JLG 450A Service And Maintenance Manual page 93

.
TROUBLE
Engine will not start.
Engine will not start (ignition OK).
Engine will not accelerate above low.
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Table 3-4.Chassis Assembly - Troubleshooting
PROBABLE CAUSE
POWER PLANT.
Station power selector switch not in required
position.
Circuit breaker open.
Defective starter motor.
Damaged wiring in ignition circuit (broken wire
on starter).
Ignition switch not functioning properly.
Ignition relay not functioning properly.
Ignition circuit shorted to ground.
Battery cable(s) not making contact.
Start lockout not working.
No fuel.
Clogged fuel filter.
Choke solenoid malfunction.
Restricted or broken fuel line.
Fuel shut-off valve in carburetor stuck or frozen.
Battery discharged.
Fuel pump not working.
Cam timing belt jumped time or broken.
Ignition timing slipped.
Damaged wiring on speed control switch or high
engine solenoid.
Drive controller not functioning properly.
Actuator not functioning properly.
Excessive load on engine.
– JLG Lift –
SECTION 3 - TROUBLESHOOTING
REMEDY
Actuate switch as required.
Determine and correct cause; reset circuit
breaker.
Replace starter motor.
Repair, replace wiring.
Replace switch.
Replace relay.
See proper wiring diagram.
Clean and tighten cable(s).
See wiring diagram. Check relay.
Replenish fuel as necessary.
Replace fuel filter.
Replace choke solenoid.
Clean or replace fuel line.
Repair or replace fuel shut-off. Check for electri-
cal power.
Charge battery, replace if defective.
Replace fuel pump.
Repair or replace timing belt.
Repair timing.
Repair or replace wiring.
Replace controller.
Repair or replace solenoid.
Reduce load.
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