Chevrolet 1980 Light Duty Truck Service Manual page 282

3C-14 FRONT SUSPENSION
COMPONENT PARTS REPLACEMENT
W HEEL HUBS, BEARINGS (Fig. 3C-14)
Removal C, G and P Series
1. Raise vehicle on hoist and remove wheel and tire
assembly. 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 o f 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
NOTICE:
it squarely into hub, to avoid distortion and possible
cracking.
Wheel Stud Replacement (Fig. 3C-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 NOTICE on page 1 of this section
NOTICE:
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
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
performed as previously outlined.
SHOCK ABSORBER
Removal (Fig. 3C-15)
1. Raise vehicle on hoist.
2. Remove nuts and eye bolts securing upper and
lower shock absorber eyes.
3. Withdraw shock absorber and inspect rubber eye
bushings. If defective, replace shock absorber assembly.
Installation
Place shock absorber into position over mounting bolts
or into mounting brackets. Install eye bolts and nuts and
torque as shown in Specifications Section. Lower vehicle to
floor.
Fig. 3C-1 4-Pressing Hub Bolt
adjustment should be
LIG H T T R U C K S E R V IC E M AN UAL