CHAPTER 12 REPAIR OF FRONT AXLE

TM 10-3930-632-34

CHAPTER 12

REPAIR OF FRONT AXLE

Section I. GENERAL DESCRIPTION

housing. Transmission pinion-to-differential ring gar

12-1.

General

engagement is adjusted by varying the shims between

The front axle adapter mounts directly on the

the differential carriers and axle adapter and between the

transmission housing. The axle adapter houses and

axle adapter and transmission housing.

mounts the differential assembly. The differential case

rides in tapered roller bearings in the axle adapter

Section II. DRIVE AXLE ENDS

cleaning solvent P-D-680.

12-2.

Removal and Disassembly

Inspect the spindle for cracks, worn or

Remove the wheel bearings and hubs (TM 10-

damaged threads, scoring or burring of the bearing

3930-632-12).

seats, and other damage. Remove any light burrs or

Disconnect the brake lines from the fittings on

nicks with a fine stone.

the brake assemblies.

Inspect the ring gear and pinion shaft for

Remove and disassemble the axle end as

cracked or broken gear teeth. Inspect the splines of the

shown in figure 12-1.

pinion shaft for damage or wear. Make sure the

If the brake assembly is damaged,

retaining ring grooves are free of nicks and burrs.

disassemble (Figure 11-6).

Inspect the spindle support for cracks,

damaged seal and bearing seats, worn or damaged

WARNING

threads, distortion, and other damage. Make sure the

'vent in the spindle support is open.

Replace if

Dry cleaning solvent P-D-680 is toxic and

necessary.

flammable. Wear protective goggles and gloves

Inspect the brake drum for cracks, checking

and use only in a well ventilated area. Avoid

and scoring of the braking surface, signs of over-heating,

contact with skin, eyes, and clothes and don't

and other damage.

breathe vapors. Do not use near open flame or

excessive heat. The flash point is 100F -

Replace parts that are damaged beyond

repair.

138F. (38C - 59C). If you become dizzy while

using cleaning solvent, get fresh air immediately

12-4.

Reassembly and Installation

and get medical aid. If contact with eyes is

Reassemble the axle end as shown in figure

made, wash your eyes with water and get

12-1.

medical aid immediately.

Torque the brake assembly-to-spindle support

capscrews to 52-57 foot-pounds.

12-3.

Cleaning and Inspection

Torque the spindle-to-spindle support bolts to

Discard and replace the seals.

115-127 foot-pounds.

Clean the ball bearing by flushing it up and

Pack the ring gear and pinion shaft bearing

down in dry cleaning solvent P-D-680. Use a soft-

with the lubricant recommended in the lubrication chart.

bristled brush to remove hardened lubricant. Blow dry

Total amount of grease used to pack the hub, bearings,

with compressed air, taking care not to spin the bearing.

ring gear, and pinion shall be about one. pound per

Dip the bearing in light oil and wrap it in lint-free paper

wheel.

until it is ready for use.

Before installing the ring gear and hub, make

sure the vent on the spindle support is not blocked.

NOTE

Install the wheel bearings and hubs (TM 10-

3930-632-12).

If either a bearing cone or bearing cup is

Bleed the brake system (TM 10-3930-632-12).

damaged, replace both parts of the bearing set.

Do not replace parts singly.

Scrape or wipe all old grease from the ring

gear and pinion. Clean all metallic parts with dry

Change 1 12-1