Spicer TPCS Troubleshooting Guide - Manual (Page 64)

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Service Procedures
Service Guidelines
The Tire Pressure Control System requires normal mainte-
nance much the same as other systems on the vehicle. Fol-
lowing are some general rules that apply to Tire Pressure
Control System service:
Clean and Dry Air Supply
The Spicer Tire Pressure Control System requires a constant
supply of clean dry air. An adequately sized and properly
maintained air dryer is critical for continued proper operation
of the Tire Pressure Control System. Even though the air dryer
may be working properly, moisture can accumulate in the
supply tank during normal operation due to the increase in air
consumption. It is important to drain the supply tank daily.
Draining the supply tank completely when the truck is not in
use will also help keep moisture under control.
Line Replacement and Routing
When replacing air lines, do not allow kinks, sharp bends or
stretching in order to tighten joints. If any tube or hose seg-
ment does not appear to fit easily, it could mean you are not
using the proper part or that you are not following service
procedures properly. Ensure that replacement lines are the
correct length and size. Be cautious of any contaminants (rub-
ber flash, plastic particles, etc.) getting into the lines when
replacing them.
Each segment of the pneumatic system must be secured to
the vehicle frame or other installed line. After completing
assembly of each segment, use cable ties to anchor the seg-
ment at approximately 18" intervals.
Proper Tire Pressure Control System operation requires
correct air line diameters and lengths for each channel.
Incorrect air line replacement can affect both performance
and operation of the system. Refer to the Tire Pressure Con-
trol System service manual for length and diameter infor-
mation.
Joint Compounds and Fittings
Here are some important "DO's" and "DON'Ts" regarding the
use of thread sealant:
• Do apply a thin coating of PTFE based compound on
male threads of pipe joints, tubing connections, and
other system fittings.
• Don't use any compound on O-ring, compression, or
flare fitting connections. Instead, apply a thin coat of
silicone grease to O-rings and flares.
• Don't use Teflon thread tape anywhere in the air
system. (Teflon tape shreds can become lodged in
valves and cause malfunctions.)
• Do follow manufacturer recommended guidelines
when tightening fittings.
CAUTION