WALTCO WDV - Slow Raise: Motor Runs; Platform Lowers During Up Command; Slow Lowering Issues

PLATFORM DOES NOT RAISE OR RAISES SLOW- MOTOR RUNS
• Check and inspect the oil level in the reservoir. Check the fluid viscosity.
See Checking the oil level in the reservoir
• Check the battery(s) for full state of charge. Replace any batteries that
cannot be fully charged.
• Check for voltage at the motor solenoid. If you have at least 10.5 volts at
the solenoid when the switch is activated and you have no power to the
motor then replace the motor solenoid. Check the pump motor for battery
voltage. Confirm by checking voltage on the motor post. If the motor does
not run after confirming battery voltage at the terminal on the motor,
replace the defective motor.
• Check for any mechanical obstructions or any mechanical damage. Look
for any broken or bent parts that could interfere with normal operation.
Look at the runners, columns and wear pads.
• Check voltage on (S4) valve while the up button is activated. Check for
10.5 volts at the coil. Test the coil (4.5ohms) Confirm that the valve is
magnetizing. If the coil is working the valve may need to be replaced. If
the valve is not getting voltage, check all cables and wires for shorts and
poor connections.
• Check the pressure at the gauge. It should 600-1000psi to raise an empty
platform.
PLATFORM GOES DOWN WHEN THE UP BUTTON IS PRESSED-
MOTOR RUNS
• Check and inspect the hose connections. The hoses could potentially be
reversed where they connect to the power unit box.
• Check (S3) valve for mechanical binding or possible short. (S3) may be
getting power when it should not be getting power
PLATFORM DOES NOT LOWER OR LOWERS SLOW
• Check and inspect the oil level in the reservoir. Check the fluid viscosity.
See owner’s manual for substitute oils.
• Check the battery(s) for a full state of charge. Load test the lift gate
battery(s). Replace any batteries that cannot be fully charged.
• On a power down unit, check for voltage at the pump motor. The voltage
should be at least 10.5 volts.
• Check for mechanical binding. Check the underside of the bed extension
for binding. Check for obstructions in the path of travel.
• Check voltage on (S4) & (S3) valve while the switch is activated. The
voltage should be at least 10.5 volts. Feel for a pulse on the valve. Test
the coil (4.5ohms). Confirm that the valve is magnetizing. If the coil is
good the valve may need to be replaced. If the coils are not getting power,
check all cables and wires for shorts and poor connections.
• Check the pressure compensating valve. It’s located on the passenger
side cylinder at the top. Inspect the valve for restrictions or contaminants.
Troubleshooting Guide
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