top of page

South Florida

JLG Problems: Common Faults and How to Troubleshoot

The JLG problems we see most in the field — fault codes, fault code, codes — what causes each one, and when to stop the machine and call a mobile mechanic.

South Florida

Common JLG Problems and Their Causes

The symptoms owners report most — fault codes, fault code, codes — usually trace back to fuel and air delivery, cooling system condition, hydraulic contamination, worn drive components or wiring faults. Each shows up with distinct signs that narrow the diagnosis quickly, and fault codes on newer machines point to the circuit to test first.

Diesel mechanic performing on-site engine and hydraulic repair on Caterpillar heavy equipment at an active job site.

600+

Service Calls Per Year

282

Reoccurring Clients

South Florida

Troubleshooting Steps That Help

Note when the problem happens (cold start, under load, after running hot), check fluids and filters, look for leaks and chafed harnesses, and write down any codes. Share that with the technician and the repair usually takes one visit instead of two.

JLG Diagnostics

JLG Diagnostics

Platform, ground control and drive faults on the JLG lift diagnosed with manufacturer software.

JLG Won't Raise or Lower

JLG Won't Raise or Lower

Hydraulic, electrical and interlock faults that stop the JLG lift from raising or lowering repaired.

JLG Hydraulic Repair

JLG Hydraulic Repair

Lift, extension, jib and leveling cylinders, pumps and hoses on the JLG lift repaired.

JLG Drive & Steer Repair

JLG Drive & Steer Repair

Drive motors, hubs, steer cylinders and controls on the JLG lift repaired.

JLG Control Box Repair

JLG Control Box Repair

Platform and ground control boxes, joysticks and harnesses on the JLG lift repaired.

JLG Engine Repair

JLG Engine Repair

Diesel or gas engines on the JLG lift repaired, including no-starts and power loss.

JLG Battery & Charger

JLG Battery & Charger

Batteries, chargers and wiring on electric JLG lift units tested and replaced.

JLG Annual Inspection

JLG Annual Inspection

Annual and frequent inspections on the JLG lift documented to keep it in service.

Lift & Extension Cylinders

Cylinder resealing on the JLG lift.

Hydraulic Pump & Valves

Pump and valve repair.

Drive Motors & Hubs

Drive system repair on the JLG lift.

Platform Controls

Joystick and control box repair.

Ground Controls & ECM

Controller and harness repair.

Engine

Diesel and gas engine repair.

Batteries & Charger

Electric drive battery service.

Turntable & Slew Ring

Rotation system repair on the JLG lift.

Leveling & Safety Systems

Tilt sensor and interlock repair.

South Florida

Why Choose Con-Tractor for JLG Repairs

We send a fully equipped service truck and a diesel mechanic who has worked on this equipment for years. Repairs are done on-site in South Florida, with clear quotes before work starts and no shop haul-in required.

We Service

Other Brands

Mobile diesel mechanics specializing in engine, hydraulic, and transmission repairs for heavy equipment across Florida job sites.

CITY

Reach Out?

Need service for your heavy equipment? Our mobile diesel mechanics provide on-site diagnostics, engine repair, hydraulic service, and drivetrain repairs to keep your machines running with minimal downtime.

  • Yes. Our diesel mechanics provide mobile, on-site heavy equipment repair throughout South Florida. We service equipment directly at job sites to reduce downtime and avoid unnecessary transport.

  • We repair a wide range of heavy equipment, including excavators, loaders, backhoes, skid steers, dozers, agricultural machinery, and other diesel-powered equipment used in construction and industrial operations.

  • Response times vary based on location and workload, but our mobile diesel mechanics aim to provide prompt service to diagnose and repair equipment as efficiently as possible.

HAVE

QUESTIONS?

FREQUENTLY ASKED
QUESTIONS

Have more
questions? Call us!

bottom of page