PREVOST H3-41 Manual page 49

detects a serious problem in the transmission, a
buzzing tone sounds for 5 seconds, and the
"CHECK TRANS" light on the dashboard (see
page 3-13) illuminates to warn the driver that the
transmission is held in gear.
depressed, the buzzing sound will continue until
the original range is selected.
Note :
As a light bulb and systems check, the
"CHECK TRANS" light will illuminate when the
ignition switch is turned to "ON". After about two
seconds the light will turn off. If the "CHECK
TRANS" light remains on, the self-diagnostic
system has detected a problem. If the problem
disappears, the light will go out, but a trouble
code will remain stored in the ECU.
Reverse (R)
Use this position to back up vehicle.
completely before shifting from forward to reverse
or from reverse to forward. Touch the reverse (R)
button, ''R'' will be displayed and the reverse
warning signal will be activated.
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 coach is left unattended. A
warning buzzer will sound if the engine is stopped
and the parking brake has not been applied when
foot pressure is removed from the brake pedal.
Caution :
Detroit Diesel engines should not be
idled for extended periods at "slow" idle.
extended idling, engine should run at "fast" idle.
Warning :
Always apply parking brake before
leaving driver's seat.
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, and
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.
Note :
allowed to shift itself, but manual shifting can be
If another is
used as described below.
Fourth (4) and Third (3) ranges
Select these ranges when driving on moderate
grades, or when load and traffic conditions
require the use of limited speed.
Second (2) range
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
Stop
downshift to first range.
progressively greater engine(*) and retarder(*)
braking power (the lower the range, the greater
the engine(*) and retarder(*) braking effect).
First (1) range
Select this range when pulling through mud and
snow, or when speed control is needed for driving
up steep grades.
maximum engine(*) braking power or retarder(*)
braking effect. In the lower ranges (1, 2, 3, and
4), transmission will not upshift above the highest
gear selected unless recommended engine
governed speed for that gear is exceeded.
Warning :
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 output retarder" options. See
pages 4-11 for details regarding both systems)).
This procedure keeps service brakes cool and
For
ready for emergency stopping.
Caution :
care must be taken that engine speed does not
exceed 2450 rpm.
3-25
CONTROLS & INSTRUMENTS
The transmission should normally be
Low ranges provide
This range also provides
Service brakes should not be used to
When descending in lower ranges,