Chevrolet 1980 Light Duty Truck Service Manual page 343

Fig. 4B-33--Rem oving O uter Bearing and Cup
4. Use appropriate tool as specified in Step 2 to remove
adjusting nut from housing tube. Remove thrust washer
from housing tube.
5. Pull hub and drum assembly straight off axle
housing.
6. Remove oil seal, and discard.
B earing/Cup-Rem oval
1. Use a hammer and long drift to knock the
bearing, cup and oil seal from the hub assembly.
2. Remove bearing snap ring with a pair of
outer
pliers.
3. With J-24426 on Handle J-8092, as shown in figure
4B-33, drive bearing and cup from the hub assembly.
outer
Inspection and Cleaning o f Bearings
1. Inspect bearing rollers for excessive wear, chipped
edges, and other damage. Slowly move rollers around cone
to detect any flat or rough spots on rollers or cone.
2. Examine bearing cups in hub for pits, cracks, and
other damage.
3. Examine axle shaft flange studs, wheel studs, hub
splines, hub bore, and tapped holes for evidence of damage.
Clean up threads or replace parts where required.
4. Examine oil seal sleeve for evidence of wear or
roughness, check axle housing oil deflector and brake drum
oil deflector for evidence of damage. Replace parts where
required.
5. Examine brake drum for excessive scoring and other
damage. To replace brake drum refer to "Brake Drum
Replacement."
6. Immerse bearing cone and roller assemblies in
cleaning solvent. Clean with stiff brush to remove old
lubricant. Blow bearings dry with compressed air, directing
air stream across bearing. Do not spin bearings while
blowing them dry.
7. Thoroughly remove all lubricant from axle housing
tube and from inside the hub, wipe dry. Make sure all
particles of gasket are removed from outer end of hub, axle
shaft, and hub cap.
8. Scrape old sealing compound out of oil seal bore in
the hub.
B earing/C up-lnstallation
1. Place
outer
2. Install cup of outer bearing into hub by using
Handle J-8092 and J-8608,
sure J-8608 is upside down on driver handle, so that chamfer
does contact bearing cup.
not
3. Drive cup
4. Using a pair of pliers, install snap ring into its
groove.
5. Drive cup back
24426, as shown in figure 4B-33.
6. To install
Handle J-8092. Drive cup into place until it seats against
shoulder of hub bore.
7. Install new oil seal with J-24428.
Drum -Non-Demountable-Type-Fig. 4B-31
Replacement
Construction of the nondemountable-type hub and
drum assembly is such that replacement cannot be
accomplished with the hub assembly installed on the
vehicle.
1. Separate the drum and hub by removing the drum-
to-hub retaining bolts, hub stud nuts, or by pressing out the
wheel studs, as applicable.
2. Position brake drum to hub assembly, making
certain that all drain holes are in alignment.
inner
3. Apply a light, even coating of sealing compound to
the hub oil deflector contact surface, and position deflector
to drum.
4. Install drum-to-hub retaining bolts, hub stud nuts,
or press wheel studs into drum, as applicable.
W heel Bolt
Replacement
Wheel bolts are serrated and may also be swaged in
place; however, replacement procedure remains the same
for both types of installation.
Press bolts out of hub flange and press new bolts into
place, making sure they are a tight fit. If all bolts are
removed, be sure that hub oil deflector is in position under
bolt heads. See figure 4B-34.
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. Install thrust washer so that tang on I.D. of washer
is in keyway on axle housing.
5. Install adjusting nut and complete the installation
as directed under "Bearing Adjustment."
BEARING A D JU S TM E N T
Before checking bearing adjustment, make sure brakes
are fully released and do not drag.
REAR AXLE
bearing into hub.
installed upside-down
beyond the snap ring groove.
snap ring by using J-
against
bearing cup, use J-24427 on
inner
LIG H T TR U CK S ER V IC E M AN UAL
4B-19
. Be