Figure 10-10. Installing Differential Bearing Caps.

TM 10-3930-633-34

process to check parts. Examine teeth of all gears

(5) Check ring gear and pinion contact by

carefully for wear, pitting, chipping, nicks or

applying oiled red lead to the ring gear teeth.

scores. If gear teeth show spots where case

Rotate the pinion through one full turn of the ring

hardening is worn through, install new gear.

gear. The red lead will be squeezed away from the

Small nicks may be carefully removed with a

areas of tooth contact, leaving bare spots on the

suitable hone.

ring gear teeth which are the exact size and shape

(10) Use new gaskets for reassembly.

of the tooth contact.

c. Reassembly.

(6) The proper pattern (on drive side of

teeth) will be centered between root and top of the

(1) Press differential pinion bearings on

pinion, using an arbor press and tubular pilot

ring gear teeth and will be slightly toward the toe

which will contact the inner race of the bearing

oft he tooth; that is, closer to the inside diameter.

cmly. Install pinion into differential carrier

Adjust pinion in or out, and ring gear side-to-

housing.

side, to obtain this pattern. Adjustment will be

(2) Press differential bearings onto case

made by means of shims, installed under the

assembly. Bolt ring gear to case and tighten

differential and pinion bearing cups.

screws around ring gear flange to 82 ft/lbs.

(7) Adjust nuts over differential bearings so

(3) Place thrust washers behind side gears

that 5 - 15 in./lbs. of torque (on spring scale) is

and fit side gears into differential case. Position

required to start ring gear turning. When this

preload is obtained, install the nut lock and cotter

pinion gears in mesh with side gears, and with

thrust washers in place, press side gear pin

pin to secure the adjustment.

through pinions and case.

(8) Differential is ready for assembly to drop

( 4 ) Install differential assembly into

gearcase. R e f e r to paragraph 10-3, under

housing, with bearing cups in place on differential

"Reassembly."

case bearings. Position threaded adjuster nuts as

10-5. Rear Springs

shown in figure 10-10 and install bearing caps.

a. Removal. Refer to Chapter 2, Section IV, for

procedures covering removal of the rear axle and

springs.

b. Cleaning and Inspection.

(1) Clean the spring assemly using solvent,

Federal Specification P-D-680, and a stiff wire

brush.

(2) Inspect bushings in the spring eyes for

wear or deterioration. Replace as required.

(3) Check for loose center bolt or rebound

clips and tighten as necessary.

(4) Check for broken or distorted leaves, and

replace spring assembly if any leaf is bent or

broken.

c. Installation. Refer to Chapter 2, Section IV,

for procedures covering installation of springs

and axle.

Figure 10-10. Installing Differential Bearing Caps.

10-7