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 163 of 926

TM 9-2320-283-20-1

TROUBLESHOOTING.

2-10.

TROUBLESHOOTING SYMPTOM INDEX.

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

4.

ENGINE OVERHEATS (TEMPERATURE EXCEEDS 210°F) (Continued).

Step 3

Check water temperature sending unit.

Refer to malfunction 31, step 8.

Step 4

With engine running and radiator cap removed, check for proper

coolant flow.

a

Replace thermostat (para 3-59).

b

Replace water pump (para 3-64).

Step 5

With engine running and radiator cap installed, check for signs

of leaks and collapsed radiator hoses.

a

Replace hose, if necessary (para 3-58).

b

Replace radiator, if leaking (para 3-53).

Step 6

Check fan clutch operation.

a

Check air valve tubes for cracks.

Replace if necessary

(para 3-163).

b

Replace air valve (para 3-66).

c

Replace fan clutch (para 3-65).

Step 7

Notify direct support maintenance.

5.

INTERMITTENT LOSS OF POWER.

Step 1

Check for leaking fuel lines.

Tighten connections, or replace fuel lines (para 3-28 or

3-36).

Step 2

Check fuel tank vent plug for blockage.

Remove and clean fuel tank air vent (para 3-34).

2-38