TRUCK SERVICE MANUAL
CLEAN, INSPECT AND REPAIR
Parts having ground and polished surfaces such as
gears, bearings, shafts and collars, should be cleaned in a
suitable solvent such as kerosene or diesel fuel oil.
Parts that have been cleaned, dried, inspected and
are be immediately reassembled should be coated with light.
GASOLINE SHOULD BE AVOIDED.
to prevent corrosion. If these parts are to be stored for any
length of time, they should be treated with a good RUST
Do NOT clean these parts in a hot solution tank or
PREVENTIVE and wrapped in special paper or other material
with water and alkaline solutions such as sodium hydroxide,
designed to prevent corrosion.
orthosilicates or phosphates
We do NOT recommend steam cleaning assembled
drive units after they have been removed from the housing.
It is impossible to over stress the importance of
When this method of cleaning is used, water is trapped in the
careful and thorough inspection of drive unit parts prior to re-
cored passage of the castings and in the close clearances
assembly. Thorough visual inspection for indications of wear or
between parts as well as on the parts. This can lead to
stress, and the replacement of such parts as are necessary will
corrosion (rust) of critical parts of the assembly and the
eliminate costly and avoidable drive unit failure.
possibility of circulating rust particles in the lubricant.
A. Inspect all bearings, cups and cones, including those
caused by this practice. Assembled drive units cannot be
not removed from parts of the drive unit and replace if
properly cleaned by steam cleaning, dipping or slushing.
rollers or cups are pitted or damaged in any way.
Complete drive unit disassembly is a necessary requisite to
Remove parts needing replacement with a suitable
puller or in a press with sleeves.
Avoid the use of drifts and hammers. They
Rough parts such as differential carrier castings, cast
may easily mutilate or distort component parts.
brackets and some brake parts may be cleaned in hot solution
tanks with mild alkali solutions providing these parts are not
B. first reduction bevel or hypoid and second reduction
ground or polished. The parts should remain in the tank long
spur gears for wear or damage. Gears which are
enough to be thoroughly cleaned and heated through. This will
pitted, galled or worn or broken through case
aid the evaporation of the rinse water. The parts should be
hardening should be replaced.
thoroughly rinsed after cleaning to remove all traces of alkali.
When necessary to replace the pinion or
CAUTION: Exercise care to avoid skin rashes and inhalation
gear of a spiral bevel or hypoid gear set, the entire
of vapors when using alkali cleaners.
gear set should be replaced. We assume no
responsibility for gears of these types when replaced
in any other manner.
C. Inspect the differential assembly for the following.
Completely assembled axles may be steam cleaned
on the outside only, to facilitate initial removal and
Pitted, scored or worn thrust surfaces of
disassembly, providing all openings are closed. Breathers,
differential case halves, thrust washers, spider
vented shift units, and all other openings should be tightly
trunnions and differential gears.
covered or closed to prevent the possibility of water entering
Thrust washers must be replaced in sets.
The use of a combination of old and new
washers will result in premature failure.
Parts should be thoroughly dried immediately after cleaning.
Use soft, clean, lintless absorbent paper towels or wiping rags
Wear or damage to the differential pinion and
free of abrasive material such as lapping compound, metal
side gear teeth.
filings or contaminated oil. Bearings should never be dried by
spinning with compressed air.
Always replace differential pinions and side
gears in sets.