PLATFORM LEAKS DOWN
Run platform to the top and hold the button for 30 seconds to bleed the
system through before determining if there is any leakage.
Does only one side leak down?
• If Yes: Replace cylinder on that one side where it is leaking.
• If both sides leak down: Check lock valve (S4). Lock valve may
have dirt or contamination causing it to leak down. Clean the valve
and reinstall. If it still leaks down replace the lock valve.
THE CIRCUIT BREAKER RESETS
• Check for a direct short in power cable. Inspect for damaged or cut
cable. Also check for improperly size battery cable.
• A defective motor may draw to much current. Check amperage draw
from lift gate motor. At 700 psi the motor should draw 80-100 amps.
• Defective circuit breaker. If the breaker is suspected it should be
replaced.
• Defective circuit breaker. If the breaker is suspected it should be
replaced. This condition can occur also if the platform overloaded (if
it has a load on it)
PUMP MOTOR IS GETTING HOT
• This condition may be normal if the liftgate motor experiences high
cycles of operation in a short period of time without cooling. The
Thermal switch will reset after the motor cools down.
• Check for low voltage. The voltage should be at least 10.5 volts at
the motor solenoid.
• Check batteries are fully charged, load test batteries. Check the
cables for damages, clean dirty connections and tighten any loose
connections
• Thermal switch maybe defective or bypassed. The Thermal sensor
is set to activate at 240 F degrees.
LIFTGATE MAKES A SQUEALING NOISE
• Check the gate for proper lubrication. Inspect the wear pads and
grease points on the platform including hinges and pins.
• Noise happens in both raising and lowering. Check power open hose
guard for interference when the platform moves up and down.
• If the guard is not rubbing add Caterpillar additive. (1U9891 / 4-6
ounces) Engage up switch to by-pass and hold for 30 seconds then
cycle liftgate 4-5 times or until noise stops.
• If the noise only happens when lowering, the pressure comp valve in
the cylinder may be defective or the down pressure may be set too
high. The down pressure should be 500 maximum psi
Troubleshooting Guide
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