3. Maintain the test speed (rpm). Press the “VERIFY”
button and hold the “VERIFY” button. The engine
should stop. If the engine does not stop at the
specified test speed (rpm), contact your Caterpillar
dealer.
Table 3
GENERATOR SET
OVERSPEED TEST RPM
Full Load RPM
Test RPM For Over-
speed
(1)
Actual RPM Of
Overspeed
(2)
1500 1328 1770
1800 1593 2124
(1)
The Test RPM for Overspeed is slower than the Full Load
RPM. Multiply the Full Load RPM by 0.885. The product is the
Test RPM.
(2)
Multiply the Full Load RPM by 1.18. The product is the Actual
RPM of Overspeed.
Note: The “OVERSPEED” lamp will illuminate as the
engine stops. Push the “RESET” button before you
restart the engine.
i00688850
Air Shutoff
SMCS Code: 1078
This optional solenoid is located on top of the engine.
The air shutoff is part of the air inlet system. When
the solenoid is activated, the solenoid mechanically
shuts off the inlet air to the engine. The solenoid can
be activated only by the overspeed switch or by the
emergency stop push button (ESPB). The Generator
Set Control (GSC) and the air shutoff must be reset
before the engine can be restarted. The cause of the
shutoff should be determined before the engine is
restarted.
i00705809
Fuel Shutoff
SMCS Code: 1259; 1704
The fuel shutoff solenoid is located on the governor
or the fuel shutoff solenoid is located on the fuel
injection pump. When the fuel shutoff solenoid is
activated, the solenoid moves the fuel rack “OFF” .
The fuel shutoff solenoid moves the fuel rack directly
or the fuel shutoff solenoid moves the fuel rack
through the governor.
i00689135
Overspeed
SMCS Code: 1900; 1907; 1912; 7427
Illustration 82 g00293335
(1) Magnetic pickup
(2) Flywheel housing
The magnetic pickup senses the passage of the teeth
that are on the flywheel ring gear. The Electronic
Overspeed Switch is set at 118 percent of the rated
engine speed. If the engine speed increases above
the overspeed setting, the magnetic pickup will sense
the overspeed. A signal is sent to the Electronic
Overspeed Switch. The Electronic Overspeed Switch
activates both the air shutoff solenoid (if equipped)
and the fuel shutoff solenoid.
The shutoffs must be reset before the engine will
restart. The air shutoff lever that is located at the top
of the air inlet housing must be manually reset. The
cause of the overspeed must be determined before
the engine is restarted.
SEBU7125-13
73
Operation Section
Air Shutoff
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