Navistar WorkStar Series, Operator'S Manual

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Operation
The vehicle may need to be decelerated or turned once or twice
for the differential lock to fully disengage.
Controlled Traction Differential
Some Eaton drive axles are equipped with a controlled traction
differential. This is a differential assembly incorporating a friction
plate assembly designed to transfer torque to both rear wheels.
The unit is basically a multiple disc clutch designed to slip
above predetermined torque values.
This controlled slipping
characteristic at higher torque values enables the vehicle to
negotiate turns in a normal manner.
Resistance to slippage
at lower torque values enables the vehicle to maintain an
appreciable amount of tractive effort when one wheel encounters
relatively poor traction.
A control valve in the cab is actuated by the driver to engage and
disengage the controlled traction feature.
Disengaged, the axle has differential action all the time. One
wheel will spin independently of the other, if slippery conditions
are encountered.
Engaged, wheel slippage and spin-out are minimized.
CAUTION
Tire sizes on both rear wheels should be the same
on axles equipped with a traction equalizer. If
not, excessive wear may occur to the traction
equalizer.
Locking Differential (Optional)
WARNING
Axles equipped with locking differentials can
deliver power to both wheels even when only one
wheel is on the ground. To prevent unexpected
vehicle movement when servicing wheels, tires,
or brakes, turn engine off and raise all driving
wheels of locking differential equipped axle.
Failure to observe this warning could cause
the vehicle to move unexpectedly resulting in
property damage, personal injury, or death.
WARNING
To prevent vehicle damage, personal injury, or
death, pay strict attention to the following:
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.
The optional locking (limited slip) differential is designed to
function as a conventional differential during normal driving
conditions, and, when a loss of traction occurs at one wheel,
it will provide transfer of power to prevent that wheel from
spinning.
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