INSPECTION - TM-9-2320-303-24-20226

TM 9-2320-303-24-2

FORWARD-REAR AXLE DIFFERENTIAL CARRIER REPAIR - CONTINUED

0257 00

INSPECTION

Tapered Roller Bearings. 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 replace-

ment with a suitable puller or in a press with sleeves. Avoid the use of drifts and hammers. They may easily muti-

late or distort component parts. If any of the following bearing conditions exist, 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.

Drive Pinion Gear and Ring Gear. Inspect the pinion shaft and ring gear for wear or damage. Gears which are

worn, ridged, pitted, or scored should be replaced. When necessary to replace either the pinion shaft or ring gear of

a set, the entire gear set must be replaced.

Differential Gears. Inspect the differential assembly for the following.

(1)

Check for pitted, scored or worn thrust surfaces of differential case halves, thrust washers, spider trun-

nions, and differential gears. Thrust washers must be replaced in sets. The use of a combination of old and

new washers will result in premature failure.

(2)

Inspect for wear or damage to the differential pinion and side gear teeth. Always replace differential pin-

ions and side gears in sets.

Helical Gears. Inspect helical gears for wear or damage. Gears which are worn, ridged, pitted or scored, should be

replaced. Helical gears must be replaced in sets. New helical gears in sets must be permanently marked with

matching or timing symbols to aid in correctly positioning the teeth of both gears at reassembly.

REPAIR OR REPLACEMENT

General.

(1)

Replace all worn or damaged parts. Hexnuts with rounded corners, all lockwashers, oil seals and gaskets

or silicone gasket material should be replaced at the time of overhaul.

(2)

Remove nicks, mars, and burrs from machined or ground surfaces. Threads must be clean and free to

obtain accurate adjustment and correct torque. Studs must be tight prior to reassembling the parts.

(3)

When assembling component parts, use a press where possible.

Silastic Application.

(1)

Removal of all gaskets including silicone is accomplished by peeling or scraping the used gasket off the

carrier-to-housing surfaces.

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