Jlg 40H Service Manual User Manual download pdf (Page 125)

SECTION 3 - TROUBLESHOOTING

3120240 – JLG Lift – 3-13

TROUBLE PROBABLE CAUSE REMEDY

Steering inoperative. Circuit breaker open.

Damaged wiring on control switch or solenoid valve.

Solenoid valve not functioning properly.

Control switch not functioning properly.

Relief valve improperly set or not functioning prop-

erly.

Steer cylinder not functioning properly.

Determine and correct cause; reset circuit breaker.

See proper wiring diagram.

Repair or replace valve.

Replace switch.

Reset, repair or replace valves as required.

Repair or replace cylinder.

Machine will not steer left or to the right. Wiring on control switch is damaged.

Wiring on solenoid valve damaged.

Coil in solenoid is damaged.

No oil flow or pressure to steer circuit.

Bent cylinder rod.

Damaged tie rod.

Crossover relief valve sticking.

Cylinder packing defective.

See proper wiring diagram.

Repair or replace wiring.

Replace coil.

Take pressure reading at steer valve and adjust as

necessary.

Repair or replace cylinder.

Replace tie rod.

Repair crossover relief valve.

Repair or replace cylinder.

Machine wanders; steering not firm. Crossover relief valve set too low or not functioning

properly.

Steer linkages loose/spindle bushings worn.

Steer wheel toe-in not set properly.

Swivel coupling leaking.

Reset, repair or replace valves as required.

Tighten linkage/replace bushing.

Adjust toe-in for 1/4 in. (6.35 mm) overall.

Repair or replace swivel coupling.

1 2 ... 120 121 122 123 124 125 126 127 128 129 130 ... 151 152

No comments

Jlg 40H Service Manual User Manual Page 125