JLG 25RTS Service & Maintenance page 70

SECTION 3 - TROUBLESHOOTING
TROUBLE
Machine will not steer left or right
Machine wanders; steering not firm
Axle will not oscillate
Axle will not lock
3-6
Table 3-2. Chassis Troubleshooting
PROBABLE CAUSE
Enable switch not activated
Function not activated within the 3 seconds after
enable switch was depressed
Enable switch not functioning properly
Wiring on controller is damaged
Wiring on solenoid valve is damaged
Coil in solenoid is damaged
Bent cylinder rod
Damaged steer linkage
Crossover relief valve stuck
Pressure setting incorrect
Crossover relief valve set too low or not functioning
properly
Steer linkages loose
Steer wheel toe-in not set properly
Spindle bushings badly worn
Spindle bushings to tight
OSCILLATING AXLE (IF EQUIPPED)
Defective lockout cylinder
Lockout valve sticking
Lack of lubrication on axle pin
Lockout valve defective
Air in lockout system
Defective lockout valve
Defective pressure reducing valve feeding lockout
system
– JLG Sizzor –
REMEDY
Activate enable switch
Reactivate enable switch
Replace enable switch circuit card
Repair or replace wiring
Repair or replace wiring
Replace coil
Repair or replace cylinder
Repair or replace steer linkage
Repair or replace crossover relief valve
Reset pressure setting
Reset, repair or replace valve as required
Tighten linkage
Adjust toe-in for 1/4 inch overall
Replace bushings
Replace bushings
Repair or replace cylinder
Repair or replace valve
Lubricate pin
Repair or replace valve
Bleed lockout system
Repair or replace valve
Repair or replace valve
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