freightliner 108SD - Interaxle Lock Operation

When the interaxle lock switch is pressed, three re-
sponses are possible:
•
Normal Response: The LED in the switch
blinks until the interaxle lock is engaged. At
this point, the LED illuminates steadily. In nor-
mal operation, the interaxle lock may engage
so quickly that the blinking of the switch is
barely noticeable.
If engagement of the interaxle lock mechanism
is not possible for any reason (ignition is
turned off, vehicle is moving too fast, etc.), the
LED will stop blinking and turn off.
•
Slow Response: If engagement of the interaxle
lock mechanism is slowed for any reason (by
cold weather, low air pressure, etc.), the switch
will continue to blink until the axles lock to-
gether, or for a maximum of 10 seconds. As in
the normal response, the LED illuminates
steadily once the lock mechanism is engaged.
•
Abnormal Response: If the LED blinks for more
than 30 seconds, the lock mechanism may not
be fully engaged/disengaged. Bring the vehicle
to an authorized Freightliner service facility for
testing.
Interaxle Lock Operation
NOTICE
The interaxle lock should not be engaged on a
vehicle with obviously spinning wheels. Engage-
ment at high speed or power can damage the
axle(s).
1.
With the engine running, press the upper half of
the interaxle lock switch to engage the interaxle
lock. Do not wait until traction is lost and the tires
are spinning before engaging the interaxle lock.
2.
If the vehicle is moving, briefly let up on the ac-
celerator until the interaxle lock engages. The
red interaxle indicator light illuminates on the
dash message center when interaxle lock is en-
gaged.
NOTICE
Do not operate the vehicle continuously with the
interaxle locked during extended good road con-
ditions. To do so could result in damage to the
axle gearing and excessive driveline and tire
wear.
3.
Proceed over poor road conditions with caution.
4.
Press the upper half of the interaxle lock switch
again to disengage the interaxle lock after leav-
ing poor road conditions.
NOTE: If the interaxle lock is engaged when the
engine is turned off, the interaxle lock will disen-
gage.
5.
If the vehicle is moving, briefly let up on the ac-
celerator to allow the interaxle lock to disengage,
then resume driving at normal speed. Once the
interaxle lock disengages, the indicator light will
go off.
10/26/2001
f610595
Fig. 15.4, Interaxle Lock Switch
Drive Axles
15.3