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 312 of 481

TM 9-2320-272-10
Change 2
2-203
CAUTION
Speed must be limited to 5 mph (8 km/h) in the emergency mode
to prevent damage to tires.
f.
Emer Mode.
When the mission requires maximum traction on extremely
adverse terrain, select emergency mode by depressing EMER (5) on the selector
panel (1). The dash-mounted amber warning light will illuminate. Operation in
emergency mode is limited to ten minutes. Then the system automatically inflates to
SAND (6); if the mission demands extended emergency mode use, select EMER (5)
as needed.
g.
Run Flat Mode.
When the mission requires operation with a punctured tire,
select run flat mode by depressing RUN FLAT (3) on the selector panel (1). Run flat
mode causes the CTIS to check tire pressure every fifteen seconds. Normally, checks
occur every fifteen minutes. Repeated damage detection results in repeated inflation
attempts. The punctured tire receives a new air supply each fifteen seconds.
Operation in the run flat mode is limited to ten minutes unless reselected. If no
longer required, press the RUN FLAT (3) selector a second time.
a.
General.
The operator must always be alert to changes in weather. The
operator must take care of assigned vehicle in order to prevent damage to vehicle
because of sudden changes in weather. The operator should be cautious when
starting or driving a vehicle that has not been operated for a long period. Lubricants
may thicken and cause parts failure. Tires may freeze to the ground, or may freeze
flat on the bottom, if underinflated. The operator should be alert to such possibilities
to prevent great damage to the vehicle.
b.
Before Operation.
(1)
Perform all before operation services listed in table 2-3, Preventive
Maintenance Checks and Services (PMCS).
(2)
Start engine coolant heater, if equipped, to warm vehicle coolant, engine,
and batteries before attempting to start engine. Refer to paragraph 2-45 for engine
coolant heater operating instructions.
c.
Starting Engine.
NOTE
Shut down engine coolant heater before starting vehicle engine.
2-32. OPERATING IN EXTREME COLD
2-31. CTIS OPERATION UNDER UNUSUAL CONDITIONS (Contd)


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