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 TM 10-3930-633-34
the faulty part should be replaced with a new
(3) Cut lockwire and remove screws (23) to
part.
separate differential carrier from drop gearcase.
(9) If magna-flux process is available, use
(4) Remove nut (17) and cotter pin (18). Pull
process to check parts. Examine teeth of all gears
off flange (15), washer (16) and seal (19).
carefully for wear, pitting, chipping, nicks or
(5) Remove expansion plug (8) from case
scores. If gear teeth show spots where case
(22). Remove retaining rings (9 and 13), and
hardening is worn through, install new gear.
remove bearings (10 and 14).
Small nicks may be carefully removed with a
(6) Remove pinion gear (21 ), and idler gear
suitable hone.
shaft (11) and gear (12).
c. Cleaning and Inspection.
(10) Seals and gaskets should be replaced
with new ones at reassembly.
(1) Clean the case and all metal parts in
accordance with general cleaning instructions in
d. Reassembly (see figure 10-5).
(1) Install bearings (10 and 14) into front
side of case (22). Install retaining rings (9) and
and gasket cement.
plug (8).
(2) Clean each bearing in a container filled
(2) Install gear (12) and shaft (11). Install
with (clean) solvent, Federal Specification P-D-
gear (21). Install bearings (10) on opposite ends of
680, Wash bearings thoroughly. Remove bearings
shafts and secure in place by installing retaining
from solvent and strike larger side of cone flat
rings (9 and 13).
against a block of wood to dislodge solidified
(3) Install spacer (20), seal (19), flange (15)
particles of lubricant. Repeat above operations
and washer ( 16). Secure by installing nut (17).
until bearings are thoroughly clean. Bearings
Tighten nut to 150-175 ft/lbs. and install cotter
must be completely free from grease, oil and
pin (18).
solidified particles of lubricant.
(4) Install new gaskets (24 and 25), and
(3) After washing bearings, blow them dry
with compressed air. Be careful to direct air
assemble differential carrier to drop gearcase.
Secure by installing screws (23). Tighten screws
pressure across bearing to avoid spinning. DO
NOT SPIN BEARINGS. Bearings may be slowly
to 50 - 60 ft/lbs. and lockwire together.
rotated by hand to facilitate drying procedure.
(5) Install gear (7) on differential pinion
(4) Inspect bearings carefully to determine if
shaft. Install nut (5) and torque to 150 - 175
they are in good condition and suitable for further
ft/lbs. Install cotter pin (6).
service.
(6) Install drain and filler plugs, and
(5) When bearings are clean and dry,
position cover (1) on case (22). Install thirteen
lubricate them with new engine oil. Rotate the
screws (2) and lockwashers (3). Torque screws to
bearing by hand, and check for wear or rough
50 - 57 ft/lbs.
spots.
(6) Carefully inspect races, retainers, and
installation during axle reassembly.
balls for wear, chipping or nicks.
(7) If any defects are found, the bearings
a. Disassembly. Refer to figure 10-6 for parts
should be scrapped, and replaced with new ones
identification, noting that parts (1) through (4)
at reassembly.
are not used with drop gearcase, and proceed as
(8) Examine the gears for cracked, chipped
follows :
or scored teeth. If any of these conditions exist,
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