JLG 120HX ANSI Service Manual - Manual (Page 101)

SECTION 3 - TROUBLESHOOTING
3120686 – JLG Lift – 3-19
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