22
Troubleshooting
Problem
Cause
Solution
Forks will not raise
(Pump will not run)
No electrical power
Charge batteries
Check fuses
Check wiring and connections
Forks will not raise
(pump running)
Load too heavy - relief valve operating
Hydraulic oil level low
Raise solenoid valve will not close
Lower solenoid valve held open
Reduce load
Add oil to hydraulic reservoir
Clean/repair/replace valve
Clean/repair/replace valve
Forks will not remain elevated
Lower solenoid valve held open
Check valve held open
Clean/repair/replace valve
Clean/repair/replace valve
Forks will not lower
Fork carriage obstruction
Lower solenoid valve malfunction
Faulty switch or wiring
Broken constant force spring
Obstruction in fl ow limiting valve
Non standard or damaged pallet
Remove obstruction
Clean/repair/replace valve
Replace switch and/or check wiring
Replace spring
Clean/repair/replace valve
Replace pallet
Outriggers will not deploy
Outrigger obstruction
Faulty outrigger actuator
Non standard or damaged pallet
Remove obstruction
Replace actuator
Replace pallet
Outriggers will not retract
Outrigger obstruction
Faulty outrigger actuator
Defective batteries
Remove obstruction
Replace actuator
Replace batteries
Batteries will not charge
Blown charger fuse
Loose or corroded connection
Replace fuse
Check/repair connections
Chart 6 Troubleshooting
Replacement Parts
Bishamon has carefully selected the components used in the manufacture of the UniLift. In the event replacement parts are required, ALWAYS
use genuine UniLift components provided by Bishamon. These parts can be obtained from your local Bishamon dealer or by contacting Bishamon
Industries Corporation
For detailed exploded views and parts lists contact your local Bishamon dealer, Bishamon Industries Corporation or visit www.bishamon.com.
