Spicer TPCS (Tire Pressure Control System) Service Manual - Manual (Page 50)

50
Introduction
The chart below contains typical Tire Pressure Control
System settings. These settings may be changed by
using the Operator Control Panel to program the
system as described in Programming Tire Pressure
Control System in this section.
System Setup
Normal service procedures (removal of valve stem and
installation of air hoses) will cause the tires to be
unevenly under-inflated. This may result in a fault code
on power up. If fault is encountered, press run flat
button to continue.
Note: Inflation times are a function of compressor
capacity. It may be desirable to plumb clean, dry
(125 psi regulated) shop air into the wet tank to per-
form these tests without running the engine; or run
engine at a fast idle to decrease the inflation time.
Note: In low tire pressure conditions (under 40 psi) a
pressure variation of a few pounds is normal. The
displayed pressure will typically indicate the lowest tire
pressure observed.
1. Connect vehicle to (125 psi regulated) shop
compressed air supply if it is available. Select the
Highway Loaded condition. Bringing tires to their
highest pressure mode first is necessary to ensure
proper tire equalization prior to tire deflation.
During system inflation, check each channel
individually for air leaks. Perform any necessary
repairs to system.
Note: System channels are only pressurized when in
the process of inflating a particular channel.
2. During inflation, check all tire hose connections
with soapy water or leak detector. If air leaks are
detected, repair before continuing.
3. Select emergency loaded condition and allow
system time to deflate. When the system is
stabilized, verify actual tire pressure at all wheel
valves and compare to indicated pressure on the
Operator Control Panel.
4. Proceed to off-highway loaded condition and verify
actual tire pressures.
5. Proceed to highway loaded condition and verify tire
pressures.
Note: When repairs to the Pneumatic Controller have
been completed, the servicing technician should assure
proper system function before putting vehicle back in
service. As a minimum, the system should be inflated
using the Operator Control Panel to achieve the high-
way loaded setting, and the deflated until the off-
highway loaded setting is achieved.
Caution: The Spicer Tire Pressure Control
System has the ability to maximize the vehicle’s
equipment and conditions. Replacement of compo-
nents may temporally change to levels lower than
you expect before the system adjusts to the
changes. Therefore, the above procedure is
necessary before returning the vehicle to service.
Un-loaded
40 25 25 5
Steer Drive Trailer Speed
System Setup and Checkout
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