Spicer TPCS (Tire Pressure Control System) Service Manual - Manual (Page 47)

47
Air Seal, Wheel Hub and
Oil Seal Installation
Drive Axle Wheel End
Service
• Plug hub air port with a 3 /
8
" pipe plug.
• Open the valve from the air supply line and
stabilize the pressure in the reservoir to
100 ± 5 psig.
• Close air supply valve. Rotate the hub assem-
bly while monitoring the pressure gauge. The
pressure reading should not drop more than
5 psig in 20 seconds.
Note: If the air leakage exceeds the rate listed previ-
ously in step 11, the hub may need to be rotated several
times to insure a complete pressure seal.
12. Install axle shaft as follows:
• Place a new gasket on the hub.
• Install the axle shaft.
• Install axle flange tapered bushings (if
required).
• Install washers and nuts and tighten to specific
torque.
13. Add two pints of lube to hub at “OIL” fill hole. Do
not lube wheel ends by tilting axle.
14. Install oil fill plug in “OIL” hole on hub and tighten
to 20-30 lbs. ft. (27-40.6 N•m).
Caution: Never tighten the inner nut for align-
ment. This will preload the bearing and cause
premature failure.
8. Install the outer nut on the spindle and torque as
follows:
• Dowel-type washer lock – 300 lbs. ft.
(408 N•m)
• Tang-type washer lock – 250 lbs. ft. (229 N•m)
Note: This adjustment procedure allows the wheel to
rotate freely with 0.001" to 0.005" (0.025 mm to
0.125 mm) end-play.
9. Measure end-play using a dial indicator with a
0.001" resolution.
10. Repeat wheel bearing adjustment procedure if end-
play is not within specification.
• Disassemble and inspect the components.
Replace defective parts and re-assemble.
11. Perform an air pressure check (before oil fill) as
follows (see Figure 36):
• Connect the hose from the 40 in 3 pressure
reservoir (2" ID x 12" long with 2' max 3 /
8
"
hose) to the inlet tube via the male #6
37° flare.
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