GMC 1989 Light Duty Truck Repair Manual page 152

8
4B2-4 1 / 2-INCH RING GEAR
Figure 5— Removing the Drive Pinion Nut
20. Bearing cups (5) and (39) from the axle housing
using a hammer 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. Use the slots
provided for this purpose.
Figure 6— Removing the Pinion Flange
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 disassembled before cleaning.
Parts should be thoroughly dried immediately 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 compressed air.
INSPECTION
It is very important to carefully and thoroughly inspect
all drive unit parts before reassembly.
Thorough inspection of the drive parts for wear or
stress and subsequent replacement of worn parts will
eliminate costly drive component repair after reassembly.
AXLE HOUSING
Inspect
1?
• The ca rrier bore for nicks or burrs that would
prevent the outer diameter 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 leaning" in this
section.
DIFFERENTIAL
Inspect
I 9
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.