TM 9-2330-381-14
2-25.
HIGHWAY DRIVING (CONT)
WARNING
Using the M911 or M1070 tractor, semitrailer will not back like a normal semitrailer
because of semitrailer steering system. The operator must back tractor/semitrailer
by turning tractor steering wheel in opposite direction of what would be used for
backing with a normal semitrailer or injury to personnel and damage to equipment
may result.
CAUTION
When backing, excessively sharp, oversteered turns will cause damage to
equipment. If angle between tractor chassis and gooseneck exceeds 60, damage
to tires may occur. If a steering angle exceeds 90, severe damage to semitrailer
steering components and tractor fifth wheel will occur. Extreme caution must be
exercised when maneuvering tractor/semitrailer in confined spaces (i.e., motor
pools, parking lots, filling stations) where oversteer angles can easily be achieved
through normal driving capability of the tractor or severe damage to equipment will
result.
d. Backing with M911 or M1070 tractor. When backing, always use a spotter to guide you. Always use mirrors
when backing and keep spotter in sight at all times. When backing, rear of semitrailer will move in the same
direction as front tractor wheels.
(1) If tractor wheels are turned right, semitrailer wheels will steer left and cause semitrailer to back to the right
with the tractor.
(2) If tractor wheels are turned left, semitrailer wheels will steer right and cause semitrailer to back to the left with
the tractor.
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