JLG 3969electric ANSI Service Manual - Manual (Page 35)

SECTION 3 - TROUBLESHOOTING
3120768 – JLGSizzor –
3-5
STEER SYSTEM
No response to control Enable switch not activated Activate enable switch
Function not activated within 3 seconds after
Enable switch was depressed Reactivate enable switch
Enable switch not functioning properly Replace enable switch circuit card
Hydraulic system low Replenish oil as necessary
Damaged wiring on control switch or solenoid
valve Repair or replace wiring as necessary
Control switch not functioning properly Replace switch
Resrticted or broken hydraulic line on steer valve
or hydraulic pump Clean repair or replace hydraulic line
Control valve not functioning properly Repair or replace control valve
Steer cylinder not functioning properly Repair or replace steer cylinder
Machine hard to steer or steering erratic Hydraulic system oil low Replenish oil as necessary
Restricted hydraulic line or fitting Clean repair or replace hydraulic line or fitting
Bent steering linkage Repair or replace steering linkage as required
Hydraulic pump not functioning properly Repair or replace hydraulic pump
Steer cylinder not functioning properly Repair or replace steer cylinder
Steering inoperative Wiring damaged on control switch or solenoid
valve Repair or replace wiring
Solenoid valve not functioning properly Repair or replace solenoid valve
Steer control switch not functioning properly Replace steer control switch
Steer cylinder not functioning properly Repair or replace steer cylinder
Machine will not steer left or right Enable switch not activated Activate enable switch
Function not activated within 3 seconds after
enable switch was depressed Reactivate enable switch
Enable switch not functioning properly Replace enable switch circuit card
Wiring on steer control switch damaged Repair or replace wiring as necessary
Wiring on steer solenoid valve damaged Repair or replace wiring as necessary
Steer solenoid coil damaged Replace coil
Bent steer cylinder rod Repair or replace cylinder
Damaged steer linkage Repair or replace steer linkage
Table 3-2. Chassis Troubleshooting
TROUBLE PROBABLE CAUSE REMEDY