GMC 1982 Light Duty Truck Service Manual page 356

3C-14 FRONT SUSPENSION
WHEEL HUBS, BEARING S (Fig. 3 C -1 4 )
R e m o val C, G a n d P Series
1. Raise vehicle on hoist and remove wheel and tire
assem bly. Remove dust cap from end of hub and
withdraw cotter pin.
2. Remove the brake caliper and hang by wire to the
suspension. Do not allow the caliper assembly to hang
by the brake flex line.
3. Remove hub and disc assembly.
4. Remove outer bearing from hub. The inner bearing will
remain in the hub and may be removed by prying out
the inner grease seal.
5. Wash all parts in cleaning solvent.
Inspection
1. Check all bearings for cracked bearing cages, worn or
pitted rollers.
2. Check bearing races for cracks or scoring, check brake
discs for out-of-round or scored conditions and check
bearing outer races for looseness in hubs.
Repairs
Replacement of Bearing Cups
If necessary to replace an outer race, drive out old race
from the hub with a brass drift inserted behind race in
notches in hub. Install new race by driving it into hub with
the proper race installer J-8457, J-8458, J-8849 or J-9276-
2. Remove and install the inner race in the same manner.
Use care when installing new race to start it
N O T IC E :
squarely into hub, to avoid distortion and possible
cracking.
Wheel Stud Replacement (Fig. 3 C - 14)
Use a piece of water pipe or other similar tool to
support the hub while pressing a wheel stud either in or out.
Installation
See N O T IC E on page 1 of this section
N O T IC E :
regarding the fasteners referred to in steps 8 and 9.
1. Clean off any grease in the hub and spindle and
thoroughly clean out any grease in the bearings. Use
Fig. 3C-14--Pressing Hub Bolt
COMPONENT PARTS REPLACEMENT
cleaning solvent. Use a small brush with no loose
bristles to clean out all old grease. Do not spin the
bearing with compressed air while drying it or the
bearing may be damaged.
2. Use a GM approved high temperature front wheel
bearing grease or equivalent. Do not mix greases as
mixing may change the grease properties and result in
poor performance.
3. Apply a thin film of grease to the spindle at the outer
bearing seat and at the inner bearing seat, shoulder,
and seal seat.
4. Put a small quantity of grease inboard of each bearing
cup in the hub. This can be applied with your finger
forming a dam to provide extra grease availability to
the bearing and to keep thinned grease from flowing out
of the bearing.
5. Fill the bearing cone and roller assemblies 100% fill of
grease. A method for doing this is with a cone type
grease machine that forces grease into the bearing. If a
cone greaser is not available, the bearings can be
packed by hand. If hand packing is used, it is extremely
important to work the grease thoroughly into the
bearings between the rollers, cone, and the cage.
Failure to do this could result in premature bearing
failure.
6. Place the inner bearing cone and roller assembly in the
hub. Then using your finger, put an additional quantity
of grease outboard of the bearing.
7. Install a new grease seal using a flat plate until the seal
is flush with the hub. Lubricate the seal lip with a thin
layer of grease.
8. Carefully install the hub and rotor assembly. Place the
outer bearing cone and roller assembly in the outer
bearing cup. Install the washer and nut and initially
tighten the nut to 12 ft. lbs. while turning the wheel
assembly forward by hand. Put an additional quantity
of grease outboard the bearing. This provides extra
grease availability to the bearing.
9. Final wheel bearing adjustment should be performed as
previously outlined.
Fig. 3C-15--Shock Absorber Attachments