JLG 120HX Service Manual User Manual
Page 104
SECTION 3 - TROUBLESHOOTING
3-18
– JLG Lift –
3120819
INSTRUMENTS AND INDICATORS.
Travel warning horn inoperative.
Damaged wiring in horn circuit.
Repair or replace wiring.
Damaged horn.
Replace horn.
Hourmeter inoperative.
Damaged wiring in hourmeter circuit.
Repair or replace wiring.
Defective pressure switch.
Replace pressure switch.
Inoperative hourmeter.
Replace hourmeter.
Hourmeter inoperative.
Damaged wiring in hourmeter circuit.
Repair or replace wiring.
Defective pressure switch.
Replace pressure switch.
Inoperative hourmeter.
Replace hourmeter.
Tilt alarm circuit.
Damaged wiring in tilt alarm circuit.
Repair or replace wiring. See proper wiring dia-
gram.
Tilt alarm inoperative.
Replace tilt alarm.
Tilt alarm not adjusted properly.
Adjust tilt alarm.
Defective bulb in tilt light.
Replace bulb.
Wheel motor speed circuit.
Switch damaged or inoperative.
Replace switch.
Damaged or disconnected wiring in circuit.
Repair or replace wiring.
Defective pump section.
Repair or replace pump section.
Electrical malfunction.
See correct wiring diagram.
PQ HAND CONTROLLER.
Actuation of a function of the valve continues when the handle is in the center position
Improper null of the handle with the control han-
dle safety deadman switch failed.
Check safety deadman switch and replace if nec-
essary. Re-adjust the null of the handle.
Improper null of the handle with the handle safety
deadman switch failed.
Check the safety deadman switch and replace.
Re-adjust the null of the potentiometer.
Too much ramp in controller.
Adjust ramp as needed.
Microswitch in controller bad.
Replace microswitch
Controller improperly adjusted.
Adjust controller.
Table 3-6.Electrical System - Troubleshooting
TROUBLE
PROBABLE CAUSE
REMEDY