TM-9-2320-272-10

TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)

TECHNICAL MANUAL; OPERATOR'S MANUAL

SEPTEMBER 2004

CHANGE 2

TM-9-2320-272-10 - Page 341 of 481

TM 9-2320-272-10

2-232

a.

General.

Fuel burning personnel heater provides heat and defrost to vehicle

cab when the engine is operating.

b.

Fuel Burning Personnel Heater Operation.

(1)

Shut off engine coolant heater if operating. Refer to paragraph 2-45 for

engine coolant heater shutdown instructions.

CAUTION

Do not operate the engine coolant heater control box and per-

sonnel heater control box at the same time. Electric

fuel pump will not maintain fuel pressure for both heaters at

same time.

2-44. FUEL BURNING PERSONNEL HEATER KIT

(2)

Open electric fuel pump shut-

off valve by turning valve lever (9) one-

quarter turn counterclockwise. Open two

valves (10) for M939A2 series vehicles.

(3)

Start engine. Refer to para-

graph 2-13 for cold weather starting

instructions if necessary.

(4)

Press PRESS-TO-TEST but-

ton (7) on personnel heater control box

(5) to check operation of circuit. Observe

that indicator lamp (7) illuminates.

(5)

Set HI-LO switch (6) on per-