10
TROUBLESHOOTING GUIDE
HYD-10-DC
• WARNING: Care should be taken to identify all potential hazards and comply with all applicable safety procedures before
beginning troubleshooting or repairs.
• CAUTION: Before performing any troubleshooting or repairs, the load must be removed from the platform. Then either
raise the platform and install maintenance props or fully lower the platform to the floor.
• Only qualified individuals trained to understand mechanical devices and their associated electrical and hydraulic circuits
should attempt troubleshooting and repair of this equipment.
Consult the factory for problems at time of installation, or for any problems not addressed in this manual.
* Check the charger notes page for troubleshooting other problems specific to battery-powered units.
PROBLEM
Possible Cause
Remedy
Power unit doesn’t run when “UP”
button is pressed.
Motor runs, platform doesn’t move.
Power unit not noisy.
Motor hums or pump squeals, but
the platform does not move, or the
platform moves only slowly.
Platform raises, then drifts down.
Spongy or jerky platform move-
ment.
Platform won’t lower.
Platform lowers too slowly.
Platform lowers too quickly.
Bad motor relay coil.
Battery voltage low.
Pump is failing to build pressure.
See last paragraph, above.
Platform overloaded.
Pressure relief opening at full
pressure.
Contamination holding open the
lowering valve or the check valve.
See last paragraph, above.
Excessive air in the hydraulic
cylinders.
Solenoid coil is bad or connector is
loose.
Physical blockage of the structure.
Solenoid valve screen or suction
hose screen plugged.
Pinched hose.
Velocity fuse locking (platform will
only very slowly creep down).
Flow control stuck.
See last paragraph, above.
Test with meter; replace if bad.
Test with meter; replace if bad.
Check battery voltage with meter.
Consult the factory.
Same as above.
Verify that the load doesn’t exceed
the lift's capacity.
Check for structural damage or
binding of the load rollers, etc.
Check for platform overload
condition.
Remove and inspect.
Same as above.
Bleed air from the cylinder(s).
Check with meter.
Inspect for foreign material or
objects that might block the
platform or its rollers.
Remove and inspect.
Check pressure, supply, and return
hoses for kinks.
Same as for jerky platform
movement.
Pull and inspect the flow control,
clear if necessary.
Same as above.
