JLG 600aj Repairs
1 repair case documented on this model.
Technical Guides
JLG 600AJ Oscillating Axle Lockout Valve Diagnostics
Troubleshoot lockout manifold, valve controls, and safety limit switch failures on JLG 600AJ oscillating axles.
JLG 600AJ Out-of-Level Alarm and Tilt Sensor Cutout
Educational guide on diagnosing, adjusting, and replacing the dual-axis tilt sensor on a JLG 600AJ articulating boom lift.
JLG 600AJ Charging System Failure and Low Voltage Faults
Technical instructions on resolving charging system failures, alternator output drops, and resulting low-voltage controller faults on JLG 600AJ.
JLG 600AJ Sluggish or Intermittent Boom Elevator Functions
Diagnose intermittent, slow, or non-functional boom lifting, telescoping, and articulating functions on the JLG 600AJ hydraulic system.
JLG 600AJ No Power at Ground Control Console (ADE System Diagnostic)
Diagnostic and repair guide for JLG 600AJ ground control console total power loss and ADE system communication failures.
JLG 600AJ Deutz D2.9 L4 Engine Crank / No-Start Diagnostics
Technical guide to identifying fuel solenoid, electrical relay, and fuel system causes of Deutz D2.9 L4 crank-no-start failures on JLG 600AJ.
JLG 600AJ Front-Wheel Drive Steering Drift or Unresponsive Steering
Tech guide to troubleshooting sluggish steering cylinder response, cross-port bypass, and valve block failure on JLG 600AJ lifts.
JLG 600AJ High-Speed Drive Cutout / Limit Switch Failure
Field tech troubleshooting steps on diagnosing raised-boom drive limits, high-speed drive cutouts, and limit switches on JLG 600AJ.
JLG 600AJ Aux Power Pump and Emergency Descent Failure
Technical field troubleshooting of the 12V DC auxiliary hydraulic power pump and emergency descent systems on JLG 600AJ.
JLG 600AJ Intermittent Platform Communication Loss
Educational guide detailing step-by-step troubleshooting of CAN bus losses, cable track failures, and loose connections on JLG 600AJ boom lifts.
JLG 600AJ Platform Jib Function Non-Responsive Diagnostics
Educational guide on troubleshooting non-functioning platform jib up, down, or swing adjustments on the JLG 600AJ.
JLG 600AJ High Exhaust Backpressure and Deutz EGR Blockage
Tech resource to diagnose high exhaust backpressure, carbon-plugged EGR, and boost sensor failures on Deutz-powered JLG 600AJ.
JLG 600AJ Parking Brake Fail-to-Release Diagnostics
Step-by-step diagnostic guide for parking brake release failure, brake pilot pressure drops, and locking torque issues on JLG 600AJ.
JLG 600AJ Platform Leveling Drift or Level System Failure
Learn to diagnose, adjust, and repair platform automatic self-leveling drift and hydraulic level cylinder failures on the JLG 600AJ.
JLG 600AJ Ground Control Emergency Stop Circuit Malfunction
Technical diagnostic procedures to isolate closed ground E-Stops, platform E-Stops, and open wiring loops on the JLG 600AJ.
JLG 600AJ Deutz D2.9 DPF Active Regeneration Failure and Derate
Technical guide to diagnosing active DPF soot buildup, failed active regeneration, and engine derates on Deutz D2.9 L4 engines in JLG 600AJ.
JLG 600AJ Poor Drive Performance or Weak Torque
Tech resource to diagnose weak hydrostatic drive torque, steering bleed-by, and drive motor failures on JLG 600AJ lifts.
JLG 600AJ Platform Footswitch Interlock Malfunction
Technical guide to step-by-step diagnostic and repair of the platform footswitch interlock switch on JLG 600AJ boom lifts.
JLG 600AJ Ground-to-Platform Engine Control Transfer Malfunction
Technical guide to diagnosing ground-to-platform control selector key switch and function cutouts on the JLG 600AJ articulating boom lift.
JLG 600AJ Platform Load Sensing System (LSS) Calibration and Faults
Technical guide on adjusting, diagnosing, and calibrating the Platform Load Sensing System (LSS) on JLG 600AJ articulating boom lifts.