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TM 5-4210-230-14&P-1
VEHICLE OPERATION
CAUTION
When parking your diesel vehicle the fol-
lowing procedures must be followed: Failure
to follow these procedures, could result in an
unattended vehicle moving, thus resulting in
personal injury or property damage.
When parking your Diesel vehicle, do not
leave transmission in gear; if vehicle rolls,
engine could start by heat of compression.
Use parking brake for parking on a grade,
block wheels or turn to curb.
FRONT AXLE (4x4)
Pushing the control forward engages the front axle.
Pulling the control backward disengages the front axle.
Neutral position is locked between the engaged and
disengaged position. When the front axle is engaged, a
"RED" light on the instrument panel will glow to alert the
operator.
CAUTION
To avoid personal injury or property damage
pay strict attention to the following:
Should it be necessary to operate the rear
wheels (with engine power) with the vehicle
stationary and the rear wheels raised from the
ground,
first
disengage
the
front
axle;
otherwise the driving front axle will pull the
vehicle off its support.
Parking brakes should be applied when the
transmission and transfer case have been left
in the Neutral Position with the engine running
or not running.
IMPORTANT
Do not keep the front axle engaged when
operating on DRY, HARD surfaced roads
EXCEPT where it is absolutely necessary to
operate with the transfer case in low range.
Operating on hard dry surfaces with both the
front and rear axle engaged creates a build up
of torque between the axles resulting in
excessive tire wear and strain on the entire
drive unit.
When necessary to operate with the transfer
case in low range, the front axle drive must be
engaged to avoid excessive torque load on
the rear axle.
FRONT AXLE DISENGAGEMENT (4x4)
The torque build-up between the front and rear axle
sometimes causes difficulty when disengagement of the front
axle is attempted while the truck is in motion.
To disengage the front axle with the truck in motion, it
is necessary to relieve the torque buildup between the front
and rear axle by either slacking off abruptly on the accelerator
and/or releasing the clutch while pressure is applied to the
front axle control.
In some instances it may be necessary to stop the
truck and move it slightly in the reverse direction before
disengagement of the front axle can be completed.
FRONT AXLE ENGAGEMENT (4x4)
The front axle can be engaged with the truck in motion
by pushing the front axle control forward to the "IN" position.
It is not necessary to stop the truck or to disengage the clutch
when engaging the front axle.
If difficulty is encountered in engaging the front axle
when the truck is not in motion, it means the splines on the
engaging clutch are not matched. Using forcing action or
kicking the control will not make it engage but may damage
the control linkage. Shift the transmission into low gear and
roll the truck forward, keeping the pressure under control.
When the splines are matched, it will engaged. It is easier to
engage the front axle with the truck in motion.
With automatic transmission, it may be necessary to
use a special procedure to shift out of neutral position in the
transfer case. The input shaft to the transfer case must be
stopped either by shifting between forward and reverse or by
stopping the engine. Keep pressure on the transfer case lever
as the input shaft approaches zero speed.
FRONT WHEEL LOCKING HUBS (4x4)
Locking hubs provide a means of controlling the
engagement of the front wheels with the front drive axle.
When engaged, full power is transmitted to both wheels.
Disengagement with front axle nor driving allows the front
wheels to "Free Wheel", and the axle shafts and differential
gears to remain idle, saving unnecessary wear.
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