ABS lamp will not illuminate unless a compatible
trailer is connected to the tractor.
Vehicles with ABS may have Automatic Traction Con-
trol (ATC). On these vehicles, the ATC system auto-
matically limits wheel spin during reduced-traction
situations. In normal braking applications, the stan-
dard air brake system is in effect.
ATC includes a deep snow and mud option to in-
crease available traction on extra-soft surfaces like
snow, mud, or gravel. A rocker switch labeled ATC
will be located on the dash. Pressing the switch will
temporarily allow more drive wheel spin. The activa-
tion of the deep snow and mud option is indicated by
a flashing WHEEL SPIN lamp. Pressing the switch
again will shift the system back to normal operation.
NOTICE
The deep snow and mud option is intended to be
used under specific slippery conditions that re-
quire momentary increased wheel spin. Using
this option for an extended period of time may
damage the brake system.
Adjustable Steering Column
Controls
Adjust the seat to the desired ride position, then tilt
or telescope the steering column as needed.
To tilt the steering column, press down on the foot
pedal located on the steering column. Tilt the steer-
ing column up or down to the desired position. Re-
lease the foot pedal to lock the steering column in
place.
To telescope the steering column, press down on the
foot pedal located on the steering column. Pull the
steering wheel closer to you or push the steering
wheel away from you. Release the foot pedal to lock
the steering column in place.
Suspension Controls
Other right-hand control panel options are listed here
in alphabetical order.
Air Suspension Autofill Override Valve
The suspension autofill override option is a dash air
valve (
Fig. 5.32) that keeps the suspension deflated
when the ignition is turned off.
To prevent the suspension from filling automatically,
turn off the ignition and push the override valve in.
When the ignition is turned on, the override valve will
release automatically and the suspension will autofill.
Air Suspension Dump Control Switch
NOTICE
Do not operate the vehicle over uneven ground
such as ramps, speed bumps, curbs, etc. with
the air springs deflated. Doing this may lead to
air bag separation from the piston, preventing the
suspension air springs from reinflating.
The suspension dump switch is a two-position rocker
switch (
Fig. 5.33) that allows the air in the air sus-
pension to be quickly exhausted, lowering the rear of
the vehicle. This makes it easier to connect to, or
disconnect from, a trailer.
NOTICE
Never exhaust air from the suspension while
driving. When the air is exhausted, the suspen-
sion will not absorb road shocks and compo-
nents may be damaged.
To lower the rear of the vehicle, press the upper half
of the rocker momentarily. To raise the suspension to
its normal height, press the upper half of the rocker
again.
P
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S
H
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O
09/11/2007 f321102
Fig. 5.32, Suspension Autofill Override Valve
Driver Controls
5.13
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