Installation Guide

D4-9 / D4-9X Four-Post Lifts 39 P/N 5900251 — Rev. A— October 2020
Installing the 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 Tubing with Elbow Compression Fittings on each
end (FTG ELB -04 COMP x -06 NPT).
Drawing not to scale. Some components exaggerated for clarity.
To install the Return Line:
1. Measure from the Return Line port on the Cylinder to the Return Line port on the Power Unit, then
cut a piece of tubing of the appropriate length.
It is better to make the Tubing piece a little too long rather than a little too short.
2. Route the Tubing through the Flex Tube.
3. Locate the Return Line port on the Power Unit and remove the Shipping Plug.
The Return Line Port is commonly labeled either T1/T2 or CV1/CV2.
4. Connect the NPT connector of the Elbow Compression Fitting to the Power Unit, then connect the
other end of the Elbow Fitting to the Return Line coming out of the Flex Tube.
Refer to Working with Compression Fittings and Tubing for instructions.
5. Remove the Shipping Plug from the Return Line port on the Hydraulic Cylinder.
6. Connect the NPT connector of the second Elbow Compression Fitting to the Return Line port, then
connect the other end of the Fitting to the Return Line.