with parts from bay B3, check shaft runout, refill to spec, torque to chart, test under no‑load and light‑load, then close the work order and attach parts used and labour time.
The tools that do the workMaintenance managementRecordkeepingjob descriptionsO*NET
Pasted it? Good. When the reply comes back, push once: ask it to sharpen the weakest part. — Did this prompt help?
Keeping the record1
Read operating manuals and technical drawings
+Work through the operator manual and technical drawing set for the new jaw crusher: verify service intervals,…
Read operating manuals and technical drawings
+Work through the operator manual and technical drawing set for the new jaw crusher: verify service intervals, note torque specs and hydraulic line routing, mark critical lift points and safety limits, photograph unclear sections, and produce a one‑page safe‑work summary for the crew toolbox talk.
The tools that do the workMicrosoft Wordjob descriptionsO*NET
Pasted it? Good. When the reply comes back, push once: ask it to sharpen the weakest part. — Did this prompt help?
The daily work13
Adjust and maintain industrial machinery, using control and regulating devices.
+Adjust the conveyor drive regulators on the No.3 crusher, set control parameters to maintain 1200 rpm under…
Adjust and maintain industrial machinery, using control and regulating devices.
+Adjust the conveyor drive regulators on the No.3 crusher, set control parameters to maintain 1200 rpm under load, log the changes in the maintenance register, and run a 30-minute load test to confirm stable operation.
The tools that do the workMaintenance managementO*NET
Pasted it? Good. When the reply comes back, push once: ask it to sharpen the weakest part. — Did this prompt help?
Clean parts by spraying them with grease solvent or immersing them in tanks of solvent.
+Degrease the hydraulic pump covers and gearbox housings by spraying solvent, then immerse removable bearings…
Clean parts by spraying them with grease solvent or immersing them in tanks of solvent.
+Degrease the hydraulic pump covers and gearbox housings by spraying solvent, then immerse removable bearings in the solvent tank, inspect for pitting, dry and re-lubricate before returning parts to the No.2 haul truck.
The tools that do the workRecordkeepingO*NET
Pasted it? Good. When the reply comes back, push once: ask it to sharpen the weakest part. — Did this prompt help?
Troubleshoot mechanical issues
+Diagnose the JCB loader vibration by road-testing at idle and full throttle, isolating source to either loose…
Troubleshoot mechanical issues
+Diagnose the JCB loader vibration by road-testing at idle and full throttle, isolating source to either loose coupling, bent shaft, or bearing wear, document fault codes and recommended repairs for the service planner.
The tools that do the workMaintenance managementjob descriptions
Pasted it? Good. When the reply comes back, push once: ask it to sharpen the weakest part. — Did this prompt help?
Handle and move objects
+Lift and position the 600 kg gearbox from stock to the service bay with the overhead hoist, secure on the…
Handle and move objects
+Lift and position the 600 kg gearbox from stock to the service bay with the overhead hoist, secure on the bench, tag orientation and mounting points, then move the old unit to the disposal pallet for return to stores.
The tools that do the workFleet managementjob descriptions
Pasted it? Good. When the reply comes back, push once: ask it to sharpen the weakest part. — Did this prompt help?
Make decisions and solve problems
+Decide whether to repair or replace the worn bearing set on the primary mill by comparing downtime cost for a…
Make decisions and solve problems
+Decide whether to repair or replace the worn bearing set on the primary mill by comparing downtime cost for a six-hour repair versus a 24-hour replacement, consult with operations lead Sarah, then record the chosen action and rationale in the maintenance log.
The tools that do the workRecordkeepingjob descriptions
Pasted it? Good. When the reply comes back, push once: ask it to sharpen the weakest part. — Did this prompt help?
Install mining machinery
+Install the replacement feeder motor at Bay 4, align coupling to shaft tolerances, torque mount bolts to…
Install mining machinery
+Install the replacement feeder motor at Bay 4, align coupling to shaft tolerances, torque mount bolts to spec, wire incoming power to the motor starter, test run under load and update the installation certificate and asset history.
Pasted it? Good. When the reply comes back, push once: ask it to sharpen the weakest part. — Did this prompt help?
Maintain mine machinery
+Service the 785 haul truck and two rock drills this week: complete lubrication, replace the worn hydraulic…
Maintain mine machinery
+Service the 785 haul truck and two rock drills this week: complete lubrication, replace the worn hydraulic hoses on the right boom, test run both units for 2 hours, and update the service log before Friday shift change.
Pasted it? Good. When the reply comes back, push once: ask it to sharpen the weakest part. — Did this prompt help?
Test mine equipment
+Run full functional tests on the conveyor drive and the primary crusher tomorrow morning: record vibration…
Test mine equipment
+Run full functional tests on the conveyor drive and the primary crusher tomorrow morning: record vibration and temperature readings every 15 minutes, isolate any fault codes, and hand the signed test sheet to Shift Supervisor by 14:00.
Pasted it? Good. When the reply comes back, push once: ask it to sharpen the weakest part. — Did this prompt help?
Train operators in using mine machinery
+Run a two-hour hands-on course for the night crew on loader start-up and emergency shutdown, demonstrate the…
Train operators in using mine machinery
+Run a two-hour hands-on course for the night crew on loader start-up and emergency shutdown, demonstrate the daily safety checklist, have each operator complete the checklist under supervision, then file attendance and competency notes after the shift.
Pasted it? Good. When the reply comes back, push once: ask it to sharpen the weakest part. — Did this prompt help?
Mechanical mine machinery manuals
+Draft updated mechanical service manuals for the drill rigs: include the step-by-step hose replacement,…
Mechanical mine machinery manuals
+Draft updated mechanical service manuals for the drill rigs: include the step-by-step hose replacement, torque settings, and safety lockout procedure, then send the draft to Engineering and Safety Officer for review by Wednesday.
Pasted it? Good. When the reply comes back, push once: ask it to sharpen the weakest part. — Did this prompt help?
Communicate mine equipment information
+Prepare a one-page bulletin for site teams detailing the recent gearbox fault trend, required pre-shift…
Communicate mine equipment information
+Prepare a one-page bulletin for site teams detailing the recent gearbox fault trend, required pre-shift checks, and parts on order, then distribute it to Supervisors and pin copies on the noticeboard before first break.
Pasted it? Good. When the reply comes back, push once: ask it to sharpen the weakest part. — Did this prompt help?
Conduct inter-shift communication
+Prepare the inter-shift handover noting current status of drill rig DR-3: coolant topped, belt tension low,…
Conduct inter-shift communication
+Prepare the inter-shift handover noting current status of drill rig DR-3: coolant topped, belt tension low, tyre pressures 82 psi front, pending parts for starter motor — flag safety hold until starter arrives and notify Night Shift Lead Marco and Shift Manager Isabel before 06:30.
Pasted it? Good. When the reply comes back, push once: ask it to sharpen the weakest part. — Did this prompt help?
Adjust mobile mechanical systems
+Log and apply adjustments to the haul truck suspension valve to reduce rear roll on corners, record…
Adjust mobile mechanical systems
+Log and apply adjustments to the haul truck suspension valve to reduce rear roll on corners, record before-and-after ride height, torque settings, custom shim used, test run results at 15 km/h, and update the vehicle maintenance file and operator on completion.
Pasted it? Good. When the reply comes back, push once: ask it to sharpen the weakest part. — Did this prompt help?
Says who?
These are the pages we read to build this. Open any of them and check us.
Activities this job lives in
The human activities behind the tasks — each with its honest AI ceiling.
The logs, files & records this job keeps
Shared with other careers — the same record means something different in each.
Related careers
Same family of work — each with its own tasks and prompts.
The LLOS Work Atlas is the world's largest evidenced task library — a map of human work, with a ready prompt behind every task. 1,774 careers · every task named by the sources that witnessed it — O*NET, ESCO, real job descriptions, Wikipedia — and the deepest tasks by several at once. And it is honest about limits: where AI cannot help, the map says so.
The rest of the map
Same library, five ways in.
Copyright © LLOS.ai · 2026 — original pedagogy, voice, and design — all rights reserved.
Built on public evidence: O*NET®, ESCO, Wikipedia, U.S. Bureau of Labor Statistics, ILOSTAT. All sources & licenses
Built on public evidence: O*NET®, ESCO, Wikipedia, U.S. Bureau of Labor Statistics, ILOSTAT. All sources & licenses