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

  TM-9-2320-272-10 - Page 263 of 481

TM 9-2320-272-10
2-156.6
Change 2
WARNING
Death or serious injury to soldiers, or damage to army equipment
will occur if the instructions in this procedure are not followed.
a. Payload.
WARNING
• Operation of 5,000-gallon semitrailers (M131 series,
M967/A1/A2, and M970/A1) can carry 5,000 gallons of fuel
(but not water) when towed with M931/A1/A2 or M932/A1/A2
tractors. This applies to operating on prepared surfaces, such
as paved, gravel, or dirt roads. Failure to comply may result
in damage to vehicle or injury or death to personnel.
• On cross-country terrain, payload is limited to 3,000 gallons
of fuel if the prime mover is an M931/A1/A2 or M932/A1/A2
series 5-ton tractor. Failure to comply may result in damage
to vehicle or injury or death to personnel.
• Liquid surge results from liquid’s movement in partially-
filled tanks, which may result in loosing control of 5,000
gallon fuel tankers causing vehicle damage, injury or death
to personnel.
b. Mountain Operations.
The general rule-of-thumb for determining proper gear range and speed is to
use the same speed descending a grade as the speed achieved ascending the grade.
A typical descent speed for this combination on a 9 percent grade should be limited
to 20 mph (32 km/h). The brake system provides more than adequate brake capacity
for safe mountain terrain operations, if properly operated and maintained.
c. Braking.
WARNING
Stopping distance is generally reduced by ABS technology. ABS
technology is designed to perform a conventional braking
technique called “stab” braking automatically using wheel
speed sensors. Drivers must understand they should not pump
the brakes on an ABS-equipped vehicle, as this will deactivate
the ABS. Drivers must also understand that by removing
pressure from the brake pedal, drivers can also deactivate the
ABS. Failure to comply may result in damage to vehicle or
injury or death to personnel.
2-26.2. OPERATION OF M931/A1/A2 W/ABS AND M932/A1/A2
W/ABS TRACTORS WHEN TOWING M131 SERIES,
M967/A1, M969/A1/A2, AND M970/A1 5,000-GALLON
FUEL TANKERS


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