GEAR GP-RING 2172879 - Caterpillar

5N1955 ELECTRONIC SPEED SWITCH
1. Verify button. 2. Reset button. 3. "LED" overspeed light. 4. Seal screw plug (overspeed). 5. Seal screw plug (crank terminate). 6. Seal screw plug (oil step).Overspeed Verify Test
1. Run the engine at rated speed and push verify button (1) in for a moment. This will cause the speed switch to activate and shutdown the engine. Any time the engine speed is 75% or more of the overspeed setting, the engine will shutdown if the verify button is pushed.EXAMPLE: For an engine with a rated speed of 1800 rpm, the overspeed setting is 2125 rpm (see SPEED SPECIFICATION CHART and Note E). The overspeed verify test will shutdown the engine at 75% ( 25 rpm) of the overspeed setting of 2125 rpm. In this example, 75% of 2125 rpm is approximately 1600 rpm. If the verify button is pushed at an engine speed of approximately 1600 rpm or above, the engine will shutdown. The "LED" overspeed light (3) will come on and stay on until the reset button is pushed after an overspeed switch shutdown. To restart the engine, push in reset button (2) for a moment. This will reset the speed switch, and the "LED" overspeed light (3) will go off. The air inlet shutoff lever must now be manually reset before the engine can be started.NOTE C: To verify overspeed shutdown system operation, push in the VERIFY button for a moment. The ngine must shutdown at 75% or more of overspeed setting.NOTE D: Input Voltage: Maximum 40 VDC; Minimum 8 VDC.NOTE E: The engine overspeed setting rpm is 118% of rated engine rpm.