Installation Guide

D4-9 / D4-9X Four-Post Lifts 61 P/N 5900251 — Rev. A— October 2020
Bleeding the Hydraulic Cylinder
The Hydraulic Cylinder on the Lift is self-bleeding, which means that in most cases any air in the
Hydraulic System gets removed automatically simply by using the Lift.
⚠ WARNING Before performing any maintenance on your Lift (for example, bleeding the
Hydraulic Cylinder or adding Hydraulic Fluid), make sure both Runways are on the
ground and the power source has been disconnected and cannot accidentally be
re-connected.
To bleed the Hydraulic System:
1. Raise the Lift to its maximum rise and then lower it all the way back down again.
Pause for at least a full minute between each cycle; the Lift’s motor cannot run continuously.
2. Raise the Lift again to its maximum rise.
If the Lift does
not move erratically, squeak, or jerk as it moves, the Hydraulic System has been
purged of air. You can return the Lift to normal operation.
3. If the Lift
does move erratically, squeak, or jerk as it moves, perform Step 2 again.
When the Lift is raising and lowering smoothly, you can return it to normal operation.
4. Check the Hydraulic Fluid reservoir on the Power Unit; add additional Hydraulic Fluid if necessary.