LED). To turn the axle shift off (switch from high
speed back to low speed), press the upper half of
the rocker again. When the axle has shifted speed,
the LED turns off.
When the panel lights are on, the AXLE SHIFT
legend is backlit in green.
IMPORTANT: The axle shift rocker switch is
guarded to prevent unintentional switch
activation. If the LED in the switch begins to
blink during normal operation, when the switch
has not been activated, this indicates an error
condition. Bring the vehicle to an authorized
Freightliner service facility as soon as possible.
When the axle shift switch is pressed, three
responses are possible: a normal response, a slow
response, and an abnormal response.
Normal Response: The LED in the switch blinks until
the axle shifts speed. At this point, the LED comes
on steady and stays illuminated. In normal operation,
the axle may shift so quickly that the blinking of the
switch is barely noticeable.
If operation of the switch is not possible for any
reason (interaxle lock is on, ignition is turned off,
etc.), the LED will stop blinking and turn off.
Slow Response: If operation of the switch is slowed
for any reason (by cold weather, low air pressure,
etc.), the switch will continue to blink until the axle
shifts. As in the normal response, the LED comes on
steady and stays illuminated.
Abnormal Response: If the LED blinks for more than
30 seconds, the axle shift function/mechanism may
not be operating correctly. Bring the vehicle to an
authorized Freightliner service facility for testing.
Axle Switch Interlock
NOTE: On vehicles with tandem drive axles,
there is an interlock that prevents an axle from
shifting speed whenever the interaxle lock is on.
If the axle shift switch is pressed when the interaxle
lock is on, the axle shift will not be completed. The
LED does the following:
•
If the LED is off, the LED comes on briefly and
turns off again.
•
If the LED is on, it stays on.
To complete the axle shift, turn off the interaxle lock
and press the axle shift switch again. If still needed,
the interaxle lock can then be reactivated.
Driver-Controlled Differential
Lock (DCDL)
The driver-controlled differential lock (DCDL) feature
(side-to-side wheel lock, traction control, or traction
equalizer) is available on vehicles with single- or
tandem-drive axles.
The DCDL provides maximum traction for slippery
conditions by forcing the wheels on each drive axle
governed by the switch to rotate together. When the
DCDL is engaged, the clutch collar completely locks
the differential case, gearing, and axle shafts
together, maximizing the traction of both wheels. Use
the DCDL if the interaxle lock does not provide
sufficient traction.
A status screen showing engaged locks is found in
the vehicle operations menus on the driver display.
See
Fig. 16.5.
Differential Lock Switch
Each differential lock is controlled by a switch on the
dash. See
Fig. 16.6.
DCDL Operation
WARNING
Locking the wheels when the vehicle is traveling
down steep grades or when the wheels are
slipping could damage the differential and/or lead
to loss of vehicle control, causing personal injury
and property damage.
10/26/2001
f610594
Fig. 16.4, Axle Shift Switch
Drive Axles
16.4
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