JLG 450A Service And Maintenance Manual page 103

TROUBLE
Travel warning horn inoperative.
Hourmeter inoperative.
Tilt alarm circuit.
High engine speed will not function.
Function speed control will not function.
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Table 3-6.Electrical System - Troubleshooting
PROBABLE CAUSE
INSTRUMENTS AND INDICATORS.
Circuit breaker open.
Damaged wiring in horn circuit.
Damaged horn.
Damaged wiring in hourmeter circuit.
Defective pressure switch.
Inoperative hourmeter.
Damaged wiring in tilt alarm circuit.
Tilt alarm inoperative.
Tilt alarm not adjusted properly.
Defective bulb in tilt light.
Boom above horizontal.
Horizontal limit switch malfunctioning.
Drive controller defective.
High engine solenoid malfunctioning.
Drive pressure switch malfunctioning.
Electrical malfunction.
Defective engine governor.
Boom above horizontal.
Horizontal limit switch malfunctioning.
Defective pump section.
Electrical malfunction.
– JLG Lift –
SECTION 3 - TROUBLESHOOTING
REMEDY
Determine and correct cause; reset circuit
breaker.
Repair or replace wiring.
Replace horn.
Repair or replace wiring.
Replace pressure switch.
Replace hourmeter.
Repair or replace wiring. See proper wiring dia-
gram.
Replace tilt alarm.
Adjust tilt alarm.
Replace bulb.
Lower boom.
Repair or replace limit switch.
Replace controller.
Repair or replace solenoid valve.
Replace pressure switch.
See wiring diagram.
Repair or replace governor.
Lower boom.
Repair or replace limit switch.
Repair or replace pump section.
See correct wiring diagram.
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