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 206 of 481
TM 9-2320-272-10
Change 2
2-105
(2)
Depress lockout switch (1)
and place transfer case shift lever (3)
up to LOW range if vehicle is heavily
loaded, facing a steep grade, and/or
operating off-road.
e.
Apply service brake pedal (6).
f.
Release parking brake lever (4)
by pushing forward to the floor.
g.
Engage transmission with
transmission shift lever (2).
(1)
Select
1-5
(drive) if
operation is on good roads and/or is on
minimal grades.
(2)
Select
1-4
(fourth) setting
if operation is over moderately hilly
road grades and/or is on restricted
road speeds.
(3)
Select
1-3
(third) setting if
speed limits are low.
(4)
Select
1-2
(second) setting
if operation is over steep grades and/or
is on rough terrain.
(5)
Select
1
(first) setting if
operation is under heavy loads, on extreme grades, and/or is on rough terrain.
h.
Release brake pedal (6) and depress accelerator pedal (5). Accelerate at a
safe, steady speed.
WARNING
• Do not use hand throttle while driving. The hand throttle will
not disengage when brakes are applied. Failure to do this will
result in injury or death.
• Do not drive too fast for road or weather conditions. The
maximum safe speed limit for highway is 55 mph (88 km/h) for
vehicles equipped with Antilock Brake System (ABS) and
40 mph (64 km/h) for vehicles not equipped with ABS.
CAUTION
• Do not allow engine speed to exceed 2100 rpm in any
transmission gear ratio.
• Do not accelerate at full power when downshifting or upshifting
to and from forward driving range
1
(first).
i.
Upshift or downshift transmission selector lever (2), as necessary, whenever
driving conditions change.
2-15. PLACING VEHICLE IN MOTION (Contd)
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