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 426 of 926

TM 9-2320-283-20-1

TROUBLESHOOTING.

2-11.

TROUBLESHOOTING PROCEDURES (Continued).

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

107.

AIR PRESSURE LOW (Continued).

Step 2.

Check for loose air connections between the compressor, governor, and air reservoirs.

Tighten any loose air connections and replace damaged components, air lines, and connectors

(para 3-163).

Step 3.

Check air governor by noting on air gages when air compressor shuts off and starts up again.

Air

compressor should shut off no higher than 125 psi and start when air pressure drops 25 psi after shut off.

Notify direct support maintenance if air compressor does not operate within the pressure

specifications above.

Step 4.

With the engine not running, loosen the compressor output line at compressor and listen for escaping air.

a. If air escapes continuously, replace the check valve in that line at the supply reservoir (para 3-191).

b. If the check valve is OK, notify direct support maintenance.

Step 5.

Check air line connections for tightness and air lines for cracks or breaks.

Tighten or replace connections and lines as necessary (para 3-163).

108.

AIR PRESSURE HIGH.

Step 1.

Check for inoperative pressure safety relief valve on the supply reservoir.

If reservoir exceeds 150 psi, replace safety release valve (para 3-186).

Step 2.

Refer to malfunction 107, step 3.

2-300