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Sec. 2
Page 22
GM COACH MAINTENANCE MANUAL
REAR AXLE
Gasoline, which is sometimes used as a bearing
cleaner, should not be used. Also, bearings should
never be placed in a hot solution tank for cleaning.
2. After old lubricant is loosened, hold bear-
ing races so that bearings cannot rotate, then brush
bearings with soft bristled brush until all grit and
dirt has been removed.
3. Rinse bearings in clean fluid; then, while
holding races, blow dry with compressed air. Be
sure air stream is moisture free.
4. Inspect bearings as instructed under "In-
spection Operations" later in this section.
If
bear-
ings pass inspection, dip bearings in differential
lubricant, recommended in LUBRICATION (SEC.
13), then wrap bearings in clean cloth or paper
until ready to reassemble axle.
CLEANING PARTS
Immerse all parts in suitable cleaning fluid
and clean parts thoroughly.
Use a stiff bristle
brush to remove all old lubricant. Remove par-
ticles of gaskets which may adhere to mating faces
of axle housing, differential carrier, hubs, and
axle shaft flanges.
Clean out lubricant channels
in pinion cage and differential carrier.
Clean
housing breather. Make certain that interior of
axle housing is thoroughly cleaned.
INSPECTION
Whenever available, the Magna Flux method
should be used on all steel parts, except ball and
roller bearings. This method is especially suited
for inspection of ground or highly finished sur-
faces for wear and cracks which otherwise would
not be visible to the naked eye.
INSPECTION OPERATIONS
1. Bearings. Rotate each bearing slowly, and
at the same time examine bearing for roughness,
damage, defects, or wear. Note condition of bear-
ing cage. Replace bearing if cage is damaged or
if any of the conditions previously noted exist.
2. Gears.
Examine drive gear, drive pinion,
and differential side gears for damaged teeth, worn
spots in surface hardening, and distortion.
Ex-
amine bushings in differential pinions for grooves,
or excessive wear, and check fit of gears on spi-
der.
Refer to "Specifications" later in this sec-
tion for limits.
Check radial clearances between
differential side gear hubs and bores in differential
carrier.
3. Differential Case. Inspect differential case
assembly for cracks, distortion, or damage.
If
case is in good condition, thoroughly clean case
and cover; then assemble case with bolts and
mount in lathe centers or "V" block stand.
If
lathe is not available, install differential side bear-
ings and mount case in differential carrier as di-
rected under "Differential and Drive Gear Instal-
lation" later in this section. Install dial indicator
and check differential case run-out. Refer to "Spe-
cifications" at end of this section, for run-out
limits.
Whenever run-out exceeds limits, differ-
ential case run-out may be corrected as later de-
scribed under "Repair" in this section.
4. Axle Shafts.
Examine splined end of axle
shaft for twisted or cracked splines, twisted shaft,
or damaged teeth on flange.
If
any of above con-
ditions are evident, install new axle shafts.
5. Axle Shaft and Flange Run-Out. Install axle
shaft assembly in lathe centers or "V" blocks.
Check shaft run-out with dial indicator; if run-out
exceeds limits listed in "Specifications" at end of
this section, discard axle shaft. Position dial in-
dicator so that indicator shaft end contacts inner
surface of flange near outer edge, then check
flange run-out. If run-out exceeds limits listed
in "Specifications" at end of this section, discard
axle shaft.
AXLE HOUSING INSPECTION
If check made prior to disassembly of axle in-
dicated a bent condition at axle housing, make
more complete check of housing on surface plate
and after locating point at which housing is bent,
the housing may be straightened if equipment is
available.
Any straightening must be done with
axle housing COLD DO NOT APPLY HEAT TO
HOUSING.
OIL SEAL INSPECTION
Replacement of spring loaded oil seal when
unit is disassembled is more economical than pre-
mature overhaul to replace these parts at a future
time.
Further, loss of lubricant through a worn
seal may result in failure of other parts, such as
gears and bearings.
Handle seals carefully, particularly when seals
are being installed. Cutting, scratching or curling
under of lip of seal seriously impairs efficiency
of seal.
Use of Permatex or equivalent around
outer diameter of seal is recommended to insure
against leakage at that point.
REPAIR
Differential Case. Excessive run-out on differ-
ential case may be corrected by machining flange
on gear side of case.
Remove sufficient metal
from flange to correct excessive run-out.
Metal
must be cut on a true plane removing just enough
metal to bring run-out within limits listed in "Spec-
ifications" at end of this section. After differential
case has been machined, remove burrs and clean
case assembly thoroughly.
Propeller shaft Flange.
Whenever inspection
indicates that exterior surface of flange which con-
tacts oil seal is corroded or pitted, the condition
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