2-15. PLACING VEHICLE IN MOTION (Contd)
(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-
Apply service brake pedal (6).
Release parking brake lever (4) by
pushing forward to the floor.
g. Engage transmission with
transmission shift lever (2).
Select 1-5 (drive) if operation
is on good roads and/or is on minimal
(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
(5) Select 1 (first) setting if
operation is under heavy loads, on
extreme grades, and/or is on rough
Release brake pedal (6) and depress accelerator pedal (5). Accelerate at a
safe, steady speed.
l Do not use hand throttle while driving. The hand throttle will not
disengage when brakes are applied.
Do not drive too fast for road or weather conditions! The maximum safe
speed limit for highway is 40 miles per hour. Do not tailgate. Always
maintain a safe following distance. Stopping the M939 family of vehicles can
be adversely affected by poor road/weather conditions, especially if your
truck is lightly loaded. Drive at a slower speed if conditions call for it. Death
or injury to personnel or damage to equipment may occur if excessive
braking is used under these conditions.
l Do not allow engine speed to exceed 2100 rpm in any
transmission gear ratio.
l Do not accelerate at full power when downshifting or upshifting to and
from forward driving range 1 (first).
Upshift or downshift transmission selector lever (2), as necessary, whenever
driving conditions change.