TM 9-2320-363-10
2-41.
OPERATE IN MUD OR SOFT SURFACES.
NOTE
M915A2 is equipped with No Spin® automatic lock-
ing positive traction differential on the forward-rear
axle; all vehicles except M915A2 are equipped with
No Spin® on both rear axles. The No Spin® differen-
tial eliminates individual wheel spinout for better
traction.
When locking system is engaged, driving axles
receive equal torque.
a.
Before entering mud or other soft surfaces, check conditions and
select appropriate transmission gear range. LOCK (ENGAGE) interaxle lockout (all-
wheel drive). Enter soft area at a medium speed for gear range selected.
b.
For M917A1 and M917A1 w/MCS, select appropriate tire pressure
on CTIS selector panel (paragraph 2-17).
c.
Maintain steady pressure on accelerator pedal to keep vehicle rolling
until solid ground is reached. Do not accelerate to point where wheels spin and do
not stop, if possible.
d.
If vehicle gets stuck, try to pull out slowly in a low gear. Boards,
brush, or similar materials may be placed under tires to provide traction.
When resuming operation on highway surfaces, be sure
to reset CTIS selector panel to higher tire pressures.
Operating vehicle with underinflated tires will cause pre-
mature tire wear or damage to tires. Failure to follow
this warning may result in death or injury to personnel.
e.
If M917A1 or M917A1 w/MCS gets stuck, select emergency (EMER)
on CTIS selector panel to reduce tire pressures to 30 psi (207 kPa). Do NOT exceed
10 mph (16 kph). Operation in this mode is limited to 10 minutes unless reselected.
Reset to higher tire pressures when vehicle is freed.
f.
If M916A1 or M916A2 gets stuck and is not coupled to trailer, winch
may be used. Attach winch cable to another vehicle or heavy object that will not move
under load.
g.
When vehicle reaches hard surface, place interaxle lockout (all-
wheel drive) in UNLOCK (DISENGAGE) position.
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