SPACER 7N1796 - Caterpillar

Note: An engine overspeed condition is logged whenever this test is performed. The event requires a factory password in order to be cleared.Before performing an overspeed verification, use Caterpillar Electronic Technician (ET) to determine setting of the shutdown for the engine overspeed. Select the "Service" tab. Select "Monitoring System", and look at the "Engine Overspeed" and the "Engine Shutdown" setting. Refer to Illustration 1. In this example, the programmed setting is 2200 rpm.
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(1) Select "Monitoring System".
(2) Check the RPM settings. For this example, 75 percent of the programmed 2200 rpm is 1650 rpm. When you perform the overspeed verification, monitor the engine rpm in order to verify that the engine shuts down upon achieving 75 percent of the programmed value.Performing the Procedure with the Junction Box
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(3) Overspeed switch To set the overspeed verify feature, toggle the momentary switch for approximately one second. This will cause the overspeed shutdown to occur at 75 percent of the programmed overspeed setting.Note: The function of the toggle switch can be configured in Cat ET to function as an overspeed verify switch or as a torque limit switch. The factory default is the overspeed verify switch.Start the engine and monitor the engine rpm during acceleration in order to determine whether the engine shuts down at 75 percent of the programmed setting.Performing the Procedure with Cat ET
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(4) Double click on "Engine Overspeed Test"
(5) Select "Override Parameters". From the "Diagnostics" drop-down menu, select "Diagnostic Tests". Then select "Override Parameters". Then select the "Engine Overspeed Test".
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(6) Select "ON". Select "ON" and click "OK". Keep the screen for override parameters active. If you leave the screen for override parameters the parameter will automatically default back to the normal mode and the engine will not shut down at 75 percent of the programmed setting.Start the engine and monitor the engine rpm during acceleration in order to determine whether the engine shuts down at 75 percent of the programmed setting.