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-


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