JLG 110HX ANSI Service Manual - Manual (Page 132)

SECTION 3 - TROUBLESHOOTING
3-12 – JLG Lift – 3120636
STEERING SYSTEM.
No response to steer control.
Circuit breaker open. Determine and correct cause; reset circuit
breaker.
If equipped, steer/tow selector in "tow" position. Actuate control to "steer" position (Valve knob
in).
Hydraulic system oil low. Replenish oil as necessary.
Hydraulic system pressure too low. Adjust pressure.
Damaged wiring on control switch or solenoid
valve. See proper wiring diagram.
Control switch not functioning properly. Replace switch.
Restricted or broken hydraulic line on valve
bank, hydraulic pump or rotary coupling. (If
equipped.) Clean, repair or replace line.
If equipped, swivel coupling leaking internally.
(Seals defective.) Repair or replace coupling.
Steer control valve not functioning properly. Repair or replace valve.
Steer cylinder not functioning properly. Repair or replace cylinder.
Machine hard to steer or steering is erratic.
Hydraulic system oil low. Replenish oil as necessary.
Restricted hydraulic line or fitting. Clean, repair or replace line or fitting.
Restricted crossover relief valve. Clean or replace valve.
Steer system pressure low. Adjust pressure.
Bent linkage (tie rods). Repair or replace linkage as required.
Hydraulic pump not functioning properly. Repair or replace pump.
Steer cylinder not functioning properly. Repair or replace cylinder.
Steering inoperative.
Circuit breaker open. Determine and correct cause; reset circuit
breaker.
Damaged wiring on control switch or solenoid
valve. See proper wiring diagram.
Solenoid valve not functioning properly. Repair or replace valve.
Control switch not functioning properly. Replace switch.
Table 3-4. Chassis Assembly - Troubleshooting
TROUBLE PROBABLE CAUSE REMEDY