GEAR SET-BEVEL 1120739 - Caterpillar

The Monitoring System monitors engine operating parameters. These parameters are stored in the memory of the Electronic Control Module (ECM). The parameters can be accessed on the Caterpillar Electronic Technician (ET). Go to the "Monitoring System" menu and activate the "Access service". The technician has the option of activating these monitoring system parameters. These parameters can be programmed in order to warn the operator of major problems that could develop in the operating system of the engine. The customer has the ability to program the trip points and the delay times for these parameters.If the Monitoring System detects a parameter that has exceeded a trip point, an internal timer will be activated. The parameter must fall to a specific value below the value of the trip point in order to reset the timer. The difference between the specific value and the value of the trip point is called the Hysteresis. If the delay time is exceeded the Monitoring System will initiate the programmed action. The Engine Monitoring System can initiate the following events: Warning, Derate and Shutdown. Not all of these events are available for each parameter. The engine monitoring system is enabled after the engine is started. When the engine is within 50 rpm of low idle, the ECM will check the parameters. The ECM checks for oil pressure after a 10 second delay. The delay is designed to eliminate false low oil pressure warnings.If the ECM generates an event, the event will be displayed as a "Status Flag" on the "Status" screen on the Cat ET. Go to the "Information" menu on Cat ET and activate the "Status" screen in order to see the active event. The event will be displayed across the top of the screen with the name of the ECM and serial number of the product.The Cat ET can be used to set the programmable limits of the parameters. To set the limits, go to the "Service" menu on Cat ET. Select "Monitoring System". The screen for the Monitoring System has the following four columns: Parameter description, State, Trip point and Delay time. The following list describes the four columns: Parameter description - The function that is being monitoredState - Programmed as ON, OFF or Always ONTrip point - Programmed limits for safe operationDelay time - Programmed time before action is taken.In order to change the programmed limit, highlight the action or delay time and press the "Change" button. If a password is required to change the limit the Monitoring System will ask for either a "Factory Password" or a "Customer Password". Refer to the diagnostic procedure Troubleshooting, "Factory Passwords" for information on passwords.Note: Use care when you program the trip point and the delay times. The ECM response must be correct for the application. If the legal range is not exceeded the engine monitoring system will accept any setting. Table 1 contains the parameters and the default limits for the Monitoring System.
Table 1
Engine Monitoring System
Parameter ECM Response Default Trip Point Default Delay