Cause / 502

1. Motor not running to proper RPM. 2. Wrong electric motor. 3. Pressure relief valve set too low. 4. Vehicle heavier than lift rated capacity. 5. Restriction or pipeline too small. 6. Oil valves not working properly. 7. Incorrect oil viscosity. 8. Foreign matter clogging intake screen. 9. Improper positioning of up/down valve system.

Repair / 502

1. Check wiring and voltage. 2. Check specifications. 3. Adapt pressure gauge, check operating pressure with valves closed and with them open, raising vehicle. 4. Weigh vehicle at each axle, check specification. 5. Check pipe size and specifications. 6. Check valves and handle operation. 7. Change to proper oil. 8. Remove intake pipe and clean. 9. Re-set valve stem.