Spicer TPCS (Tire Pressure Control System) Service Manual - Manual (Page 40)

40
Preparation
To ensure your safety, perform the following steps
before doing any service that requires removal of tires
and wheels.
1. Block wheels properly.
2. Raise the drive axle and support with jack stands of
adequate capacity.
Warning: Never work under a vehicle supported
only by a jack.
Wheel and Wheel Valve Removal
Note: Figure 25 is a detailed view of the external air line
connections on a rear drive wheel. This filter must be
replaced whenever the tire or wheel valve is serviced.
Note: Perform the following steps with the wheels off
the ground to prevent the tires from losing bead seal.
Important: Mark the alignment of the tire valve
stem to the hub.
Remove wheel valve as follows:
1. Remove the control hose from wheel valve to the
hub. Plug the air outlet in the hub to prevent
contaminants from entering the system.
2. Disconnect the tire hose from the wheel valve tee
and plug or cap with the appropriate fitting.
3. Remove two bolts attaching wheel valve to bracket,
and remove wheel valve.
4. Remove wheels and brake drum if required.
Note: It may be required to back off slack to allow
removal of the brake drum.
Hub, Oil Seal and Air Seal Removal
Note: The brake shoes and drum can now be serviced
in the same manner as standard, non-Tire Pressure
Control System assemblies.
Wheel End Disassembly
Note: The following procedures cover the removal of
one drive axle wheel end. Repeat these steps for each
wheel end for the level of repair needed.
1. Remove the following parts:
• Axle shaft (See Figure 26).
• Jam nuts, spindle washer, and outer bearing
(See Figure 27).
• Wheel hub (See Figure 27).
• Oil Seal (See Figure 28).
• Inner bearing (See Figure 27).
• Air Seal (See Figure 27).
Drive Axle Wheel End
Service
Figure 26 Axle Shaft Removal
OIL AIR
Drive
Axle
Assembly
Axle
Shaft
• Stud Nut
• Lockwasher
• Taper Dowels
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