Tandem Axle Power Divider Lock (Pdl) Control - International Trucks ProStar+ Series Operator's Manual

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 inter-axle
differential action, when backing under a trailer with a tractor,
starting on a slippery surface (poor traction), operating off
highway in mud, etc. (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 and costly repairs.
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
3878859R2
If you encounter wheel spin
letting off the accelerator will engage the differential lock. A
warning indicator on the instrument panel indicates when the
inter-axle differential is locked.
When highway conditions improve (good traction), the PDL
should be disengaged, again at a low, even speed. Letting
up on the accelerator momentarily will unlock the inter-axle
differential.
Tandem axle power dividers or inter-axle differentials
in the forward rear axle are controlled by the dash
mounted Power Divider Lock (PDL LOCK) switch.
The switch indicator will turn on when the PDL is
engaged (locked). The vehicle may be electronically
programmed to provide an alarm when a speed is
reached where it is not appropriate to have the power
divider locked. In this event, an alarm will sound (5 beeps) and
the switch indicator will flash slowly (once per second). A fast
flashing (twice per second) switch indicator signifies a problem
in the PDL system.
Under normal highway conditions (good traction), the PDL
should be disengaged, which allows differential action between
the forward rear axle and the back rear axle preventing inter-axle
differential wear due to unequally worn or mismatched tires, etc.
Operation
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