HD-973P Series Multi-Level Parking Lift 44 P/N 5900076 — Rev. B3 — January 2024
Installing the Return Lines
Each Platform has its own Return Line; the Return Line takes excess Hydraulic Fluid coming out of the
Hydraulic Cylinder and sends it back into the Fluid Reservoir on the Power Unit.
The Return Line is a single piece of ¼ inch, black, polyethylene Tubing with Elbow Compression
Fittings on each end. You need to cut off a piece of the supplied Tubing of the right length to create
the Return Line for each Platform.
Important: The Return Line uses the same ¼ inch, black, polyethylene Tubing as the Air Lines. Be
sure not to confuse the two; the Return Line and the Air Lines do completely
different things and must be kept separate from each other.
The following drawing shows where the Return Line connects on the Lift.
Drawing not to scale. Some components not shown or exaggerated for clarity.
Measure the distance from the Return Line connector on the Hydraulic Cylinder to the Hydraulic
Return Port on the Power Unit.
Important: When measuring for the Upper Platform, make sure to cut the
Return Line long enough so it will not pull taut when the Platform is raised.
Cut a piece of Tubing to the measured length from the roll of Tubing that comes with the Lift.
It is better to cut the Tubing a little too long rather than a little too short.
Route the Tubing from the Hydraulic Cylinder through the Flex Tube opening, and out next to
where the Power Unit will be installed.
Let the Tubing hang out of the opening for now.
Remove the Shipping Plug from the Return Line Connector on the Hydraulic Cylinder.
Connect and tighten the Elbow Compression Fitting to the Hydraulic Cylinder.
Connect one end of the Return Line to the Elbow Compression Fitting you just installed.
Refer to Working with Compression Fittings and Tubing for instructions.
Leave the Power Unit end of the Return Line hanging out of the Flex Tube opening for now.
It will be connected to a Tee Fitting and then to the Power Unit later in the installation.
Repeat Steps 1through 8 for the other Platform.
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