Peterbilt 579 - Switches

SWITCHES
3
SWITCHES
Dash Switches
This custom vehicle will have a wide
variety of switch controlled equipment.
However, this particular vehicle may
not have every switch identied in this
section of the operator manual.
Some air
device switches on the
dash may require that the vehicle
either be at a specic speed, park
brakes set or another device to be
on or off for the air device to operate.
Dash Switches
The instrument display will display
information regarding what needs to
change in order for the air device to
operate as expected.
Some of
these switches control air
system functions and may require the
vehicle’s ignition to be in the ACC
or ON position for switch to maintain
control via air pressure. If the switch
requires ignition power, it will allow that
air circuit to lose pressure (deactivate)
once the ignition is turned off. To
activate that function again, the ignition
needs to be turned to the ACC or ON
position and
the switch needs to be
re-engaged. Some of the switches that
control air functions will not disengage
when the vehicle ignition is turned off.
If the ignition is turned off, air pressure
will be maintained in the circuit for
that control switch. The few switches
that do not require ignition power are
described accordingly after the Dash
Switch table.
The Dash
Switch table provides a
complete list of icons that may be
found on the switch.
Symbol Name Symbol Color Standard Option
Page
1. Axle,
Diff-Lock - Dual
Amber
●
See Axle,
Diff-Lock - Dual on page 3-61.
2. Axle,
Diff-Lock - Forward Rear
Amber
●
See Axle, Diff-Lock - Forward Rear on page
3-61.
3-50 Y53-6047–2C (04/13)