the ATC system automatically limits wheel spin
during reduced-traction situations. In normal braking
applications, the standard air brake system is in
effect.
An additional solenoid valve is installed. During
reduced-traction situations, the ATC solenoid valve
controls air pressure to the modulator valves and
they in turn increase, hold, or reduce pressure to the
appropriate brake chambers to provide better traction
whenever wheel spin occurs.
When the ATC system is in the NORMAL mode, it
applies gentle braking to the spinning wheel, to feed
power to the wheel(s) with better traction. If both
wheels are spinning, the system signals the engine
to reduce power.
ATC includes a deep snow and mud option to
increase available traction on extra soft surfaces like
snow, mud, or gravel. A momentary contact rocker
switch labeled ATC is located on the dash. Pressing
the switch temporarily allows more wheel spin. The
activation of the deep snow and mud option is
indicated by a flashing WHEEL SPIN lamp. Pressing
the switch again cycles the system back to normal
operation.
NOTICE
The deep snow and mud option is intended to be
used under specific slippery conditions that
require momentary increased wheel spin. Using
this option for an extended period of time may
damage the vehicle brake system.
After the ignition switch is turned on, the TRACTOR
ABS lamp and the WHEEL SPIN indicator lamp
illuminate for about three seconds. After three
seconds, the warning lights go out if all of the
tractor’s ABS components are working.
IMPORTANT: If any of the ABS warning lights
do not work as described above, or illuminate
while driving, repair the ABS immediately to
ensure full antilock braking capability.
Brake Systems
11.9
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