lower half of the switch. Regen will be delayed until
the switch is no longer active.
Axle Switches
Differential Lock Switch
The differential lock switch provides maximum trac-
tion for slippery conditions by forcing the wheels on
each drive axle governed by the switch to rotate to-
gether. Engagement can be at any speed, provided
the wheels are not slipping or spinning. See
Fig. 5.8.
Interaxle Lock Switch
The interaxle lock, standard on all dual-drive ve-
hicles, is driver-actuated by means of a LOCK/
UNLOCK control valve switch. See
Fig. 5.8. A red
indicator illuminates when the interaxle lock is en-
gaged.
NOTICE
The interaxle lock should only be engaged when
the vehicle is moving slowly at low throttle. En-
gagement at high speed or power can damage
the axle(s).
Do not permit rear wheels to spin freely for more
than ten seconds when traction is lost. Shift into
LOCK to prevent damage to interaxle and main
differentials.
Engine Fan Switch
To turn the engine fan on, press the upper half of the
engine fan switch. See Fig. 5.9. The fan will continue
to operate for a set amount of time and then turn off
unless the coolant temperature is high enough to
continue fan operation. To turn the fan off before the
set time period ends, press the lower half of the
switch.
Hill Start Aid Override Switch
Some vehicles are equipped with a Hill Start Aid
(HSA) feature to prevent the vehicle from rolling
while on steep grades and to allow for a controlled
launch. HSA is active by default. It can be turned off
by pressing and releasing the HSA override switch
on the dash (see
Fig. 5.10).
1
2
3
4
01/05/2012 f611158
1. Interaxle Differential Lock Switch
2. Fifth Wheel Slide Switch
3. Rearmost Axle Differential Lock Switch
4. Air Suspension Dump Control Switch
Fig. 5.8, Axle and Suspension Switches
f61117804/24/2012
Fig. 5.9, Engine Fan Switch
Driver Controls
5.6
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