PREVOST H3-45 - Page 73

Controls and Instruments 4-19
PA-1628Operator's ManualH3-45 COACH
Fast Idle
For extended idling periods, run the
engine at fast idle. Press down this
rocker switch to engage fast idle. This
increases the engine speed to
approximately 1,000 rpm. Return to
normal idle before driving or when
stopping the engine.
CAUTION
If the parking brake is released and/or
the transmission is engaged with the
engine running at fast idle, the engine
will return to normal idle and remain
there as long as the parking brake is
not applied and/or transmission is not
placed in neutral (n).
The engine will return to fast idle once
the parking brake is applied or neutral
(n) selected.
CAUTION
Return the engine to normal idle before
shutting the engine off.
Engine Brake (Optional)
The vehicle’s engine brake is by default
set to automatic (AUTO mode). On
vehicles equipped with this switch, it is
possible to disable the engine brake
(OFF mode).
From OFF or AUTO mode, the driver
can switch directly to Engine Brake
LOW or Engine Brake HIGH
mode by using the buttons on the
steering wheel. Refer to
"TRANSMISSION RETARDER" on
page25 & "ENGINE BRAKE" on
page25 in Section 5 Other Features.
The switch will have to be pressed
again to return to AUTO mode
(cycling the ignition will have the same
effect).
Engine Brake / Transmission Retarder
Use this switch to select between the
transmission retarder or the engine
brake when using the vehicle speed
retarding device switches on the
steering wheel. Neither system can be
in function at the same time. This rocker
switch is present on the dashboard, only
if the vehicle is equipped with both
systems. Refer to "TRANSMISSION
RETARDER" on page11 in this
section. Refer also to
"TRANSMISSION RETARDER" on
page25 & "ENGINE BRAKE" on
page25 in Section 5 Other Features.
Engine Stop Override (With Automatic Fire
Detection And Suppression System)
Press the Engine Stop Override switch
on the dashboard or the Delay Engine
Stop switch on the AFSS protection
panel to delay the engine shutdown and
extinguisher discharge by an additional
15 seconds.
CAUTION
Use this function if you are not
prepared to bring the vehicle to a safe
stop (i.e. on a railroad track, in
intersection).
This switch is functional only if the
vehicle is equipped with the Automatic
Fire Detection and Suppression System.
Driver Controlled Differential Lock (Dcdl)
(Optional)
Press this rocker switch to lock or
unlock differential action. Refer to "
DRIVER CONTROLLED
DIFFERENTIAL LOCK (DCDL)" on
page28 in Section 5 Other Features for
the complete operating instructions.