Peterbilt 579 - Operating the Transmission

OPERATING THE TRANSMISSION
4
OPERATING
THE
TRANSMISSION
Operating Hydraulic Clutch
(Manual Transmission)
Manual transmissions will also have a
clutch pedal situated to the left of the
brake pedal. Pressing down on the
clutch pedal will disengage the clutch
and will allow the transmission gears
to be shifted.
At the
beginning of the pedal stroke,
there will be about ½ inch (13 mm) of
movement before any resistance is
felt. As the pedal is pressed further, the
operator will feel increased resistance
as the clutch is disengaged. After
the clutch has been fully disengaged,
there will be another 1 - 1 1/2 inches
(25 -40 mm) of pedal travel which will
engage the clutch brake. At this full
stroke, the pedal will feel like it cannot
be pressed anymore.
If the
transmission is not shifting
smoothly into gear while the clutch
pedal is completely pressed to the
oor, then it is time to have the clutch
and hydraulic system inspected and
serviced.
CAUTION
Do not push the clutch pedal com-
pletely to the oor when shifting while
the vehicle is in motion. using the
clutch brake while shifting a vehicle in
motion will damage the clutch brake. A
non functioning clutch brake will make
shifting very difcult when the vehicle
is stationary.
If the clutch pedal is pressed
completely to the oor and the
transmission is not shifting, then it is
time to have the clutch adjusted or
serviced.
Operating Manual
Transmissions
The transmission shift pattern for
your vehicle may be located on the
shift control knob. In addition to
understanding the shift pattern and
its location, you should read the
transmission manufacturer’s manual
provided with your vehicle before
operating the vehicle.
4-14
Y53-6047–2C (04/13)