Product Manual

CO7338.1 20 IN20525 Rev D 3/30/2009
• Motor Hums and Will Not Run
If the motor hums but fails to run, take the following actions:
1. Lift overloaded. Remove excessive weight from lift
WARNING!!
The voltages used in the lift can cause death or injury to personnel. In the following
steps, make sure that a qualified electrician is used to perform maintenance
2. Faulty wiring..….... Call electrician
3. Bad capacitor..….. Call electrician
4. Low voltage........... Call electrician
• Lift Jerks Going Up and Down
1. If the lift jerks while going up and down, it is usually a sign of air in the hydraulic system.
Raise lift all the way to top and return to floor. Repeat 4-6 times. Do not let this overheat
power unit.
• Oil Leaks
Oil leak causes at the power unit and cylinders are normally caused by the following:
1. Power unit: if the power unit leaks hydraulic oil around the tank-mounting flange check
the oil level in the tank. The level should be two inches below the flange of the tank. A
screwdriver can be used as a “dipstick”.
2. Cylinder - Piston Rod: the rod seal of the cylinder is out. Rebuild or replace the cylinder.
3. Cylinder - Vent: the piston seal of the cylinder is out. Rebuild or replace the cylinder.
• Lift makes excessive noise / vibrates
Excessive noise from the lift is normally caused by the following:
1. Cross beam ends are rubbing the columns. Readjustment needed.
2. Cylinder too tight, load lift half capacity and cycle up and down a few times to break in.
3. May have excessive wear on cable sheaves or shafts. Replace them.