Note:
The sensing element of the coolant
temperature switch must be submerged in coolant in
order to operate.
Engines may be equipped with alarms in order to
alert the operator when undesirable operating
conditions occur.
NOTICE
When an alarm is activated, corrective measures
must be taken before the situation becomes an emer-
gency in order to avoid possible engine damage.
If corrective measures are not taken within a
reasonable time, engine damage could result. The
alarm will continue until the condition is corrected.
The alarm may need to be reset.
A switch may be installed in the alarm while the
engine is stopped for repairs. Before the engine is
started, ensure that the switch is moved to the ON
position and that the warning lights are flashing. The
engine will not be protected if the switch is left in the
OFF position.
Testing the Shutoff and Alarm
System
Most control panels are equipped with a lamp test
switch. Turn the switch to the ON position in order to
check the indicator lights for proper operation.
Replace faulty bulbs immediately.
NOTICE
During testing, abnormal operating conditions must
be simulated. Perform the tests correctly in order to
help prevent possible engine damage.
Refer to the Service Manual for more information on
testing procedures or consult your Perkins dealer.
i08681759
Fuel Shutoff
The fuel shutoff actuator is on the fuel injection pump.
When the fuel shutoff actuator is activated, the
actuator moves the fuel rack to the
“
OFF
”
position to
stop the engine.
Illustration 38
g01305771
Typical example
(1) Fuel shutoff actuator
An electronically controlled governor actuator (if
equipped) operates the fuel rack to reduce the fuel
delivery. The reduced fuel delivery will alter the
engine speed and also stop the engine.
i08657577
Overspeed
• 403EA-11
4000 Revolution Per Minute
(RPM)
• 403EA-11T Turbocharged engine
2850
Revolution Per Minute (RPM)
• 403EA-17
2600 Revolution Per Minute
(RPM)
• 404EA-22
3600 Revolution Per Minute
(RPM)
• 404EA-22T Turbocharged engine
3000
Revolution Per Minute (RPM)
42
M0132847