Electric forklift won't move: seat switch, battery and contactor
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Applies to: Caterpillar EP40-EP55 and other electric forklifts
Symptoms
- Power on but no drive
- Fault code on the display
- Lift works but travel doesn't
Why it happens
Travel is locked out unless the seat switch, direction lever and brake signals are right. A low or failed battery cell, a pitted line contactor or a controller fault also stop drive.
How to fix it
- Read the fault code and look it up in the manual.
- Check battery state of charge and connector condition.
- Test the seat switch and direction switch.
- Check the main contactor tips and coil.
Tools and parts
- Multimeter
- Battery hydrometer
- Contactor tips
What the factory service manual covers
Electrical: fault codes, controller tests, contactor service, wiring diagrams. The full procedure, specs and wiring diagrams are in the factory service manual for your machine.