JLG 450A Service And Maintenance Manual page 101

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