HD-14T Four Post Lift
36
P/N 5900037 — Rev. F — February 2022
Working with Compression Fittings and Tubing
Your Lift comes with a roll of ¼ inch, black, polyethylene Tubing (also called Poly-Flo® Tubing) that is
used with Compression Fittings in two ways: for the Return Line and for the Air Lines.
Important:
While both lines use Tubing and Compression Fittings, the Return Line and Air Lines
are used for completely separate purposes; do not connect the two together.
Note:
Compression Fittings are different from Hydraulic Fittings. This section covers Compression
Fittings only.
The components involved with Compression Fittings include:
•
¼ inch, black, polyethylene Tubing
. You use a single piece of Tubing for the Return Line.
The Air Lines require multiple Tubing pieces. Create the Tubing pieces for both the Return Line and
the Air Lines by cutting lengths from the long roll of Tubing supplied with your Lift.
•
Elbow Compression Fittings
. The Hydraulic Cylinder uses an Elbow Compression Fitting and
then one Elbow Compression Fitting goes on the Power Unit.
•
Tee Compression Fittings
. The Air Line segments require three Tee Compression Fittings.
•
Nuts, Ferrules, Rods, and Threads
. Each connector on Elbow and Tee Compression
Fittings have a Nut, Ferrule, Rod, and Threads (see drawing below). The Nut holds the Tubing and
Fitting together. The Ferrule compresses when you tighten the Nut on the Threads to make a
secure connection. The Rod goes inside the Tubing so that nothing leaks out.
The following drawing shows the components of a connector on a Tee Compression Fitting.
Important
:
Ferrules can only be tightened once
. When you tighten the Nut on the Threads,
the Ferrule gets compressed; it literally changes shape and
cannot
be used again.
To connect Tubing to a Compression Fitting:
1.
Push the Tubing through the Nut and over the Rod.
Do not push hard; you only need the Tubing to go a little way over the Rod. You cannot see the
Ferrule at this point, but the Tubing must go through the Ferrule and over the Rod.
2.
Slide the Nut on the Tubing
away from the Fitting
; if the Nut is still on the Threads, unscrew it
from the Threads and then slide it away from the Fitting. See the drawing above.
3.
Slide the Ferrule over the Tubing, away from the Fitting and towards the Nut.
4.
With the Nut and the Ferrule out of the way, push the Tubing further over the Rod until it stops.
5.
Slide the Ferrule and the Nut back to the Threads on the Fitting.
The Ferrule goes around the Rod and under the Threads. The Nut goes onto the Threads.
6.
Tighten the Nut.
Remember that the Ferrule can only be used once; do not tighten the Nut until everything is ready.
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