JLG 120HX ANSI Service Manual - Manual (Page 93)

SECTION 3 - TROUBLESHOOTING
3120686 – JLG Lift – 3-11
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Table 3-4.Chassis Assembly - Troubleshooting
TROUBLE PROBABLE CAUSE REMEDY
POWER PLANT.
Engine will not start.
Station power selector switch not in required
position. Actuate switch as required.
Circuit breaker open. Determine and correct cause; reset circuit
breaker.
Defective starter motor. Replace starter motor.
Damaged wiring in ignition circuit (broken wire
on starter). Repair, replace wiring.
Ignition switch not functioning properly. Replace switch.
Ignition relay not functioning properly. Replace relay.
Ignition circuit shorted to ground. See proper wiring diagram.
Battery cable(s) not making contact. Clean and tighten cable(s).
Start lockout not working. See wiring diagram. Check relay.
Engine will not start (ignition OK).
No fuel. Replenish fuel as necessary.
Clogged fuel filter. Replace fuel filter.
Choke solenoid malfunction. Replace choke solenoid.
Restricted or broken fuel line. Clean or replace fuel line.
Fuel shut-off valve in carburetor stuck or frozen. Repair or replace fuel shut-off. Check for electri-
cal power.
Battery discharged. Charge battery, replace if defective.
Fuel pump not working. Replace fuel pump.
Cam timing belt jumped time or broken. Repair or replace timing belt.
Ignition timing slipped. Repair timing.
Engine will not accelerate above low.
Damaged wiring on speed control switch or high
engine solenoid. Repair or replace wiring.
Drive controller not functioning properly. Replace controller.
Actuator not functioning properly. Repair or replace solenoid.
Excessive load on engine. Reduce load.