TM-9-2320-285-24-1

TRUCK TRACTOR, YARD TYPE, 43,500 LB GVW, DED, 4X2, ARMY MODEL M878A1

TECHNICAL MANUAL; ORGANIZATIONAL, DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE MANUAL

OCTOBER 1985

TM-9-2320-285-24-1 - Page 453 of 987

TM 9-2320-285-24-1

2-40.

REAR AXLE TROUBLESHOOTING

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

1.

LUBRICANT LEAKING FROM DIFFERENTIAL BREATHER

Check lubricant level.

Drain to proper level (para 2-44a).

2.

CONTINUOUS AXLE OR WHEEL NOISE

Step 1.

Check rear wheel lug nuts for looseness.

a. If lug nuts are loose, tighten (para 2-57).

b. If lug nuts are tight, go to step 2 below.

Step 2.

Check lubricant level.

a. If lubricant level is below level plug opening, add lubricant (para 2-44a).

b If lubricant level is at level plug opening, go to step 3 below.

Step 3.

Check wheel bearings for proper adjustment (raise wheel and use pry bar to check for any noticeable

end play) or damage.

Repeat for other wheels.

a. If end play is noticeable, adjust or replace wheel bearings (para 2-44b).

b. If end play is not noticeable, go to step 4 below.

Step 4.

Check axle shafts for damage.

a. If axle shafts are damaged, replace (para 2-44b).

b. If axle shafts are not damaged, notify direct support maintenance.

3.

DIFFERENTIAL CARRIER ASSEMBLY OVERHEATING

Check lubricant level.

a. If lubricant level is below level plug opening, add lubricant (para 2-44a).

b. If lubricant level is at level plug opening, notify direct support maintenance.

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