User Manual

read the automated transmission manual
included with your vehicle for instructions
on how to change shift configurations.
Controls for V
ehicles with an Eaton
Automated or a PACCAR
Transmission
This vehicle may be equipped with either
an Eaton Automated or a PACCAR
Transmission. The Automated or PACCAR
Transmission controls are located on the
right hand side of the steering column.
Auxiliary Transmission
If you have an auxiliary transmission, see
your transmission manufacturer’s manual
for its proper operation.
Steerable Drive Axle
NOTE
The customer cannot change axle ra-
tios
or tires without first obtaining ap-
proval from PACCAR. Contact your
nearest dealer.
Driver/Operator's Instruction Manual to
learn how to operate correctly
.
Hydraulic Brakes
WARNING
Do not operate the vehicle in the event
of
a malfunction in any air or hydraulic
circuit. Such a malfunction may pre-
vent the brake system from operating
properly, and could result in an injury
accident. The vehicle should not be
operated until the system is repaired
and both braking circuits, including all
pneumatic, hydraulic, and mechanical
components are working properly.
The operation of the vehicle's braking
system is based on the principle of
hydraulics. Hydraulic action begins when
force is applied to the brake pedal. This
force creates hydraulic pressure in the
master cylinder and is amplified with
assistance of a power booster
. The
supplemental boost in force is developed
when pressurized power steering fluid from
the steering pump presses on the master
cylinder piston. As a safety precaution, the
pressurized fluid from the master cylinder
has two mutually independent circuits. The
primary circuit supplies the front wheels
while the secondary circuit supplies the
rear wheels. The displaced fluid from the
master cylinder travels through brake pipes
terminating at the wheel cylinders which
actuate the brake pad mechanisms.
Actuation of these mechanisms force the
brake pads against the rotors to stop the
wheels.
A reserve electric motor pump provides a
redundant power source for the hydraulic
booster in the event normal flow from the
power steering pump is interrupted.
Manual braking is also available in the
event both the power and reserve systems
are inoperative.
WARNING
Never drive your vehicle with the park-
ing brake applied. Always release the
parking brakes prior to moving the ve-
hicle. Failure to disengage the parking
brakes prior to moving your vehicle
could result in excessive heat buildup
in the brake system, resulting in a fire.
Failure to comply may result in proper-
ty damage, personal injury, or death.
DRIVING - Hydraulic Brakes
If you have a Steerable Drive Axle installed
on your vehicle, refer to the auxiliary
transmission/transfer case manufacturer's
Y53-6113-1A1 (11/20) 133
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