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TM 9-2320-270-10
Section IV. OPERATION UNDER UNUSUAL CONDITIONS
GENERAL
This section contains many of the unusual conditions you may have to deal with while oper-
ating the M911 Truck Tractor. Become familiar with this section and with referenced publi-
cations. FM 55-30 has information on driver selection and training for wheeled vehicles, and FM
21-305 gives basic instruction for operators of wheeled vehicles. Use the material in FM 55-30,
FM 21-305, and the guidelines in this section to help you operate the M911 Truck Tractor
under unusual conditions.
Page
Page
BeingTowed . . . . . . . . . . . . . . . . 2-123
Manually Releasing and Resetting
Extreme Cold Weather . . . . . . . . . . 2-112
Spring Brakes . . . . . . . . . . . . . . 2-122
Extreme Hot Weather . . . . . . . . . . . 2-111
Towing . . . . . . . . . . . . . . . . . . . 2-128
Fording . . . . . . . . . . . . . . . . . . . . 2-120
Unusual Terrain . . . . . . . . . . . . . 2-114
EXTREME HOT WEATHER
Watch and guard the M911 Truck Tractor against the following causes of overheating
Continuous high speed
Long hard pulls
Continuous use of high gears in steep grade and soft terrain.
Hot Weather Operation
1. Check transmission OIL TEMPerature gage (1) and WATER TEMPerature gage (2) for
signs of overheating. Upper limit of normal oil temperature is 220°F (104°C) and upper
limit of normal water temperature is 185°F (85°C).
2.
3.
Check cooling system, air cleaner, engine oil level, and radiator fins frequently, and
service as is necessary. Notify organizational maintenance of unusual gage readings end
other problems.
Check batteries daily and have serviced as required when operating in extreme heat.
Change 4
2-111
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