CONTROLS AND INSTRUMENTS
Diagnostic Display Mode
Pressing a second time on the "
" and " "
keys simultaneously will select the diagnostic
display mode. Refer to the Technical Information
chapter for more information about the WT
diagnostic codes. To exit diagnostic display
mode, press N button, or up and down arrow
keys at the same time.
Reverse (R)
Press the R button to select reverse. Stop
completely before shifting from forward to
reverse or from reverse to forward. The reverse
warning signal will be activated when this range
is selected.
Neutral (N)
Use this position to start engine. Select neutral
(N) when checking vehicle accessories and for
extended periods of engine idle operation;
parking brake must then be applied. The push-
button shifter will automatically select neutral
when the master switch is turned ON.
Note: The automatic transmission does not
have a park (P) position. Select neutral (N) and
apply parking brake when the vehicle is left
unattended. An audible alert will sound if the
engine is stopped and the parking brake is not
applied.
Warning: Always apply parking brake before
leaving driver's seat.
Caution: Detroit Diesel engines should not be
idled for extended periods at "slow" idle. For
extended idling, engine should run at "fast" idle.
Caution: Do not allow your vehicle to "coast" in
neutral. This practice can result in transmission
damage. Also, no engine braking is available in
neutral.
Drive (D)
Use this position for all normal driving
conditions. After touching this pad, the vehicle
will start in first or second range and will
automatically upshift to a higher range as output
speed increases. As the vehicle slows down,
output speed decreases, the transmission
automatically downshifts to the correct range. If
a locked brake or a slick surface condition
should occur, the ECU (Electronic Control Unit)
will command converter operation (disconnect
lockup) and inhibit downshifts for a period of time
or until normal wheel speed has been restored.
• First range (1):
Select this range when pulling through mud and
snow or when speed control is needed for
driving up steep grades. This range also
provides maximum engine braking power or
retarder braking effect. In the lower ranges (1,
2, 3 and 4), the transmission will not upshift
above the highest gear selected unless engine
overspeed is detected.
Note: The transmission should normally be
allowed to shift by itself, but manual shifting can
be done as described below.
• Second range (2)
Select this range when operating in heavy and
congested traffic. The transmission will start in
first and automatically upshift to second. When
slowing, the transmission will automatically
downshift to first range. Low ranges provide
progressively greater engine and retarder
braking power (the lower the range, the greater
the engine and retarder braking effect).
• Third and fourth ranges (3 and 4)
Select these ranges when driving on moderate
grades or when load and traffic conditions limit
speed.
Warning: Service brake should not be used to
control the speed of vehicle on long, steep
descents. Instead, lower transmission ranges
should be used (in conjunction with output
retarder. Refer to "JACOBS Engine Brake" and
"Transmission Retarder" headings in "Technical
Information" chapter for details regarding both
systems. This procedure keeps service brake
cool and ready for emergency stopping.
Caution: When descending in lower ranges,
care must be taken that engine speed does not
exceed 2,450 rpm.
TRANSMISSION OUTPUT RETARDER
The transmission output retarder is available
only with the Allison transmission.
The retarder can be operated using a hand lever
mounted on the steering wheel column or using
the service brake pedal.
To use the transmission output retarder, it must
be activated by pressing the appropriate rocker
switch on the dashboard.
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