PROPEL SYSTEM TROUBLESHOOTING
QTFSB 98351 04/25/03
4-18
PROBLEM
.
CAUSE
SOLUTION
No propelling
Low battery charge
Charge batteries.
Controller overheated
Thermal switch tripped. Allow cool down period.
Loose or broken wires or
motor failure
Locate, then fix or replace wire(s). Check motor for
binding. Check motor for failure.
Blown fuse (120A)
Replace fuse.
Main contactor failure
Replace main contactor.
Key operated on/off switch
failure
Replace on/off switch.
Chain failure
Repair chain.
Machine moves without
pressing foot pedal
Throttle not set at “neutral“
position
Adjust linkage.
Full speed only
Damaged wires, short
circuits, crossed wires
Check visually for damage. Check controller for dirt
or metal chips causing short circuit.
Machine will not reach
full speed
Batteries run down
Charge batteries.
Contactors close,
machine moves to full
speed but lacks power
Loose connections
Locate and fix or replace wires.
Contactors close, little
power. High pitched
whistle
Controller overheating
Allow controller to cool.
Forward speed only
Contactor failure
Replace contactor.
Reverse speed only
Contactor failure
Replace contactor.
Sporadic operation
Low battery charge
Charge batteries.
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