PREVOST H3-41 Manual page 48

CONTROLS & INSTRUMENTS
The speed-warning light, located in the lower
section of the dial, is set by the adjusting screw
located in the left half of the tachograph body.
The speed at which the warning occurs is
displayed in a small window.
Odometer
The odometer registers the distance travelled
either in miles (US model) or kilometres.
Tachometer
Indicates the operating speed of the engine in
hundreds of revolutions per minute (rpm x 100).
The tachometer serves as a guide for gear
shifting, and helps prevent engine overspeeding
when going downhill with the Jacobs engine
brake operating. The maximum allowable
engine speed is 2,450 rpm.
Clock
The clock operates continuously, even if the
main battery disconnect switches are set to the
OFF position. To set the clock, open the
tachograph cover using the key provided, and
set the time using the thumb wheel on the L.H.
side of the tachograph.
Diagram Chart
The diagram chart recording speedometer and
tachometer data covers a 24-hour period. Open
the tachograph cover using the key provided,
then install/exchange the diagram chart with the
MPH or KM/H side facing up. Make sure the
chart is correctly positioned on the drive boss
before closing the cover.
CAUTION: TO PREVENT DAMAGE TO THE
MECHANISM, DO NOT RUN THE ENGINE
WITHOUT A DIAGRAM CHART OR WITH A
DAMAGED ONE INSTALLED IN THE
TACHOGRAPH. INSTALL A DUMMY PLASTIC
CARD (PREVOST PART NO. 59-0251) IF THE
COACH IS OPERATED WITHOUT A DIAGRAM
CHART.
3-21