Direct Lift Pro9F - Manual (Page 22)

Pro9F 9000 lbs. Floor Plate Lift IN50019 Rev. C 03/30/2009 22
• 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
Excessive noise from the lift is normally caused by the following:
1. Column of the lift is dry and requires grease.
2. Cylinder pulley assembly or cable pulley assembly is not moving freely.
3. May have excessive wear on pins or cylinder yoke.