Chevrolet 1988 Light Duty Truck Repair Manual page 170

4B3-4 91/2-INCH RING GEAR
• Drive the pinion out of the housing with a
hammer and a soft drift (figure 7).
• Remove the cover (25) and the pinion (15).
19. C ollapsable spacer (11) from the pinion.
20. Outer seal (9) and outer pinion bearing (10).
21. Inner bearing (13) and shim (14) from the pinion.
• P ress th e b e a rin g o ff th e p in io n
J 22912-01 (figure 8).
• Remove the shim.
22. Bearing cups (10) and (13) from the axle housing
using a hamm er and a punch.
• Work the cups out of the housing evenly,
moving the punch back and forth between one
side of the cup and the other.
CLEANING
Do not steam clean drive parts having ground and
polished surfaces such as gears, bearings, and shafts.
These parts should be cleaned in a suitable solvent. All
parts should be disassem bled before cleaning.
Parts should be thoroughly dried im m ediately after
cleaning. Use soft, clean, lintless rags. Parts may be dried
with compressed air. Do not allow the bearings to spin
while drying them with com pressed air.
It is very im portant to carefully and thoroughly inspect
all drive unit parts before reassembly.
Thorough inspection of the drive parts for wear or
stress and subsequent replacem ent of worn parts will
elim inate costly drive com ponent repair after reassembly.
AXLE HOUSING
I?
Inspect
• The c a rrie r bore for nicks or burrs tha t w ould
prevent the outer diam eter of the pinion seal from
sealing. Remove any burrs that are found.
• The bearing cup bores for nicks or burrs. Remove
any burrs that are found.
• The housing for cracks. Replace the housing if any
cracks are found.
• The housing for foreign material such as metal
chips, dirt, or rust. Refer to " C le a n in g " in this
section.
DIFFERENTIAL
u s in g
L 1
In sp ect
• Pinion gear shaft for unusual wear.
• Pinion gear and side gear teeth for wear, cracks,
scoring, and spalling.
• Thrust washers for wear.
• The fit of the differential side gears in the differential
case.
• The fit of the side gears on the axle shafts.
• Differential case for cracks and scoring.
• Replace all worn parts.
PINION AND RING GEAR
I?
Inspect
• Pinion and ring gear teeth for cracking, chipping,
scoring, or excessive wear.
• Pinion splines for wear.
• Pinion flange splines for wear.
• The fit of the pinion on the pinion flange.
• The sealing surface of the pinion flange for nicks,
burrs, or rough tool marks w hich w ould cause
dam age to the seals' inside diam eter and result in
an oil leak.
• Replace all worn or broken parts.
• Ring and pinion gears are m atched sets and are
both replaced any tim e a replacem ent of either is
necessary.
BEARINGS
In sp ect
Bearings visually and by feel.
The bearings should feel smooth when oiled and
rotated while applying as much hand pressure as
possible.
The large end of the bearing rollers for wear. This is
where tapered roller bearing wear is most evident.
B e a rin g cup s fo r wear, cracks, b rin e llin g and
scoring.
Bearings and cups are only replaced as sets.
INSPECTION