COOLING AR 2508282 - Caterpillar

Shutoffs
The shutoffs are electrically operated or mechanically operated. The electrically operated shutoffs are controlled by the Electronic Control Module (ECM).Shutoffs are set at critical levels for the following items:
Operating temperature
Operating pressure
Operating level
Operating rpm
Hydrocarbon build-upThe 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.
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 engineAlarms
The alarms are electrically operated. The operations of the alarms are controlled by the ECM.The alarm is operated by a sensor or by a switch. When the sensor or the switch is activated, a signal is sent to the ECM. An event code is created by the ECM. The ECM will send a signal in order to illuminate the lamp.Your engine may be equipped with the following sensors or switches:Intake manifold air temperature - The intake manifold air temperature sensor indicates high intake air temperature.Intake manifold pressure - The intake manifold pressure sensor checks the rated pressure in the engine manifold. Fuel rail pressure - The fuel rail pressure sensor measures the high pressure or low pressure in the fuel rail. The ECM will Check the pressure.Engine oil pressure - The engine oil pressure sensor indicates when oil pressure drops below rated system pressure, at a set engine speed.Engine overspeed - If, the engine rpm exceeds the overspeed setting the alarm will be activated.Air filter restriction - The switch checks the air filter when the engine is operating.User-defined switch - This switch can shut down the engine remotely. There will be no alarm or warning lamp to show that the switch has been operated.Water in fuel switch - This switch checks for water in the primary fuel filter when the engine is operating.Fuel temperature - The fuel temperature sensor monitors the pressurized fuel in the high-pressure fuel pump.Coolant temperature - The coolant temperature sensor indicates high jacket water coolant temperature.Note: The sensing element of the coolant temperature sensor 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.
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. The alarm will continue until the condition is corrected. The alarm may need to be reset.Aftertreatment System
Temperature Sensor before DOC
Two NOx Sensors
Two SCR Temperature Sensors
Ammonia SensorTemperature Sensor before DOC - This sensor monitors the gas temperature that is entering the DOCNOx Sensor - Two NOx sensors monitor the NOx concentration within the exhaust gas. One sensor before the DOC and one after the SCR module. SCR Temperature Sensors - The sensor monitors the gas temperature entering the SCR. Also, a second temperature sensor is located down stream of the SCR. This sensor checks the temperature