Caution Systems; Operation - BRP Johnson J30TEL4SUA 2007 Service Manual

ENGINE CONTROL

CAUTION SYSTEMS

CAUTION SYSTEMS
There are three caution systems that alert the
operator when an abnormality occurs on the
engine:
•
Over-revolution caution system
•
Low oil pressure caution system
•
Overheat caution system
A caution lamp will be illuminated when an abnor-
mality occurs and the appropriate caution system
is activated.
On remote control models, a buzzer will also
sound for a low oil pressure or overheat caution.
To check the caution lamp (and the buzzer, on
remote control models), start the engine. Two sec-
onds after starting, the caution lamp should come
on (and, on remote control models, the buzzer
should sound).

Operation

Over-revolution Caution System
The over-revolution caution system is activated
when the engine speed that is calculated by the
power pack exceeds the preset maximum engine
speed setting.
Maximum Engine Speed Settings
30 HP
If the engine is operated above the maximum
engine speed setting for more than 10 seconds,
the engine speed will be automatically controlled
by ignition interruption and lowered to approxi-
mately 3000 RPM.
78
001668
6500 RPM
If the operator decreases the engine speed to less
than the maximum engine speed setting within 10
seconds, the over-revolution caution control will
be cancelled.
To cancel the over-revolution caution control when
it is activated only by excessive engine speed,
close the throttle to reduce the engine speed to
under 2500 RPM for one second.
Low Oil Pressure Caution System
The low oil pressure caution control is activated
when the oil pressure is at or below the preset
minimum oil pressure setting of 7 psi (49 kPa)
engine operation.
When the oil pressure is higher than the preset
minimum oil pressure setting, the oil pressure
switch is OFF (no continuity).
When the oil pressure is at or below the preset
minimum oil pressure setting, the oil pressure
switch is ON (continuity) and the low oil pressure
caution control is activated.
If the engine speed is over 3000 RPM, the over-
revolution caution control will be activated. The
engine speed will be automatically controlled by
ignition interruption and lowered to approximately
3000 RPM.
To cancel the low oil pressure caution control,
immediately stop the engine and check whether
the engine oil is at the correct level. Add oil, if
needed.
If the low oil pressure caution control is activated
and the engine oil is at the correct level, check for
an abnormal condition in the low oil pressure cau-
tion circuit, a leakage in the oil passages, and a
worn or damaged oil pump.
Overheat Caution System
The overheat caution system is activated when
the cylinder temperature sensor detects any of the
following conditions:
•
The cylinder wall temperature is at 208 to 230°F
(98 to 110°C) or higher.
•
The rate of the cylinder wall temperature varia-
tion within a given time exceeds the preset rate.