BELT TENSIONER GP 4255542 - Caterpillar

order to find the cause of an engine overspeed shutdown, perform this procedure.
Check setpoints.This step checks setpoints P09 (ring gear teeth) and P10 (engine overspeed).
View the setpoints and note the setpoints P09 and P10. See Systems Operation, "Engine/Generator Setpoint Viewing OP2".
Compare the setpoints that are viewed with the specified setpoints of the particular generator set.Expected Result: The setpoint value that is viewed and the setpoint value that is specified should agree.Results:
OK - Proceed to 2.
Not OK - The setpoints do not agree. Reprogram setpoints P09, P10 and P14. See Systems Operation, "Engine/Generator Programming OP5". STOP.
Check for possible causes.
Check for the possible causes of the engine overspeed condition. Refer to the Engine Service Manual and/or the Governor Service Manuals.Expected Result: No cause should be found.Results:
OK - Proceed to 3.
Not OK - The cause is found. Repair engine components or replace engine components. If necessary, repair governor components or replace governor components. STOP.
Check the engine overspeed function.Note: Take precautions in order to stop the engine manually when you are performing this step.
When possible, disable the engine from reaching rated speed.
Turn the ECS to the OFF/RESET position and then turn the ECS to the START position.
Slowly increase the RPM to rated speed.Expected Result: The engine should not overspeed. The GSC should not shut down the engine. The GSC should not issue an overspeed fault.Results:
OK - The engine reaches rated speed, the GSC does not issue an overspeed fault and the GSC does not shut down the engine. The GSC and the system are functioning properly. Perform a verification of an overspeed. See Systems Operation, "Engine Setpoint Verification OP9". STOP.
Not OK - The engine overspeeds and the GSC issues an overspeed fault. Refer to the Engine Service Manual and/or the Governor Service Manual in order to find the cause of the problem. STOP.