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 265 of 481
TM 9-2320-272-10
2-156.8
Change 2
e. Safe Operation.
1.
ABS allows the wheels to roll while the driver maintains full brake pressure
on the brake pedal. The rolling action helps to regain traction control (stability) on
the rear wheels.
2.
Because of vehicle’s high center of gravity and liquid surge, start, slow down,
and stop smoothly. If a quick stop is necessary to avoid a crash, maintain full brake
pressure.
3.
Know how much space is required to stop vehicle. More space may be
necessary to stop an empty tanker vehicle than a full tanker vehicle.
4.
Do not tailgate. Always maintain a safe distance from the vehicle ahead of
you. Drive far enough behind other vehicles to allow at least three vehicle lengths.
5.
Look far enough down the road to avoid unexpected obstacles and perform
necessary lane changes. At night, drive slowly enough to observe obstacles with
headlights, avoiding the need for sudden lane changes or abrupt stops.
f. Steering.
WARNING
• ABS technology is designed to maintain rolling traction and
steering. The rolling action may produce longer stopping
distances on some surfaces, such as freshly fallen snow or loose
gravel. The ABS steering advantage outweighs any braking
disadvantage on these surfaces. Evasive steering techniques are
designed to allow the driver to steer the vehicle clear of damage.
By maintaining a speed reduction without wheel lockup, ABS
increases steerability of the vehicle. The driver should use just
enough steering movement to adjust the vehicle to a clear space
on the roadway.
• Avoid steering more than necessary to clear an obstacle.
Oversteering may cause a skid, jackknife, or rollover. Failure to
comply may cause damage to vehicle or injury or death to personnel.
Slow down before curves, then accelerate slightly through the curve. Posted
speeds for a curve may be too fast for tanker vehicle.
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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