JLG 45e ANSI Service Manual - Manual (Page 87)

SECTION 3 - TROUBLESHOOTING
3120743 – JLG Lift – 3-11
Machine will speed up in forward or reverse.
Wires loose or broken from Tach Drive System to
Sevcon controller. Check flash code on sevcon. Repair or replace
wire as necessary.
Tach drive shaft broken off. replace tach drive shaft.
Tach drive defective. Check flash code.
No response to steercontrol.
Hydraulic s ystem oil low. Replenish oil as necessary.
Hydraulic system pressure to low. Adjust pressure.
Damaged wiring on control switch or solenoid. See proper wiring diagram.
Control switch not operating properly. Replace switch.
Restricted or broken hydraulicline on valve bank
or hydraulic pump. Clean, repair or replace line.
Steer control valve not functioning properly. Repair or replace valve.
Steer cylinder not functioning properly. Repair or replace cylinder.
Machine hard to steer or steering is erratic.
Hydraulic s ystem oil low. Replenish oil as necessary.
Restricted hydraulic line or fitting. Clean, repair or replace line or fitting.
Restricted crossover relief valve. Clean or replace valve.
Steer system pressure low. Adjust pressure.
Bent linkage (tie rods). Repair or replace linkage as required.
Hydraulic pump not functioning properly. Repair or replace pump.
Steer cylinder not functioning properly. Repair or replace cylinder.
Steering inoperative.
Damaged wiring on control switch or solenoid
valve See proper wiring diagram.
Solenoid valve not function properly. Repair or replace valve.
Control switch not functioning properly. Replace switch.
Relief valve improperly set or not functioning
properly. Reset, repair or repolace valves as required.
Steer cylinder not functioning properly. Repair or replace cylinder.
Table 3-4.Chassis Assembly - Troubleshooting