JLG 150HAX Service Manual User Manual
Page 147
SECTION 6 - SCHEMATICS
3120817
– JLG Lift –
6-19
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 vacuum switch.
Replace vacuum 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 as described in Section 2.
Wheel motor speed circuit.
Switch damaged or inoperative.
Replace switch.
Damaged or disconnected wiring in circuit.
Repair or replace wiring.
P.Q. 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 the safety deadman switch and replace.
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.
Readjust the null of the potentiometer.
Too much ramp in controller.
Adjust ramp as required.
Microswitch in controller bad.
Replace microswitch.
Controller improperly adjusted.
Adjust controller.
Regardless of which way the handle is moved, only one function occurs.
Improper wiring or loose wiring to the solenoids
or potentiometer.
Check all wiring for proper connections.
Printed circuit board failure.
Replace printed circuit board or use a handle
assembly from the circuit that is presently work-
ing to check valve.
Potentiometer needs adjusted.
Adjust potentiometer as required.
Spool stuck in valve bank.
Clean/replace spool.
Table 6-6.Electrical System - Troubleshooting
TROUBLE
PROBABLE CAUSE
REMEDY