Paccar TX-8, Operator'S Manual

Page: 21 / 48

• Pushing or pulling the lever will
briefly upshift or downshift the
transmission gear respectively
(about four seconds); after which,
the transmission will return to the
ideal gearing for the current vehicle
speed and engine use.
• Pushing and holding the lever
away will engage the LOW Mode
(see LOW Mode Operation).
When in Manual mode
• Pulling the lever towards the driver
will upshift (
+ ).
• Pushing the lever away will
downshift (
– ).
• Pushing and holding the lever
away will engage the LOW Mode
(see LOW Mode Operation).
The selected gear will appear beside the
transmission mode on the Transmission
Gear Display (see
Transmission Gear
Display on page 17 ).
Manual and Automatic Mode
Pressing this button places the
transmission in Manual mode. Manual
mode allows the operator to select the gear
(See
Upshifting and Downshifting on page
18 ).
To activate, put the gear selector in the
D
(drive) mode and then depress the Manual
Mode Button. When Manual mode is
selected,
M is shown in the Transmission
Gear Display (See Transmission Gear
Display on page 17).
Manual Mode
Use Manual mode when driving conditions
make it preferable to select a particular
gear instead of allowing the transmission to
select it automatically.
The operator manually selects the start
gear and uses the up/downshift request to
change gears. The system will hold the
current gear until another upshift or
downshift request is made, except when
the conditions for a
Transmission Manual
Override occur (see Transmission Manual
Override ).
NOTE
Multiple upshift or downshift requests
may be allowed when the up/downshift
request procedure is performed multi-
ple times in succession. Each push or
pull of the gear shift lever equals one
gear change request.
For optimal vehicle performance, it is
recommended the vehicle be operated in
Automatic mode.
Transmission Manual Override
If the vehicle is being back-driven and the
engine is approaching a higher than
acceptable engine operation range, the
INDICATIONS AND CONTROLS - Gearshift Lever
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