Spicer TPCS (Tire Pressure Control System) Service Manual - Manual (Page 32)

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Preparation
Warning: Never work under a vehicle supported
only by a jack.
To ensure your safety, perform the following steps before
doing any service that requires removal of tires and
wheels.
1. Properly block wheels.
2. Raise the non-drive axle and support with jack stands
of adequate capacity.
Wheel End Air Line Removal
Note: Figure 19 shows non-drive axle air line connec-
tions. Use the illustration as a reference and remove as
follows:
• Working quickly to minimize air loss, disconnect
tire hose from tire and connect cap.
Wheel Removal
Warning: If the tire being removed is not flat, high
pressure air will be released when the tire hose is
disconnected from the valve stem, use caution and
eye protection.
Important: Note the alignment of the tire valve stem
to the hub and mark if necessary.
1. Disconnect the tire hose from the valve stem.
2. Disconnect the tire hose from the wheel valve.
Note: Store hose assembly in a clean, dry location to
prevent contamination and damage.
3. Cap wheel valve in hubcap to prevent system con-
tamination. Rotate the tire with the hub so that the
valve is on the bottom (protect the wheel valve).
4. Remove the wheel nuts and wheel/tire assembly.
Note: Replace the air filter in the wheel valve when the
tire or wheel valve is serviced.
Caution: Follow the Spicer recommended
procedure for installation of fitting to assure the air
filter is notdamaged by installing the tee fitting too
deeply into the wheel valve (See Figure 18).
A. Lubricate O-ring.
B. Secure lock nut against the O-ring washer.
C. Install the tee into the valve until the O-ring is
seated and the washer is against the face of
the valve.
D. Back off lock nut.
E. Turn tee clockwise to orient fitting – no more than
one turn.
F. Tighten lock nut 16–19 lbs. ft. (22–26 N•m).
Note: Work quickly to minimize air loss during
steps 5-7.
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Non-Drive Axle Wheel End
Service
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Figure 18 Run Tee
Washer
O-ring Valve
5. Remove cap from inner tire hose, install hose on
branch tee. Torque to 16–19 lbs. ft. (22–26 N•m).
6. Remove cap from outer tire, install hose on run
tee. Torque to 16–19 lbs. ft. (22–26 N•m).
7. On single tire only: lubricate O-ring then install tire
hose on wheel valve. Torque to 16–19 lbs. ft.
(22–26 N•m).