PISTON GROUP 8N0841 - Caterpillar

Engines may be equipped with optional engine protective devices that are not included in this section. This section contains some general information about the function of typical engine protective devices.Alarms and shutoffs are electronically controlled. The operation of all alarms and shutoffs utilize components which are actuated by a sensing unit. The alarms and shutoffs are set at critical operating temperatures, pressures, or speeds to protect the engine from damage.The alarms function to warn the operator when an abnormal operating condition occurs. The shutoffs function to shut down the engine when a more critical abnormal operating condition occurs. The shutoffs help to prevent damage to the engine.Shutoffs may cause unburned gas to remain in the air inlet and in the exhaust manifold.
Unburned gas in the air inlet and exhaust system may ignite when the engine is started. Personal injury and/or property damage may result.Before starting an engine that may contain unburned gas, purge the unburned gas from the air inlet and exhaust system. Refer to the topic on purging unburned gas in the "Starting the Engine" section.
If an engine protective device shuts off the engine, always determine the cause of the shutoff. Make the necessary repairs before attempting to start the engine.Become familiar with the following information:
Types of the alarm and shutoff controls
Locations of the alarm and shutoff controls
Conditions which cause each control to function
Procedure for resetting that is required before starting the engineTesting Alarms and Shutoffs
Alarms must function properly to provide timely warning to the operator. Shutoffs help to prevent damage to the engine. Determining if the engine protective devices are in good working order during normal operation may be impossible. Malfunctions must be simulated to test the engine protective devices.
During testing, abnormal operating conditions must be simulated.The tests must be performed correctly in order to prevent possible damage to the engine.
Periodic testing of engine protective devices for proper operation is recommended maintenance. To prevent damage to the engine, only authorized service personnel or your Cat dealer should perform the tests.