forward axle is also transmitted straight through to
the rear axle, so both axles turn together at the same
speed. The LOCK position should be used when the
vehicle encounters poor traction conditions; however,
it also increases drivetrain and tire wear and should
be used only when improved traction is required.
Interaxle Differential Lockout Operation
To lock the interaxle differential and achieve maxi-
mum pulling power when approaching slippery or
poor road conditions, move the lockout control valve
to LOCK while maintaining vehicle speed, before en-
countering the poor road conditions. Let up momen-
tarily on the accelerator to engage the differential
lock. Proceed over poor road conditions with caution.
Do not wait until traction is lost and the tires are
spinning before locking the interaxle differential.
NOTICE
Do not actuate the interaxle differential control
valve while the tires are slipping. Do not operate
the vehicle continuously with the interaxle differ-
ential locked during extended good road condi-
tions. To do so could result in damage to the axle
gearing and excessive tire wear.
To unlock the interaxle differential, move the lockout
control valve to UNLOCK while maintaining vehicle
speed, after leaving the poor road conditions. Let up
momentarily on the accelerator to allow the shift,
then resume driving at normal speed.
Single Drive Axles with Traction
Equalizer
Some single drive axles are equipped with a traction
equalizer that is a load-sensing, self-actuating fea-
ture. A traction equalizer provides normal differential
action where traction is good. When one wheel be-
gins to spin faster than the other, clutch plates in the
differential housing automatically engage, delivering
power to both wheels. There is no operator control
with this feature.
NOTICE
Tire sizes on both rear wheels should be the
same on axles equipped with a traction equalizer.
If not, excessive wear may occur in the traction
equalizer.
DO NOT
ENGAGE
DURING
SPIN
OUT
LOCK UNLOCK
INTER
AXLE
DIFF
06/12/2007 f610952
Fig. 15.2, Interaxle Differential Control
Drive Axles
15.2
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