Chevrolet Light Duty Truck 1973 Service Manual page 258

4 - 3 4 REAR SU S PEN SIO N AND DRIVELINE
REMOVAL
rig. 75—Wheel Bolt Replacement
Installation of Hub and. Drum Assembly
1. Using a high melting point EP bearing lubricant,
liberally pack bearings and apply a light coat on
I.D. of hub bearing contact surface and O.D. of
axle housing tube.
2. Make sure inner bearing, oil seal, axle housing oil
deflector, and inner bearing race and oil seal are
properly positioned.
3. Install hub and drum assembly on axle housing,
exercising care so as not to damage oil seal or
dislocate other internal components.
4. On the 12-1/4" axles, place outer bearing cone and
roller assembly on axle housing and press firmly
into hub with hand.
5. On 10-1/2" axles, install thrust washer so that tang
on I.D. of washer is in keyway on axle housing.
. Install adjusting nut and complete the installation
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as directed under "Bearing Adjustment."
BEARING ADJUSTMENT
Before checking bearing adjustment, make sure brakes
are fully released and do not drag.
Check bearing play by grasping tire at top and pulling
back and forth, or by using a pry bar under tire. If
bearings are properly adjusted, movement of brake
drum in relation to brake flange plate will be barely
noticeable and wheel will turn freely. If movement is
excessive, adjust bearing as follows:
1. Remove axle shaft and raise vehicle until wheel is
free to rotate.
2. Disengage tang of retainer from locknut and
remove both locknut and retainer from axle
housing tube.
INSTALLATION
DRIVE PINION OIL SEAL
Replacement
3. Use appropriate tool as listed for the specified axle:
a. J-2222 for 10-1/2" axles.
b. J-0870 for 12-1/4" lb. axles.
4. Tighten inner adjusting nut to specified torque at
the same time rotating hub to make sure all bearing
surfaces are in contact. Then back off inner nut to
specified amount of turn-back.
See figure 76, and refer to Specifications Section for
torque values.
5. Install tanged retainer against the inner adjusting
nut. Align inner adjusting nut so short tang of
retainer will engage nearest slot on inner adjusting
nut.
. Install outer locknut and tighten to correct specified
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torque. Then bend long tang of retainer into slot of
outer nut. This method of adjustment will result in
the proper bearing adjustment.
NOTE: The pinion oil seal may be replaced
with the carrier assembly installed in the
vehicle.
1. Disconnect propeller shaft.
2. Scribe a line down the pinion stem, pinion nut and
companion flange.
3. Use J-8614 to remove the pinion nut and the com­
panion flange.
4. remove the bolts retaining the oil
For 12-1/4" axles,
seal retainer to the carrier, and remove the retainer. See
figure 77.
5. Pry the oil seal from the bore, using care not to damage
the machined surfaces. Thoroughly clean all foreign
material from contact area.
Fig. 76—Tightening Adjusting Nut— Typical
LIGHT DUTY TRUCK SERVICE MANUAL