JLG 450AJ Service Manual - Manual (Page 99)

SECTION 3 - TROUBLESHOOTING
3120869 – JLG Lift – 3-17
Damaged wiring on control switch or auxiliary
pump. See proper wiring diagram.
Control switch not functioning properly. Replace switch.
Restricted or broken hydraulic line or fitting. Clean, repair or replace line or fitting.
Pump motor solenoid not functioning properly. Replace solenoid.
Pump motor not functioning properly. Repair or replace motor.
Table 3-5.Hydraulic System - Troubleshooting
TROUBLE PROBABLE CAUSE REMEDY