Down on the job site – Help is here — MS · TN · AR

Heavy Equipment Repair and Emergency Assistance

CALL NOW FOR EMERGENCY SERVICE  (901) 258-1528

Diesel Doc provides mobile, on-site heavy equipment diagnostics and mechanical repair across North Mississippi, Greater Memphis, and Eastern Arkansas. Certified heavy-duty mechanics travel directly to construction job sites, quarries, grading projects, industrial facilities, and yards in fully stocked mobile service units. We diagnose and repair diesel engines, high-pressure hydraulic systems, final drives, undercarriages, electrical circuits, and on-board diesel generators without the expense, permitting, and downtime of heavy-haul transport.

Other Services

Job Site Repair Rescues

What Does Diesel Doc’s Heavy Equipment Repair Service Cover?

Diesel Doc covers complete mobile mechanical, hydraulic, powertrain, and structural welding repairs for earthmoving, excavation, and industrial support equipment on location. Mobile response trucks are equipped with high-tonnage jacks, portable hydraulic hose crimpers, OEM diagnostic scanners, heavy-duty pneumatic tooling, and mobile stick/MIG welding rigs to complete complex field repairs where the machine sits.

Advanced Engine Diagnostics & ECM Troubleshooting

Rapid diagnostic scanning for Caterpillar, Komatsu, Cummins, John Deere, Kubota, and Perkins industrial diesel engines to clear derates, emissions fault codes, and sensor errors on-site.

High-Pressure Hydraulic Diagnostics & Repair

Mobile hydraulic hose fabrication, replacement of main hydraulic pumps, cylinder rod repacking, relief valve calibration, and directional spool valve repairs.

Crawler Undercarriage & Track Service

Field replacement of thrown rubber or steel tracks, track tensioner adjustments, recoil spring repairs, bottom roller replacements, and final drive motor servicing.

Heavy Electrical & Starting Systems

Diagnostics for 24V starting systems, high-amperage industrial alternators, weather-sealed wiring harness breaks, lock-out switches, and battery banks.

Fuel Injection & Fuel Delivery Systems

Troubleshooting common rail injection faults, low-pressure lift pumps, fuel water separator contamination, and air-locked industrial fuel lines.

Field Welding, Hardfacing & Structural Fabrication

On-site arc welding to repair cracked excavator booms, stick mounting ears, broken loader bucket cutting edges, dozer push arms, and frame brackets.

Towable & Stationary Industrial Generators

Full mechanical and electrical servicing for job site power generation plants, including prime movers, alternators, and automatic transfer switchgear.

Systems We Repair

What Machine Systems Does Diesel Doc Repair on the Job Site?

Industrial Diesel Engines & Electronic ECM Diagnostics

Diesel Doc performs diagnostic interrogations using OEM software for CAT Electronic Technician (ET), John Deere Service ADVISOR, and Cummins INSITE platforms. Technicians connect directly via industrial diagnostic ports to evaluate injection pressure, analyze CAN-bus communication faults, clear DPF/DEF soot derates, and identify engine no-starts directly in the dirt.

Hydraulic Pumps, Cylinders & High-Pressure Fluid Lines

Hydraulic services restore hydraulic breakout force, implement speed, and pressure integrity to booms, sticks, buckets, and blades. Mechanics fabricate multi-spiral hydraulic hoses on-site (up to 5,000+ PSI), rebuild leaking boom and bucket cylinders, replace blown pilot control lines, and adjust primary relief valves.

Final Drives, Hydrostatic Systems & Track Undercarriages

Undercarriage servicing addresses propulsion loss, track derailment, and mechanical binding on steel and rubber-tracked machines. Technicians rebuild hydraulic track adjusters, replace seized carrier rollers and front idlers, repair drive sprockets, and replace failed dual-displacement hydrostatic travel motors.

24-Volt Heavy Electrical & Power Distribution

Electrical diagnostics isolate charging failures, corroded grounding straps, and blown master relays on severe-duty equipment. We repair 12V and 24V electrical starter systems, replace heavy-duty alternators, trace shorted cab harnesses, and diagnose pilot control solenoid valves.

24-Volt Heavy Electrical & Power Distribution

Electrical diagnostics isolate charging failures, corroded grounding straps, and blown master relays on severe-duty equipment. We repair 12V and 24V electrical starter systems, replace heavy-duty alternators, trace shorted cab harnesses, and diagnose pilot control solenoid valves.

Industrial Fuel Injection & Cold-Start Priming

Fuel services resolve fuel starvation, filter plugging, and fuel injection pressure loss on severe-duty job sites. Technicians change primary fuel/water separator elements, service high-pressure common rail fuel delivery lines, and prime air-locked systems after running dry.

Structural Field Welding, Gouging & Bucket Fabrication

Mobile welding repairs cracked structural steel and reinforces high-wear ground-engaging components directly on-site. Service trucks carry heavy mobile welders and carbon-arc gouging equipment to weld cracked loader arm pins, replace worn bucket teeth and side cutters, and reinforce blade pivot mounts.

Job Site Diesel Generators & Mobile Power Units

Generator repairs keep temporary job site electrical grids, dewatering pumps, and site trailers fully operational. We service Caterpillar, Cummins, Multiquip, Kohler, and Doosan mobile diesel generators, handling fuel starvation, governor hunting, voltage regulation failure, and automatic safety shutdowns.

Brands – Equipment

Heavy Machinery Brands & Equipment Diesel Doc Services

Diesel Doc services all major earthmoving machinery, compact construction equipment, material handlers, and job site power units

Chart of brands and heavy equipment Diesel Doc Services

Breakdowns

Examples of Job Site Equipment Breakdown

A heavy equipment breakdown is any mechanical, hydraulic, or electronic failure that immobilizes a machine or prevents it from safely completing grading, digging, lifting, or loading operations. Diesel Doc dispatches emergency response units for:

Total Hydraulic System Failure

Ruptured high-pressure lines or blown pump seals causing implement drop or complete loss of control.

Diesel Engine No-Start or Shutdown

Starter failures, fuel lift pump failures, ECM derates, or dead battery banks on job sites.

Threw Track or Damaged Undercarriage

Derailment of steel or rubber tracks, seized bottom rollers, or blown track tensioner grease seals.

Severe Engine Overheating

Radiator core plugging from job site dust, blown coolant hoses, or hydraulic cooling fan motor failure.

Structural Metal Fractures

Cracked excavator stick mounts, separated bucket ears, or broken blade pivot pins requiring field welding.

Generator Power Loss

On-site prime power failure halting dewatering operations or construction site electrical feeds.

Emergency Job Site Dispatch vs. Scheduled Project Service

Diesel Doc provides both immediate crisis dispatch for down machines and scheduled project maintenance:

DIESEL DOC HEAVY EQUIPMENT SERVICE MODEL

SCHEDULED PROJECT MAINTENANCE

  • Scheduled around project milestones, weather delays, or shift changes
  • 250/500-hour engine & hydraulic PM
  • Undercarriage wear measurement
  • Hydraulic fluid filtration & analysis
  • Book via PM service line

24/7 EMERGENCY JOB SITE DISPATCH

  • Urgent priority dispatch to active quarries, job sites, and projects
  • Point-of-failure mechanical repair
  • Fast on-site turnaround to prevent crew downtime and project delays
  • Coordinated via Fleet Maintenance Hub

  • Call (901) 258-1528 for Emergency Service

When a machine stops an active crew: 24/7 Emergency Roadside Assistance Service for priority field routing.

WHERE WE WORK

Diesel Doc Mobile Heavy Equipment Service Area

Diesel Doc deploys mobile mechanics across industrial corridors, commercial developments, infrastructure projects, and quarries in North Mississippi, Greater Memphis, and Eastern Arkansas.

Mississippi

North Mississippi

I-55 & I-22 / US-78

Cities

Southaven, Horn Lake, Walls, Hernando, Olive Branch, Coldwater, Senatobia, Holly Springs, Potts Camp, Oxford, New Albany, Batesville

Counties

DeSoto, Marshall, Tate, Tunica, Panola, Lafayette, Union

Tennessee

Greater Memphis

I-40, I-55 & I-240 Loop
I-269 Outer Beltway

Cities

Memphis, Bartlett, Germantown, Collierville, Arlington, Oakland

Counties

Shelby, Tipton, Fayette

Arkansas

West Memphis / Eastern Arkansas

I-40, I-55 & I-555

Cities

West Memphis, Marion, Jonesboro

Counties

Crittenden, Craighead

North Mississippi Corridor

Direct job site dispatch along the Interstate 55 and Interstate 22/US-78 corridors. Serving commercial developments, site-prep projects, and industrial parks in Southaven, Horn Lake, Walls, Hernando, Olive Branch, Coldwater, Senatobia, Holly Springs, Potts Camp, Oxford, New Albany, and Batesville across DeSoto, Marshall, Tate, Tunica, Panola, Lafayette, and Union counties.

Greater Memphis Metropolitan Construction Hub

Rapid field response to earthmoving projects, distribution builds, and logistics infrastructure across Interstate 40, Interstate 55, Interstate 240, Interstate 269, and the Lamar Avenue (US-78) corridor. Serving Memphis, Bartlett, Germantown, Collierville, Arlington, and Oakland within Shelby, Tipton, and Fayette counties.

Eastern Arkansas & West Memphis Industrial & Agricultural Gateway

Serving active development sites, road construction projects, and agricultural operations along Interstate 40, Interstate 55, and the Interstate 555 corridor. Deployments cover West Memphis, Marion, and Jonesboro across Crittenden and Craighead counties.

WHY DIESEL DOC

Why Choose Mobile Roadside Assistance Over Heavy-Duty Towing?

Choosing on-site mobile diesel repair over heavy-duty towing saves commercial operators thousands of dollars in secondary hook fees, eliminates multi-day shop backlogs, and reduces overall asset downtime by up to 75%.

Chart showing Diesel Doc's onsite heavy equipment repair versus using a dealership

Our Certifications

  • DOT Certified

  • ASE Medium-Heavy Truck Certifications (Series T)

  • OEM Certification

  • EPA Certification

Answers to common questions

Frequently Asked Questions

Diesel Doc repairs excavators, wheel loaders, track loaders, bulldozers, backhoes, skid steers, mini-excavators, and diesel-powered job site generators directly on the work site.

Yes. Our service trucks carry hydraulic hose inventory, fittings, and field crimping equipment to build high-pressure hydraulic lines (up to 5,000+ PSI) on location.

Yes. We service both steel and rubber-tracked machinery, repairing seized hydraulic track tensioners, replacing broken track pads or chains, replacing bottom rollers, and remounting derailed tracks.

Our mechanics utilize OEM-level diagnostic software for Caterpillar, John Deere, Komatsu, Cummins, and Kubota engines to scan diagnostic trouble codes, diagnose DPF/DEF emission systems, clear engine derates, and troubleshoot injection timing.

Yes. Our mobile trucks are equipped with heavy stick and MIG welding equipment to repair cracked booms, reinforce excavator sticks, replace worn cutting edges, and reattach bucket ears on the job site.

Yes. We diagnose and repair prime power generators from Multiquip, CAT, Cummins, and Kohler, troubleshooting fuel delivery problems, alternator failures, and automatic shutdown codes.

Yes. We work with independent earthmoving contractors, site development companies, utilities, and commercial equipment rental companies.

We deliver clean off-road or on-road diesel fuel to the site, fill your tanks, replace plugged primary filters, and bleed the fuel system to restart the engine without damaging the injection pump.

Technicians are routed based on proximity from key hubs along I-40, I-55, and I-22. Active project breakdowns receive priority routing, and a real-time ETA is provided at call intake.

Costs are based on travel distance, labor hours, and parts/consumables used. Diesel Doc provides a transparent, upfront estimate before mechanical work begins, eliminating hidden charges.

Broken down at a job site?

Call immediately. A technician will be routed to your job site location.