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
+Run the prestart inspection on CAT 793 haul truck 42, exercise the steering and brakes, record oil and…
Operate and inspect heavy equipment
+Run the prestart inspection on CAT 793 haul truck 42, exercise the steering and brakes, record oil and hydraulic readings, flag any leaks or abnormal sounds, and sign off the inspection sheet before the 06:00 shift handover.
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
+Take truck 42 to bay 3, run a diagnostic walkdown, note fault codes, reproduce the fault under load if safe,…
Diagnose equipment defects
+Take truck 42 to bay 3, run a diagnostic walkdown, note fault codes, reproduce the fault under load if safe, swop sensors as needed, log the findings with probable cause and recommended parts for the parts team.
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
+Remove the worn final drive pinion from excavator 301, install the new pinion, torque to spec, replace seals…
Repair damaged or worn parts
+Remove the worn final drive pinion from excavator 301, install the new pinion, torque to spec, replace seals and lubricant, test for noise and oil pressure, then update the repair record and attach the parts invoice.
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?
Analysing1
Read operating manuals and technical drawings
+Read the depot copy of the hydraulic schematic and engine manual for loader 210, mark the pressure test…
Read operating manuals and technical drawings
+Read the depot copy of the hydraulic schematic and engine manual for loader 210, mark the pressure test points and the specified valve clearances, then produce a one-page checklist for the fitter on morning shift.
The tools that do the workRecordkeepingMicrosoft 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 work16
Adjust and maintain industrial machinery, using control and regulating devices.
+Adjust the hydraulic and electronic regulators on the crusher and conveyor drive so vibration stays within…
Adjust and maintain industrial machinery, using control and regulating devices.
+Adjust the hydraulic and electronic regulators on the crusher and conveyor drive so vibration stays within spec, log the new set points and validation test results, and schedule the next inspection for two weeks.
The tools that do the workMaintenance managementRecordkeepingO*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 excavator gearbox parts by spraying solvent and then immerse the bearings in the parts washer…
Clean parts by spraying them with grease solvent or immersing them in tanks of solvent.
+Degrease the excavator gearbox parts by spraying solvent and then immerse the bearings in the parts washer until clean, inspect for pitting or wear, note replacements needed and update the parts list.
The tools that do the workMaintenance managementRecordkeepingO*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 dump truck's clunk on deceleration: run a road test, isolate transmission, driveline and brake…
Troubleshoot mechanical issues
+Diagnose the dump truck's clunk on deceleration: run a road test, isolate transmission, driveline and brake faults, record fault codes, swap the suspected component for a known-good one if needed, and log findings and corrective actions.
The tools that do the workFleet managementRecordkeepingjob 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
+Move the failed pump and two pallets of spare seals from bay three to maintenance bay one using the forklift,…
Handle and move objects
+Move the failed pump and two pallets of spare seals from bay three to maintenance bay one using the forklift, secure the pump for inspection, note weight and handling issues, and update the inventory movement record.
The tools that do the workFleet managementRecordkeepingjob 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 haul truck axle by comparing the repair estimate, downtime of seven…
Make decisions and solve problems
+Decide whether to repair or replace the haul truck axle by comparing the repair estimate, downtime of seven days, and replacement lead time; authorise the option that minimises cost per operating hour and document the rationale.
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?
Install mining machinery
+Install the new jaw crusher motor assembly on site, align couplings and belts to spec, torque fasteners, run…
Install mining machinery
+Install the new jaw crusher motor assembly on site, align couplings and belts to spec, torque fasteners, run the acceptance test, enter installation notes, test data and serial numbers into the equipment record, and set warranty start date.
Pasted it? Good. When the reply comes back, push once: ask it to sharpen the weakest part. — Did this prompt help?
Maintain mine machinery
+Perform the weekly service on haul truck 793 at Pit North: change engine and hydraulic fluids, inspect…
Maintain mine machinery
+Perform the weekly service on haul truck 793 at Pit North: change engine and hydraulic fluids, inspect suspension and hydraulic lines, replace filters as required, log parts used and labour, and report defects that will delay production to the shift supervisor by Thursday shift end.
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 the post-repair functional test on the shovel’s swing motor after yesterday’s rebuild: bench test at…
Test mine equipment
+Run the post-repair functional test on the shovel’s swing motor after yesterday’s rebuild: bench test at rated torque, verify limit switches and emergency stops, record vibration and temperature readings, and sign off or book further diagnostics before first shift starts tomorrow.
Pasted it? Good. When the reply comes back, push once: ask it to sharpen the weakest part. — Did this prompt help?
Maintain records of mining operations
+Update the mining operations log for the month: enter daily machine hours, downtime reasons, parts consumed…
Maintain records of mining operations
+Update the mining operations log for the month: enter daily machine hours, downtime reasons, parts consumed per unit, and labour hours for Pit South, then reconcile totals against last week’s maintenance budget and circulate the summary to operations and procurement by Friday noon.
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
+Prepare and deliver a one-hour refresher for haul truck operators on pre-start checks: cover tyre and brake…
Train operators in using mine machinery
+Prepare and deliver a one-hour refresher for haul truck operators on pre-start checks: cover tyre and brake inspection, fluid level tolerances, hazard lights, and how to report defects using the site defect card, run it Tuesday morning at 07:30 with a brief competency check afterward.
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 procedures for the 785 loader: include torque specs, lubrication points, scheduled…
Mechanical mine machinery manuals
+Draft updated mechanical procedures for the 785 loader: include torque specs, lubrication points, scheduled intervals, and step-by-step removal and refit of the final drive, then send the revised manual to the engineering lead for approval by next 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
+Send a concise equipment bulletin to supervisors and the control room listing today’s major outages, expected…
Communicate mine equipment information
+Send a concise equipment bulletin to supervisors and the control room listing today’s major outages, expected return-to-service times, parts on order, and any operational restrictions so crews can plan around affected units by the 14:00 shift change.
Pasted it? Good. When the reply comes back, push once: ask it to sharpen the weakest part. — Did this prompt help?
Report mine machinery repairs
+Write the daily repairs report for the Bobcat 325 excavator and Caterpillar 777 haul truck: list faults…
Report mine machinery repairs
+Write the daily repairs report for the Bobcat 325 excavator and Caterpillar 777 haul truck: list faults found, parts replaced with serial numbers, hours out of service, labour hours per mechanic, and a cost total so procurement can order missing items by Friday.
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
+Send the inter‑shift handover summarising current faults, machines on restriction, fuel and coolant top‑ups…
Conduct inter-shift communication
+Send the inter‑shift handover summarising current faults, machines on restriction, fuel and coolant top‑ups done, ongoing repairs with estimated completion, and any safety observations so the night crew lead Sarah can pick up work at 18:00 without delay.
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
+Adjust the engine governor and suspension preload on mobile unit 402 to eliminate the low‑speed surging and…
Adjust mobile mechanical systems
+Adjust the engine governor and suspension preload on mobile unit 402 to eliminate the low‑speed surging and front‑end sag, record the test runs, final settings, and torque readings so the site engineer can approve the change before next shift.
Pasted it? Good. When the reply comes back, push once: ask it to sharpen the weakest part. — Did this prompt help?
Overhaul hydraulic and pneumatic equipment
+Strip, inspect and rebuild the hydraulic pump and pneumatic actuator on loader 19, note worn seals and piston…
Overhaul hydraulic and pneumatic equipment
+Strip, inspect and rebuild the hydraulic pump and pneumatic actuator on loader 19, note worn seals and piston scoring, list replacement part numbers, bench test pressures and leak rates, and file the overhaul record for warranty and compliance review.
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.
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