JLG 500RTS ANSI Service Manual - Manual (Page 56)

SECTION 3 - TROUBLESHOOTING
3-6 – JLG Sizzor – 3121103
Machine will not steer left or right
Enable switch not activated Activate enable switch
Function not activated within the 3 seconds after
enable switch was depressed Reactivate enable switch
Enable switch not functioning properly Replace enable switch circuit card
Wiring on controller is damaged Repair or replace wiring
Wiring on solenoid valve is damaged Repair or replace wiring
Coil in solenoid is damaged Replace coil
Bent cylinder rod Repair or replace cylinder
Damaged steer linkage Repair or replace steer linkage
Crossover relief valve stuck Repair or replace crossover relief valve
Pressure setting incorrect Reset pressure setting
Machine wanders; steering not firm
Crossover relief valve set too low or not functioning
properly Reset, repair or replace valve as required
Steer linkages loose Tighten linkage
Steer wheel toe-in not set properly Adjust toe-in for 1/4 inch overall
Spindle bushings badly worn Replace bushings
Spindle bushings to tight Replace bushings
OSCILLATING AXLE (IF EQUIPPED)
Axle will not oscillate
Defective lockout cylinder Repair or replace cylinder
Lockout valve sticking Repair or replace valve
Lack of lubrication on axle pin Lubricate pin
Lockout valve defective Repair or replace valve
Axle will not lock
Air in lockout system Bleed lockout system
Defective lockout valve Repair or replace valve
Defective pressure reducing valve feeding lockout
system Repair or replace valve
Table 3-2. Chassis Troubleshooting
TROUBLE PROBABLE CAUSE REMEDY