Navistar WorkStar Series, Operator'S Manual

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Operation
Rear Drive Axles
Locking Differentials
WARNING
To prevent vehicle damage, personal injury, or
death, pay strict attention to the following:
If your vehicle is equipped with any type of
locking or limited slip differential, power will be
transmitted to the opposite wheel should one of
the wheels slip. Both wheels must be raised free
of the ground should it be necessary to operate
one wheel with the vehicle stationary; otherwise
the wheel that is not raised will pull the vehicle
off its support, possibly resulting in personal
injury or death.
Care should be taken to prevent sudden
accelerations when both drive wheels are on
a slippery surface. This could cause both drive
wheels to spin, and allow the vehicle to slide
sideways, resulting in loss of vehicle control.
Tandem Axle Power Divider Lock (PDL) Control
CAUTION
Do not operate the vehicle with the PDL engaged
on dry pavement (good traction) continuously.
This will result in excessive tire wear and
premature axle wear.
Never engage the PDL when the wheels are
spinning.
The PDL should be engaged, which prevents interaxle
differential action, when backing under a trailer with a tractor,
starting on a slippery surface (poor traction), operating off
highway in mud, (poor traction), or when traveling on slippery
highways (poor traction). Failure to lock the power divider under
these conditions may result in power divider failures.
If you
encounter wheel spin conditions, the PDL switch should be
moved to the LOCK position.
CAUTION
Engage the PDL only when stopped or moving at
low speed. Never try to engage the PDL while the
wheels are spinning, as this may result in shock
damage to the power divider components.
When encountering slippery highway conditions (poor traction),
the PDL can be engaged at a low, even speed. Momentarily
letting off the accelerator will engage the differential lock.
A warning indicator on the instrument panel gauge cluster
indicates when the inter-axle differential is locked.
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