PLUNGER 1P1367 - Caterpillar

Shutoff and Alarm Systems
Shutoffs and alarms are electrically operated or mechanically operated. The operation of all electric shutoffs and alarms utilize components which actuate switches in a sensing unit.Shutoffs are set at more critical levels for the operating temperature, operating pressure, operating coolant level, and operating speed (rpm) than the alarms. The particular shutoff may need to be reset before the engine will start.
Always determine the cause of the engine shutdown. Make necessary repairs before attempting to restart the engine.
Table 1
MCSPK01 MCSPK02 Parameter Item Range Preset
X X Oil pressure lowlow shutdown Pressure switch 1 to 10 Bar 2 Bar
X Jacket water coolant temperature highhigh shutdown Temperature switch 70-120C 105 Deg C
X X Low coolant level alarm Liquid level switch n/a n/a
X X Fuel leak alarm Liquid level switch n/a n/a
X Oil filter differential pressure alarm Pressure differential switch 0.3 to 5 Bar 1.1 Bar
X Fuel filter differential pressure alarm Pressure differential switch 0.3 to 5 Bar 0.7 Bar
X X Overspeed shutdown Magnetic pickup see Table 2 see Table 2
X X Low oil pressure alarm Pressure transmitter 0 to 10 Bar 4-20 mA
X X High coolant temperature alarm Temperature transmitter 0-200 C 4-20 mA
X X High oil temperature alarm Temperature transmitter 0-200 C 4-20 mA
X X Low coolant pressure alarm Pressure transmitter 0 to 10 Bar 4-20 mA
X Low fuel pressure alarm Pressure transmitter 0 to 10 Bar 4-20 mA Be familiar with the following items:
Types and locations of shutoff
Conditions which cause each shutoff to function
The resetting procedure that is required to restart the engineAlarm systems consist of a sensor and a contactor. Examples of sensors are the magnetic pickup for detecting speed, and the pressure and temperature sensors. Sensors are wired to contactors. The contactors activate alarm circuits in the annunciator panel.Alarm systems are set at less critical levels than the shutoffs. The alarms warn the operator that an unsafe operating condition is occurring. The engine will continue to run when an alarm sounds.When an alarm is activated, corrective measures must be taken before the situation becomes an emergency in order to avoid possible engine damage. If corrective measures are not taken within a reasonable time, engine damage could result. Alternatively, a corresponding shutdown device (if equipped) will stop the engine. The alarm will continue until the condition is corrected or the alarm is reset by the operator.A switch may be installed in the alarm circuit for silencing the alarm while the engine is stopped for repairs. Before starting, be sure that the audio alarm is active. Be sure that the warning lamps will operate. The engine will not be protected if the audio alarm is silenced.
Always determine the cause of the engine shutdown. Make necessary repairs before attempting to restart the engine.
Fuel Shutoff Solenoid
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