Operation
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 such things as unequally worn or
mismatched tires.
Driver Controlled Differential Lock
The Differential Lock feature locks together the axle's
left and right axle shafts for improved traction on
reduced traction surfaces.
Some vehicles are equipped with this optional driver
controlled differential lock feature (DIFF LOCK). The
air actuated traction device can be manually shifted
from the vehicle cab. By actuating a switch, mounted
on the instrument panel, the driver can lock or unlock the rear
axle differential(s) when the vehicle is moving or stopped.
Other vehicles with tandem rear axles
(6X4)
are
equipped
with
two
optional
driver-controlled differential lock features
(DIFF FR AXLE / LOCK and DIFF RR AXLE
/ LOCK). The air actuated traction devices
can be manually shifted from the vehicle
cab.
By actuating the switches, mounted
on the instrument panel, the driver can independently lock or
unlock the forward-rear and / or rear-rear axle differentials when
the vehicle is moving or stopped.
When the differential is fully locked, the vehicle will have a slight
“under-steer” condition. This will increase the turning radius of
the vehicle.
On vehicles with multiple drive axles, the differential lock can be
used in conjunction with the Power Divider Lock (PDL) to achieve
maximum available traction in adverse road surface conditions.
To limit stress on the axle and tires during vehicle turning
maneuvers and improve stability, the use of the differential lock
must be limited to low vehicle speeds, under 25 mph (40 km/h).
Also, to maintain vehicle stability, the differential must not be
locked when the vehicle is traveling down steep grades and
traction is minimal. DIFF LOCK will automatically disengage
when vehicle speeds exceed approximately 25 mph (40 km/h).
Do not engage the locking differential when the tires are
spinning.
The vehicle may need to be decelerated or turned once or twice
for the differential lock to fully disengage.
165
Summary of Contents for ProStar+
Page 4: ......
Page 24: ...Foreword 12...
Page 38: ...Model Description 26...
Page 74: ...Controls Features Declination Zone Map 62...
Page 98: ...Controls Features Center Dash Panel Wing Panel 86...
Page 118: ...Controls Features 106...
Page 243: ...Maintenance Instructions 231...
Page 286: ...Maintenance Intervals and Specifications 274...
