TM-9-2320-273-34
TRUCK TRACTOR, LINE HAUL; LIGHT EQUIPMENT TRANSPORTER; TRUCK CHASSIS; MEDIUM EQUIPMENT TRANSPORTER
TECHNICAL MANUAL; DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE
DECEMBER 1980
TM-9-2320-273-34 - Page 465 of 801
TM 9-2320-273-34
b. Rough Parts.
WARNIN G
Exercise care to avoid skin rashes and
inhalation of vapors when using alkali
cleaners.
Rough parts, such as differential carrier castings, cast brackets, and some brake parts may be cleaned in hot
solution tanks with mild alkali solutions (item 25 App B) 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 after cleaning to remove all
traces of alkali. If this solution is not available, dry cleaning solvent may be used.
c. Complete Assemblies.
Completely assembled axles may be steam cleaned on the outside
only, to facilitate initial removal and disassembly, provided 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.
d.
Drying.
Parts should be thoroughly dried immediately after cleaning. Use soft, clean, Iintless
absorbent paper towels or wiping rags free of abrasive materiel, such as lapping compound, metal filings or
contaminated oil. Bearings should never be dried by spinning with compressed air.
e. Corrosion Prevention.
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 preventive
and wrapped in special paper or other
material designed to prevent corrosion.
11-7. Inspection.
a. Tapered Roller Bearings.
The forward rear carrier employs tapered roller bearings in five areas: at
the input and output shafts, the drive pinion, the interaxle differential, and main differential. The rear rear
carrier employs tapered roller bearings at the drive pinion and main differential. Inspect all bearings, cups
and cones, including those not removed from parts of the drive unit, and replace if rollers or cups are worn,
pitted or damaged in any 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. If any
of the following bearing conditions exists, the bearings must be replaced:
(1) Large ends of rollers worn flush to recess, or radii at large ends of rollers worn sharp,
(2) Visible step wear, particularly at the small end of the roller track.
(3) Deep indentations, cracks or breaks in bearing cup and/or cone surfaces.
(4) Bright rubbing marks on the dark phosphate surfaces of the bearing cage.
(5) Etching or pitting on functioning surfaces.
(6) Spalling or flaking on bearing cup and/or cone surfaces.
11-19
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