Cause / 710

1. Lift out of plumb. 2. Top of jack is uneven. 3. Uneven floor. 4. Worn arm pins. 5. Worn arm. 6. Bent Arm.

Repair / 710

1. Plumb jacks. 2. Shim or de-bur top of jack. 3. Correct floor. 4. Replace arm pins. 5. Replace arm. 6. Replace arm.