JLG 110HX Service Manual - Manual (Page 126)

SECTION 3 - TROUBLESHOOTING
3-10 – JLG Lift – 3120864
REAR FRAME AXLE AREA.
Difficulty encountered when moving
machine.
Load capacity exceeded. Reduce load. Apply loads only in accordance
with load capacity indicator.
Flow divider sticking. Repair or replace flow divider.
Machine being moved up too steep a grade. Remove machine from grade and check that
drive system operates correctly.
Grade too steep. See WARNING Placard on platform for specified
grades and sideslopes.
Towing valve not closed. Close towing valve.
Drive wheel tire treads worn smooth. Replace tires as necessary and inflate to speci-
fied pressure.
Drive brakes "dragging". Re-adjust pressure.
System pressure too low. Re-adjust pressure.
Drive hub(s) defective. Repair or replace hub.
Engine RPM’s not set. Correctly set engine RPM.
Drive motors worn. Repair or replace drive motors.
Counterbalance valve defective. Replace counterbalance valve.
Low amperage on controller. Correctly adjust controller.
DRIVE SYSTEM.
No response to control.
Hydraulic system oil low. Replenish oil as necessary.
Hydraulic pump not functioning properly. Repair or replace pump.
Restricted or broken pump supply line. Clean, repair or replace line.
Restricted or broken line on valve bank. Clean, repair or replace line.
Drive motor(s) not functioning properly. Repair or replace motor(s).
Air in wheel brake circuit. Bleed circuit, determine and correct cause.
Fuse is blow-out on control card. Replace fuse.
Damaged wiring on control switch. Repair or replace wiring.
Control switch not functioning properly. Replace switch.
Brake(s) not releasing. Determine cause and repair or replace.
Table 3-4. Chassis Assembly - Troubleshooting
TROUBLE PROBABLE CAUSE REMEDY