TM-9-2320-273-10

TRUCK, TRACTOR, LINE HAUL; LIGHT EQUIPMENT TRANSPORTER; TRUCK CHASSIS; MEDIUM EQUIPMENT TRANSPORTER

TECHNICAL MANUAL; OPERATOR’S MANUAL

DECEMBER 2012
TM-9-2320-273-10

  TM-9-2320-273-10 - Page 254 of 452

WOODS AND ROCKY TERRAIN
1. Ensure vehicle can clear ground obstructions such as stumps or rocks before
driving over them. Objects can damage components underneath vehicle. Avoid
hanging limbs which might cause damage.
NOTE
M915, M915A1, and M916 vehicles are equipped with a
spare wheel and tire assembly. M917 through M920 vehicles
are not equipped with a spare.
2. When driving over rocky terrain, there will be a greater chance of tire punctures.
Ensure a spare wheel and tire assembly is available.
END OF TASK
MUD OR OTHER SOFT SURFACES
1. Before entering mud or soft surfaces, check conditions and select the appropriate
transmission gear to allow vehicle through the area. Enter the soft area at a
medium speed for the gear you have selected.
2. Maintain steady pressure on accelerator pedal to keep your vehicle rolling until
solid ground is reached. Do not accelerate to the point of spinning the wheels.
3. If vehicle becomes stuck, try to pull out slowly in a lower gear. If necessary,
place boards, brush, or similar material under tires to provide traction.
NOTE
M916 and M920 vehicles are equipped with a winch.
Perform step 4 for self-recovery or to assist another stuck
vehicle using winch.
4. If vehicle is not coupled to a trailer, it may be possible to use the vehicle’s winch
for self-recovery or to assist in pulling another stuck vehicle out. Attach winch
cable to another vehicle or other stationary object that will not move under load
when pulling on it.
END OF TASK
SAND
NOTE
If operating the M915 through M920 or M915A1 in sand,
follow the guidelines in steps 1 through 4 below.
1. Maintain steady, even movement with the transmission in low gear. Keep vehicle
rolling without straining the engine and power train.
2. If vehicle becomes stuck, adjust tire pressure to gain additional traction. Reduce
pressure in the front tires to 50 psi (345 kPa) and reduce pressure in the rear tires
to 45 psi (310 kPa). When vehicle is free, inflate all tires to normal pressure.
3. If vehicle bogs down after reducing tire pressure, place boards, brush, canvas, or
similar materials under and in front of tires to provide better traction.
TM 9-2320-273-10
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