Peterbilt 579 Operator's Manual page 133

1. Axle Diff-Lock - Dual
Turn switch on to engage Front
and Rear Axle Diff Lock.
2. Axle Diff-Lock - Forward Rear
Turn switch on to engage Forward
Rear Axle Diff Lock.
3. Axle Diff Lock - Steer
Turn switch on to engage Front
Axle Diff Lock.
4. Axle Diff-Lock Rear Rear
Turn switch on to engage Rear
Rear Axle Diff Lock.
5. Axle Diff Lock - Single Rear
Turn switch on to engage Single
Rear Axle Diff Lock.
6. Axle, Inter-Axle Differential
Locked (Tandem)
Turn switch on to engage Inter-Axle
Differential Lock.
(04/13)
7. Axle, Two Speed
If equipped, the two speed axle
switch allows you to select axle high
and low ranges. The low range
(Off) provides maximum torque for
operating off-highway. The high
range (On) is a faster ratio for
highway speeds. This switch does
not require ignition power to maintain
the desired switch setting.
8. Batteries, Low Voltage
Disconnect (LVD)
If your vehicle is equipped with a Low
Voltage Disconnect (LVD) feature,
the LVD module is located inside the
driver's side kick panel.
9. Brakes, ABS Off-Road
Turn switch on to engage ABS
Off-Road mode. See Anti-Lock
Braking System on page 4-20.
10. Brakes, Parking Brake Valve
Pull yellow knob to activate parking
brakes. See Parking Brake Valve
on page 4-22.
Y53-6047–2C
SWITCHES
11. Cab Dimmer Switch
This switch is used to alter the
brightness of the instrument
panel lights.
12. Dump Truck Gate
Turn switch on to open Dump
Truck Gate.
13. Engine, Brake Level
In the up position there will be 100%
engine retarding. In the middle
position there will be 60% engine
retarding. In the down position there
will be 33% engine retarding.
For more information on when and
how to use the engine brake in your
vehicle, see the engine brake owner's
manual for additional engine brake
information.
14. Engine, Brake On/Off
Turn switch on to activate Engine
Brake system.
For more information on when and
how to use the engine brake in your
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