Use and Care Manual

HD-9 Series Four-Post Lifts 65 P/N 5900123 — Rev. M1 — March 2020
Bleeding the Hydraulic Cylinder
The Hydraulic Cylinder on the Lift is self-bleeding, which means that in most cases any air in the
system can be removed by raising and lowering the Runways a few times, “bleeding” the Hydraulic
System of the unwanted air.
⚠ WARNING Before performing any maintenance on your Lift (for example, bleeding the
Hydraulic Cylinder or adding Hydraulic Fluid), make sure the Runways are fully
lowered and the power source has been completely disconnected. If your
organization has Lockout/Tagout policies, make sure to implement them after
connecting to the power source.
Symptoms of air in the Hydraulic System include Runways moving erratically and/or making odd
noises. These could be caused by other situations; refer to Troubleshooting for more information.
To bleed the Hydraulic System:
1. Raise and lower the Runways up to six times;
pause for at least one minute between
each cycle
.
The Lift’s motor cannot run continuously; it is designed for regular use, but not continuous use.
2. Watch the Runways as you raise and lower them.
When the Lift stops moving erratically or stops squeaking, you can stop the bleeding process.
3. Check the Hydraulic Fluid Reservoir on the Power Unit.
Bleeding the Hydraulic System may significantly lower the amount of Hydraulic Fluid in the
reservoir; add more Hydraulic Fluid if necessary.
You can damage your motor by running it without enough Hydraulic Fluid in the reservoir.
If your Lift is still moving erratically or making odd noises after bleeding the Hydraulic System, refer to
Troubleshooting for more information.