TM-9-2320-283-20-1

TRUCK TRACTOR, LINE HAUL, 50,000 GVWR, 6X4, M915A1

TECHNICAL MANUAL; ORGANIZATIONAL MAINTENANCE PART 1 OF 3

DECEMBER 1983

TM-9-2320-283-20-1 - Page 423 of 926

TM 9-2320-283-20-1

TROUBLESHOOTING.

2-11.

TROUBLESHOOTING PROCEDURES (Continued).

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

103.

CONTINUOUS AXLE OR WHEEL NOISE (Continued).

Step 3.

Check that brake shoes are not dragging.

Check for overheating of brake drum.

Using jack, raise wheel

until it is clear of ground.

Use tanker bar to pry up under

wheel to check for loose bearings.

Any movement

of wheels indicates loose bearings.

With brakes

released, spin

wheels to check for tight bearings.

Wheel

should spin freely and smoothly.

Remove hub and drum to check condition of bearings (para 3-205).

a. Adjust dragging brakes (para 3-157).

b. Replace bearings, if necessary (para 3-205).

Step 4.

Visually inspect tires.

Inflate tires to proper pressure or replace, if necessary.

(Refer to TM 9-2320-283-10).

Step 5. Check wheel balance.

Notify direct support maintenance.

104.

LUBRICANT LEAKING.

Step 1.

Check all cover plate bolts for tightness.

Tighten bolts or notify direct support maintenance.

Step 2.

Check vent breathers in forward-rear and rear-rear axles.

Clean or replace as necessary (para 3-153).

105.

EXCESSIVE OR UNEVEN TIRE WEAR.

Step 1.

Check front axle wheel alinement.

Aline front wheels (para 3-203).

Step 2.

Check brake adjustment.

Adjust brake, if required (para 3-157).

2-297