Paccar TX-18, Operator'S Manual

Page: 30 / 72

NOTE
If the engine does not crank at start-up,
confirm the following:
• Neutral is selected.
• The vehicle parking brake is ap-
plied.
• The service brake is depressed.
Drive Mode (Auto Mode)
Optimized Gear Selection automatically
selects the start gear depending on inputs
such as, load, grade, and axle/
transmission ratio. This start gear can be
changed by making an upshift or downshift
request, unless the start gear requested
would cause damage to the transmission
during vehicle launch.
NOTE
If the driver attempts to select a non-
neutral mode without applying the
service brake, the transmission will not
shift into gear. If this is attempted, the
driver will need to re-select Neutral
( N ), and then press the service brake
before a new mode can be selected.
If the start gear is changed using an upshift
or downshift request, the request will
remain the default start gear until the
vehicle is powered down or the selection is
changed; however, conditions such as
grade may still override the default start
gear selection.
A shift can be advanced by using an
upshift or downshift request when the
transmission is near the shift point.
NOTE
Multiple upshift or downshift requests
may be allowed when the upshift/
downshift request procedure is per-
formed multiple times in succession.
Each push or pull of the column shifter
equals one gear change request.
The transmission may also deny a shift
while ascending or descending grades if
the vehicle load and grade of the terrain, in
combination with the drivetrain ratio and
engine torque, will fall outside of the
acceptable range to perform a shift. If the
shift is denied, a tone will sound.
Reverse Mode
• Reverse mode selects the default
Reverse gear.
NOTE
If the driver attempts to select a non-
neutral mode without applying the
service brake, the transmission will not
shift into gear. If this is attempted, the
driver will need to re-select Neutral
(
N ), and then press the service brake
before a new mode can be selected.
• Each time Reverse is selected from
Neutral, the default Reverse gear is
engaged.
High-range Reverse (Pro Only)
Using High-range Reverse When
Stationary
1. Select Reverse ( R ) on the column
shifter.
2. Upshift repeatedly until R3
indicates on the transmission gear
display.
CONTROLS - Column Shifter
28 Y53-1349-1A1 (02/2022)
4