GEAR AS-PUMP 4779829 - Caterpillar

The Engine Monitoring System is not a guarantee against catastrophic failures. Programmed delays and derate schedules are designed to minimize false alarms and provide time for the operator to stop the engine.
Programmable Options and Systems Operation
Caterpillar provides a factory installed engine monitoring system. The system monitors engine oil pressure, coolant temperature, inlet manifold air temperature, and coolant level (optional device). Optional devices are installed by the vehicle Original Equipment Manufacturer (OEM). The monitoring system can be programmed to three different modes. These three modes of programming are the following modes: "Warning", "Derate" and "Shutdown". The coolant temperature sensor, the oil pressure sensor and the coolant level sensor (optional device) will operate in the engine monitoring mode that is selected.For example, if "Derate" was selected, the engine will derate engine power and vehicle speed. Sensors are used to detect the conditions that exceed acceptable limits.An excessive inlet manifold air temperature will not derate the engine. Also, an excessive inlet manifold air temperature will not shut down the engine."Warning"
The "DIAGNOSTIC" lamp and the warning signal (red lamp or buzzer) turn "ON" and the warning signal is activated continuously in order to alert the operator that one or more of the engine parameters is not within normal operating range."Warning/Derate"
The "DIAGNOSTIC" lamp turns "ON" and the warning signal (red lamp or buzzer) is activated. After the warning, the engine will derate rpm and power. The warning lamp will begin to flash when the derating occurs.When the engine is fully derated, the engine power is limited to 90 kW (120 hp). The vehicle speed is limited to 72 km/h (45 mph)."Warning/Derate/Shutdown"
The "DIAGNOSTIC" lamp turns "ON" and the warning signal (red lamp or buzzer) is activated. After the warning, the engine will derate rpm and power. The engine will continue to derate rpm until a shutdown of the engine occurs. The engine can be restarted after a shutdown for use in an emergency.A shutdown of the engine may occur in as little as 20 seconds. The engine can be restarted after a shutdown for use in an emergency. However, the cause of the initial shutdown may still exist. The engine may shut down again in as little as 20 seconds.If there is a signal for coolant loss, there will be a 10 second delay in order to verify the condition. The system will derate the engine rpm for 40 seconds before the engine will shut down if the engine has been programmed to shut down.If there is a signal for low oil pressure or for coolant temperature, there will be a two second delay in order to verify the condition. The system will derate the engine rpm for 30 seconds before the engine will shut down if the engine has been programmed to shutdown.
If the Shutdown mode has been selected and the warning indicator activates, engine shutdown may take as little as 20 seconds from the time the warning indicator is activated. Depending on the application, special precautions should be taken to avoid personal