JLG 150HAX Service Manual - Manual (Page 145)

SECTION 6 - SCHEMATICS
3120817 – JLG Lift – 6-17
System(s) operate erratically.
Sticking or binding valve spools, pistons, rods,
etc. Clean, repair, or replace components as
required.
AUXILIARY HYDRAULIC SYSTEM.
Auxiliary hydraulic pump inoperable.
Circuit breaker open. Determine and correct cause; reset circuit
breaker.
Battery requires charging or will not hold a
charge. Charge or replace battery as required.
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.
Low pilot pressure. Adjust pilot pressure to 250-400 psi (17-28 bar).
Table 6-5.Hydraulic System - Troubleshooting
TROUBLE PROBABLE CAUSE REMEDY