Paccar 12-Speed, Руководство оператора

Страница: 21 / 45

NOTE
For optimal vehicle performance, it is
recommended the vehicle be operated
in “D” Drive mode.
Transmission Manual Override
If the vehicle is being back-driven and the
engine is approaching a higher than
normal RPM level, the transmission system
will override the MANUAL position and
perform an upshift.
NOTE
The transmission initiates upshifts
from MANUAL and LOW for engine
overspeed protection.
If the start gear is changed and it causes
the engine to lug at takeoff, the
transmission system will override the
MANUAL position and select the best
available gear.
Start-Up and Power Down
Start-Up
1. Ensure N , Neutral, is selected on
the Transmission Driver Interface
Device.
NOTE
The transmission will not allow the en-
gine to crank if a mode other than
Neutral is selected, on Transmission
Driver Interface Device, when attempt-
ing to start the engine.
2. Turn the ignition key to “ON” and
allow the PACCAR Automated
Transmission to power-up.
NOTE
Engine cranking is delayed until the
transmission power-up is complete
and the gear display shows a solid
N .
If Neutral, N , is not shown in the gear
display, ensure that the vehicle air sys-
tem is at normal operating range be-
fore attempting to start the vehicle.
3. Start the engine.
4. Allow vehicle air system pressure
to build to normal operating range.
5. Apply service brake.
NOTE
If the service brake is not applied while
selecting a starting gear, the initial
start gear will not be engaged and the
driver will have to reselect Neutral and
press the brake while re-selecting the
desired mode.
6. Select the desired mode and
starting gear on the Transmission
Driver Interface Device.
NOTE
The transmission will override inappro-
priate start gear selections to avoid
driveline damage.
7. Release the vehicle parking
brakes.
8. Release service brake and Urge to
Move will allow the vehicle to
DRIVING - Start-Up and Power Down
Y53-1272-1B1 (08/17) 19
2