Cause / 401

1. Piston not plumb. 2. Piston wobble due to bearing wear. 3. The stroke on one jack is off. Or one jack installed higher than the other. 4. Equalizer vertical beam shorter on one side. 5. Bent or broken equalizer. 6. Equalizer rollers or slides not adjusted properly. 7. See trouble shooting on inground Hydraulic lifts.

Repair / 401

1. Check plumbness and correct. 2. Install proper bearing kit. 3. Shim between equalizer and superstructure of the jack that tops out first until both jacks top out and lower the same. 4. Same as #3. 5. Replace equalizer. 6. Adjust rollers or sliders to proper clearance.