VMAC - Vehicle Mounted Air Compressors
VMAC Technical Support: 888-241-2289
VMAC Knowledge Base: kb.vmacair.com
56
Inspecting and Replacing the PTFE Tubes and Push-To-
Connect Fittings
Read the “Maintenance and Repair Safety” section prior to
performing any work on the system (beginning on page 47).
Wear appropriate Personal Protective Equipment and follow all
industry standard safety practices.
The scavenge, pressure control and throttle control tubes are made of
Polytetrafluoroethylene (PTFE) and are within specification to work with VMAC
compressor oil and to withstand the high pressure and operating temperatures
generated by the compressor. Standard air brake hose is not a suitable
replacement.
☐
PTFE tubing should only be cut using proper tubing cutters. Side cutters, utility
knives, etc. will deform the tube, preventing a proper seal (or leave sharp edges
which cut the internal O-ring).
☐
When applying loom to the PTFE tube, leave approximately 1 in between the
loom and the fitting.
☐
Ensure the tube is clean, cut at 90° and that there are not sharp edges.
☐
Lubricate the tube and firmly push it into the fitting so that the tube fully seats
in the fitting.
☐
Slide the collet out, away from the body of the fitting to lock the tubing in place.
☐
Ensure the tube does not have any “play” to prevent the O-ring from wearing.
Cut the tube squarely, using only
proper tubing cutters as side cutters
will deform the tube.
Slide the collet out once
the tube is fully inserted
Figure 32 — Push-to-connect fittings
O-ring
