Reassembly of Drive Axle

TM 10-3930-609-35

and ring gear position may be

c. Place spider pinions and thrust washers on

necessary

the

following

cross and insert into either case half.

procedures

before

correct

d. With match marks alined, assemble case halves

adjustment is achieved. It is not

together and secure with screws. Lockwire screws.

possible to specify the exact

e. Press bearing cones and rollers onto trunnions

thickness of shims to be added, -

of case halves, assuring that cones bottom against case

removed, or exchanged at any stage.

shoulders.

This must be determined by trial and

f. Place bearing cups on cones and rollers and

error.

aline differential in half of differential housing.

Aline second half of differential housing

(1) Remove adapter assembly. Apply a thin

(including gasket between halves) and secure with

coating of red lead to drive face of ring gear teeth, and

screws and nuts.

install adapter to axle.

g. Install axle housings on differential housing,

(2) Engage input driven gear with a pry bar or

including shims. Secure axle housings with screws and

large screwdriver, and turn it until side gears have made

washers.

one revolution in the forward direction.

h. Check and if necessary adjust differential

(3) Remove adapter assembly from axle.

bearing preload as follows:

Examine teeth of ring gear, and compare marks in red

lead from pinion gear contact with examples shown in

Note

figure 3-3.

Ring gear and pinion backlash

adjustment

and

tooth

contact

Note

adjustment are interrelated so that a

Ring gear is on left side of pinion

change in either affects the other.

when installed. References to follow

will be on this basis.

(1) Install both axle housings with same

thickness of shims at each side as was removed at

(4) If marks in red lead compare with those

disassembly.

shown in view A or C, figure 3-3, indicating high, narrow

(2) Turn ring gear by hand, testing for

tooth contact (pinion too far out), adjust by adding one

noticeable drag due to preload on bearings. If no drag

or more shims to the pinion gear shaft to move pinion in

exists, reverse procedure in (1) above and remove

direction indicated in view A, and transfer one or more

shims and repeat test until drag is noticed. Shims 0.003

axle housing-to-differential housing shims from- left side

inch thick, 0.005 inch thick, and 0.020 inch thick are

of differential housing to right side.: Repeat procedures

used. Decrease total shim thickness in 0.001 inch steps

in (1) through (3) above to check results of adjustment.

by removing two 0.003 inch shims and adding one 0.005

inch shim.

Note

(3) If drag is noticeable on first trial, reverse

Do not change total thickness of side

procedure for decreasing shim thickness in (2) above

gaskets used; merely transfer them

until no drag is present, then decrease total shim

from one side to the other as needed,

thickness until drag is felt. Using axle shaft and nut as

so differential bearing preload will

adapter, check for 15 ft-lb drag caused by preload. Add

not be changed.

or remove shims to obtain this value.

i. Check pinion and ring gear backlash adjustment

(5) If marks in red lead compare with those

as follows:

in view B or D, figure 3-3, reverse adjustment procedure

(1) Install adapter-to-axle gasket and install

given in (4) above, and repeat (1) through (3) above to

adapter assembly to assembled axle. If motor is

check results of adjustment.

attached to adapter, remove screws, nut and washer

k. Press inner axle bearing cups into axle housing

and remove motor from adapter at this time.

to bottom (fig. 3-2).

(2) Remove drain plug from differential

I. Press both axle shaft bearing cones and rollers

housing. Install plug with slightly longer reach to contact

onto each axle shaft.

and lock ring gear rotation.

m. Insert axle shafts splined ends through axle

(3) Remove cover screws and cover from

housings and engage in splined bores of side gears.

adapter. Install a dial indicator on adapter cover boss,

With axle shafts in proper alinement, insert cone and

to take a reading at a point 1/16 inch below top of one of

rollers on axle shafts will be seated in bearing cups

the teeth of input gear. Rotate input driven gear through

previously pressed into axle housings.

freedom permitted by pinion and ring gear backlash.

n. Install outer bearing cups.

Reading is to be 0.019 inch to 0.046 inch. Adjustment

o. Install oil seals in brake assemblies.

to correct is given in j below.

p. Install brake assemblies on axle housings with

j. Determine and adjust ring gear and pinion

nuts and washers, including shims as required to obtain

relationship, after performing g and h above, as follows:

0.000 inch to 0.006 inch preload to axle

Note

Several adjustments of both pinion

3-6