INTER-AXLE DIFFERENTIAL
An inter- axle differential is provided at the rear of the front
tandem axle. This unit divides input torque equally
between the front and rear tandem axles.
LOCK
position. Refer to previous heading for
procedure.
With vehicle
stopped
or traveling straight at a
constant speed
in proper gear range,
and no wheels
slipping,
move differential lock toggle to
LOCK
position.
Let up momentarily on accelerator to relieve torque on
gearing, allowing differential to fully lock.
When differential lock is
fully engaged,
the
indicator
light will glow.
When the differential is fully locked the vehicle will
have an
“understeer”
condition when making turns.
Proceed cautiously
over poor surface conditions.
NOTE:
Normally, differential lock will engage and
disengage immediately in response to
LOCK/UNLOCK
toggle. However differential “wind-up”, or misalignment
can delay engagement/disengagement. In this event,
reversing direction of travel and/or operation of steering
while traveling may relieve differential “wind-up”.
Indi-
cator light shows actual state of lock engagement/
disengagement.
Unlocking The Differential:
After poor surface condi-
tions have passed, do the following:
Move control toggle to
UNLOCK
position.
Let up momentarily on accelerator to relieve torque on
gearing, allowing differential to fully unlock.
When the differential lock is fully disengaged, the
indicator light will stop glowing.
With toggle in
LOCK
position, there is positive drive to the
front and rear tandem axles and either axle will drive up to
its maximum tractive ability without regard to the other
axle. Keep toggle in
LOCK
position when driving over
poor tractive conditions (mud, ice, snow or off-road
travel). Also use lock position for remote control travel.
The inter-axle differential may be locked when traveling
BUT NEVER
when wheels have lost traction and are
SPINNING.
The inter-axle differential is controlled by a toggle lever
mounted at the lower right portion of the dashboard.
With toggle in
UNLOCK
position, the front and rear
tandem axles are permitted to rotate at different speeds to
compensate for worn tires on one of the axles. Keep toggle
in
UNLOCK
position when driving on good tractive
conditions.
Differential Lock
The differential can be locked or unlocked when the
vehicle is standing still or at a constant low speed
when
wheels are not slipping.
When necessary, lock the differential and operate the
vehicle only at low speeds (
1st gear in Lo range
maximum).
will increase.
This condition is called “understeer”.
when operating vehicle with a locked differential.
Lock differential only when
maximum traction is
needed
on poor road or highway surfaces
or when
digging over the side.
Always unlock the differential
when need for
maximum traction has passed or when traveling on
good surface.
Do not lock differential when wheels are slipping.
Damage to the differential can result.
Do not lock differential
when the vehicle is traveling
down steep grades
and
traction is minimal.
Potential
loss of vehicle stability can result.
Locking The Differential:
When encountering poor
traction conditions, do the following:
NOTES:
The differential lock
can be engaged (locked)
ONLY
when the inter-axle differential has been
engaged
.
The differential lock is intended for use
ONLY
in
gear ranges LoLo 1, 2 and 3 and Lo 1.
Check to be sure inter-axle differential toggle is in
Serious damage will occur if inter-axle
differential is shifted while wheels are
SPINNING.
If shifting inter-axle differential while traveling, release
accelerator first to provide an interruption in torque to the
axles.
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