GMC 4000 Series Service Manual page 165

Sec. 4D
Page 158
PROPELLER SHAFTS
Propeller Shaft Guard
Propeller Shaft
Center Bearing
Support
Dust Cap
Washer (Steel)
Washer (Cork)
Bolt
Rear Axle
ball bearing. This is a sealed bearing and cannot
be disassembled without being destroyed.
5. If dust shields (3) are damaged, use a
chisel to break welds and remove shields.
CLEANING AND INSPECTION
PROPELLER SHAFT
Thoroughly clean old grease and dirt from
shaft splines, then check splines for wear, warp-
age, and cracks. If shaft is worn, warped, or crack­
ed, replace with new shaft. Welding of broken shaft
is not recommended, since this operation requires
special balancing facilities.
UNIVERSAL JOINT
Wash all parts in cleaning fluid. Make sure
lubricant passages in journal cross are clean. Soak
needle bearings and cages in cleaning fluid to soften
particles of hardened grease, then wash in cleaning
fluid, using a stiff brush if necessary to remove all
old lubricant. Check each bearing for missing roll­
ers. Refer to "Specifications" at end of this se c ­
tion for correct number of rollers. After needle
bearing assem blies are thoroughly clean, apply
clean lubricant to rollers and turn on trunnion of
journal to check wear. Refer to LUBRICATION
(SEC. 0) for type of lubricant.
G M C S E R V I C E M A N U A L
Figure 3 — Propeller Shaft Guards Installed ("S " Series Sh ow n )
If excessive clearance is noted, discard journal
and bearings and replace with new parts contained
in universal joint repair kit.
SLIP JOINT
Using a suitable cleaning fluid, clean all dirt
and old grease from slip yoke, slip yoke splines,
and shaft splines. Carefully inspect slip yoke
splines for wear or evidence of twisting. Check
clearance between slip yoke splines and shaft
splines. If backlash is excessive, replace parts.
CENTER BEARING
Wash all parts except ball bearing and rubber
cushion in suitable cleaning fluid.
DO NOT IMMERSE SEALED BEARING IN
CLEANING FLUID.
Wipe bearing and cushion clean with a cloth
dampened with cleaning fluid.
Check the bearing for wear or rough action by
rotating inner race while holding outer race. If
wear or roughness is evident, replace with new
bearing.
Examine rubber cushion for evidence of hard­
ening, cracking, or deterioraton. Replace with
new part if damaged in any way.
Grease retainers and slingers are serviced
only as a part of the bearing assembly.
T P M -9 1 4 2 -1