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 451 of 987

TM 9-2320-285-24-1

2-39.

FRONT AXLE TROUBLESHOOTING

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

1.

RAPID OR UNEVEN TIRE WEAR

Check that tires are inflated to 120 psi.

a. If tires are not inflated to 120 psi, inflate to 120 psi.

b. If tires are inflated to 120 psi, notify direct support maintenance.

2.

FRONT AXLE SHIMMYS OR VIBRATES

Check shock absorbers for wear.

a. If shock absorbers are worn, replace (para 2-64).

b. If shock absorbers are not worn, notify direct support maintenance.

3.

CONTINUOUS WHEEL NOISE

Step 1.

Check front 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 front axle hubs for proper lubrication.

a. If front axle hubs are not lubricated, lubricate (para 2-43a).

b. If front axle hubs are lubricated, 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); repeat for other wheel.

a. If end play is noticeable, adjust or replace wheel bearings (para 2-43b).

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

Step 4.

Remove wheel (para 2-43b), clean bearings (para 2-43b), and inspect bearings (para 2-43b) for

damage or wear.

a. If bearings are damaged or worn, replace (para 2-43b).

b. If bearings are okay, reinstall and lubricate (para 2-43b).

Then notify direct support maintenance.

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