GMC 4000 Series Service Manual page 166

ASSEMBLY OPERATIONS
CENTER BEARING ASSEMBLY
Key numbers in text refer to figure 2.
1. If removed, install new dust shields (3) on
shaft or yoke. Tack weld or stake shields in place.
2. Press a grease retainer (7) over each side
of bearing outer race. Pack cavities in retainers
with waterproof grease recommended in LUBRI­
CATION (SEC. 0) of this manual.
3. Install one slinger (8) over end of shaft.
Start bearing and retainer assembly straight on
shaft, then using a suitable sleeve to exert force
on bearing inner race, p ress bearing and slinger
against shoulder on shaft. Install the other slinger
(8) over shaft and position against bearing.
4. Install rubber cushion (4) over bearing a s­
sembly, making sure bearing is centered in hole
in cushion.
5. Position support (6) around cushion and in­
stall cushion retainer (5).
6. On type shown in View B, figure 2, p ress
dust shield (11) onto shaft against slinger (8). On
type shown in View A, install yoke (2) on shaft.
IMPORTANT: Centerline through yoke flanges
must be aligned with centerline of yoke flanges on
other end of shaft. Install nut (1), tighten firmly,
and secure with cotter pin.
SLIP JOINT ASSEMBLY (Fig. 1)
1. Position dust cap on shaft, then install steel
washer and new cork or felt washer on shaft. Coat
shaft splines with lubricant specified in LUBRICA­
TION (SEC. 0) of this manual.
2. Align arrows or markings on splined shaft
and slip yoke and insert shaft into slip yoke. Make
certain yokes on both joints are exactly aligned.
IMPORTANT: Journal cro sses must be in same
plane, otherwise serious vibration will occur, with
resultant damage to both shaft and connected units.
G M C S E R V I C E M A N U A L
Tighten dust cap by hand only; use of wrench will
damage cork or felt washer.
UNIVERSAL JOINT ASSEMBLY
end of bearing cages. Apply lubricant recommend­
ed in LUBRICATION (SEC. 0) to needle rollers in
each bearing to provide initial lubrication.
assem blies in yoke over journal trunnions. Use a
plastic or rawhide hammer to tap bearings into
place.
tain bearings, p ress bearings in far enough to
clear snap ring grooves, then install snap rings.
Hold journal and lightly tap yoke to seat bearings
outward against snap rings.
U-bolts, washers, and nuts on journal bearing as­
sembly and tighten nuts to torque listed in "Speci­
fications."
joint, position propeller shaft at joint, and install
bolts, washers, and nuts. If propeller shaft has
been removed at universal joints, assemble uni­
versal as previously described under "Universal
Joint Assembly." Where complete drive line has
been removed on models having center bearing,
connect center bearing support to crossm em ber.
On "S" models, install propeller shaft guards to
frame supports. Refer to figure 3 for typical pro­
peller shaft installation on "S" models. A visual
inspection must be made of vehicle to determine
the number of propeller shaft guards and center
bearings used.
See following page for "Specifications."
PROPELLER SHAFTS
3. Thread dust cap onto end of slip yoke.
4. Install lubrication fitting in slip yoke.
NOTE: Make sure seals are in place on inner
1. Install lubrication fitting in journal.
2. Install journal in yoke, then install bearing
3. On universal joints using snap rings to r e ­
4. On universal joints using U-bolts, install
PROPELLER SHAFT INSTALLATION
If propeller shaft has been removed at flange
Sec. 4D
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