GMC 4000 Series Service Manual page 139

Sec. 4A
Page 132
REAR AXLE A N D CONTROLS
Figure 8 — Propeller Shaft Yoke H olding Bar
PINION OIL SEAL REPLACEMENT
Several types of oil seal installation are used
on axles covered by this publication. One type has
the seal assembly installed directly into differen­
tial carrier, while another has the seal installed
in a retainer which is attached to carrier.
Figure 9 — Propeller Shaft Yoke Puller (Typical)
G M C S E R V I C E M A N U A L
REMOVAL
as directed in "PROPELLER SHAFTS" (SEC. 4D).
(fig. 8) while removing yoke retaining nut and
washer.
lustrated in figure 9 to remove propeller shaft
yoke.
into carrier, use available removing tool such as
punch or pry bar. Remove flat washer from coun­
terbore in carrier.
are attached to carrier by cap screw s, remove
screws and washers, then lift assembly from car­
rier.
installed in a groove in pinion cage, which should
be replaced.
INSTALLATION
differential carrier is cleaned of all deposits, such
as oil, dirt, etc.
ed into carrier, install flat washer in carrier, then
install strip sealer around carrier counterbore
and against washer.
sealing compound, then position assembly in car­
rier. Use suitable available tool to p ress or drive
retainer into carrier until seated against flat
washer.
is attached to carrier by cap screw s, install cork
seal in groove or gasket on pinion cage.
oil passage holes in pinion cage.
pinion and against pinion cage.
1. Remove propeller shaft from yoke at axle
2. Hold propeller shaft yoke with holding bar
3. Use suitable puller in manner typically i l ­
4. On axle where seal and retainer is pressed
5. On axles where seal and retainer assembly
NOTE: Some axles also have a cork seal
1. Before installing new seal, be sure that
2. On axles where seal and retainer is p ress­
3. Coat outer surface of seal retainer with
4. On axles where seal and retainer assembly
NOTE: Be sure that gasket does not cover any
5. Install oil seal and retainer assembly over
Figure 1 0 — Electric Shift Unit Seal M a rk in g s
Secure with cap