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MAINTENANCE
Crusader
MC-8
[ "'°'-2_-3 _ _ _ DATE_Ju_,_ly,~1_97_3 _ _ ]
MANUAL
to be replaced, the established backlash should be
measured and noted for reference for reassembly.
Differential And Gear Assembly Removal:
I.
Loosen jam nut and back off thrust adjusting
screw. Center punch on differential carrier leg
and bearing cap to identify for proper reassem-
bling.
2.
Cut lock wire, remove cap screws and adjusting
nut locks. Remove bearing cap stud nuts or cap
screws, bearing caps and adjusting nuts.
3.
Lift out differential and gear assembly.
Differential And Gear Disassembly:
I.
If
origilf'al identification marks are not clear;
mark differential case halves with a punch or
chisel for correct alignment on reassembling.
2.
Cut lock wire, remove bolts and separate case
halves.
3.
Remove spider, pinions, side gears and thrust
washers.
If
necessary, remove rivets and separate
gear and case.
Ring Gear Removal:
I.
Carefully center punch rivets in center of head.
Use a 9/16" drill bit to drill through head. Press
out rivets.
Pinion And Cage Assembly Removal:
2.
With suitable tool, remove pinion shaft nut
washer and companion flange. Remove pinion
cage stud nuts or cap screws. Remove bearing
cage using puller screws in holes where provided.
CAUTION: The use of a pinch bar will damage -
the shims. Driving pinion from inner end with a
drift will damage the bearing lock ring groove.
3.
Wire shim pack together to facilitate adjustment
on reassembling.
Disassembling Pinion and Cage:
1.
Tap shaft out of cage with mallet or press shaft
from cage. Remove outer bearing from cage.
2.
Remove spacer or spacer combination from
pini<?n shaft. I~ necess~ry to replace rear thrust
beanng or radial beanng, remove with suitable
puller.
REPAIR
Thorough visual inspection for indications of wear
or stress and the replacement of such parts as are
necessary will eliminate costly and avoidable drive
unit failure.
Inspect all bearings, cups and cones, including
those not removed from parts of the drive unit, and
~eplace if rollers or cups are worn, pitted or damaged
many way. Remove parts needing replacement with a
suitable puller or in a press with sleeves. Avoid the
use of drifts and hammers. They may easily mutilate
or distort component parts.
Inspect hypoid gears for wear or damage. Gears
which are worn, ridged, pitted or scored, should be
replaced. When necessary to replace either the drive
pinion or drive gear of hypoid set, the entire gear set
should be replaced.
Inspect the differential assembly for pitted, scored
or worn thrust surfaces of differential case halves,
thrust washers, spider trunnions and differential
gears. Thrust washers must be replaced in sets. The
use of a combination of old and new washers will
result in premature failure.
Check the differential pinion and side gear teeth
for wear or damage. Always replace the differential
pinions and side gears in sets.
Inspect axle shafts for signs of torsional fractures
or other indication of impending failure.
CLEANING
Parts having ground and polished surfaces such as
gears, bearings, shafts and collars, should be cleaned
in suitable solvent such as kerosene or diesel fuel.
CAUTION: Do not clean these parts in a hot
solution tank or with water and alkaline solutions
such as sodium hydroxide, orthosilicates or
phosphates.
Steam cleaning assembled drive units after they
have been removed from the housing is not recom-
mended. When this method of cleaning is used, water
is trapped in the cored passage of the castings and in
the close clearances between parts as well as on the
parts. This can lead to corrosion (rust) of critical
parts of the assembly and the possibility of cir-
culating rust particles in the lubricant. Premature
failing of bearings, gears, and other parts can be
caused by this practice. Assembled drive units cannot
be properly cleaned by steam cleaning, dipping or
slushing. Complete drive unit disassembly is a
necessary requisite to thorough cleaning.
Rough parts such as differential carrier castings
and cast brackets may be cleaned in hot solution
tanks with mild alkali solutions providing these parts
are not ground or polished. The parts should remain
in the tank long enough to be thoroughly cleaned and
heated through. This will aid the evaporation of the
rinse water. The parts should be thoroughly rinsed af-
ter
cleaning
to
remove
all
traces of alkali.
Completely assembled axles may be steam cleaned on
the outside only, to facilitate initial removal and
disassembly, providing all openings are closed.
Breathers, vented shift units, and all other openings
should be tightly covered or closed to prevent the
possibility of water entering the assembly.
Parts should be thoroughly dried immediately after
cleaning. Use soft, clean lintless absorbent towels or
wiping rags free of abrasive material, such as lapping
compound, metal filings or contaminated oil.
Bearings should never be dried by spinning with
compressed air.
REASSEMBLY
Parts that have been cleaned, dried, inspected and
are to be immediately reassembled, should be coated
with light oil to prevent corrosion.
If
these parts are
to be stored for any length of time, they should be
treated with a good RUST PREVENTATIVE and
wrapped in special paper or other material designed
to prevent corrosion.
Replace all worn or damaged parts. Hex nuts with
rounded corners, all lockwashers, oil seals and
gaskets should be replaced at the time of overhaul.
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