SEAL-U-CUP 1672343 - Caterpillar

Introduction
The information in this section is a supplement to the troubleshooting methods of the previous section. This material is much more descriptive and detailed for the user who is less familiar with these components. The Troubleshooting Section makes constant references to this section when more detailed information is necessary to complete a diagnosis, or to calibrate or test a component.Service Procedure List
Service Procedure A: Overspeed Verify TestService Procedure B: Overspeed CalibrationService Procedure C: Crank Terminate Speed CalibrationService Procedure D: Oil Step Speed CalibrationService Procedure E: Magnetic Pickup CheckService Procedure F: Diode TestService Procedure G: Pressure Switch TestService Procedure H: Slave Relay TestService Procedure J: Water Temperature SwitchService Procedure K: Protection System Battery DrainService Procedure L: Air Inlet Temperature SwitchService Procedure A
7W2743 Electronic Speed Switch (ESS)
(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 cause engine shutdown. Any time the engine speed is 75% or more of the overspeed setting, engine shutdown will occur if the verify button is pushed.Example: For an engine with a rated speed of 1200 rpm, the overspeed setting is 1416 rpm (see 3500 SI SPEED SPECIFICATION CHART and Note A). The overspeed verify test will cause shutdown of the engine at 75% ( 25 rpm) of the overspeed setting of 1416 rpm. In this example, 75% of 1416 rpm is approximately 1062 rpm. If the verify button is pushed at an engine speed of approximately 1062 rpm or above, engine shutdown will occur.The "LED" overspeed light (3) will come on and stay on until the reset button is pushed after an overspeed switch shutdown. Before restarting 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 emergency stop switch (ES) must now be manually reset before the engine can be started againNOTE A: The engine overspeed setting rpm is 118% of rated engine rpm.NOTE B: To verify overspeed shutdown system operation, push in the VERIFY button for a moment. The engine must shut down at 75% or more of overspeed setting.NOTE C: The magnetic pickup frequency (Hz) is calculated as follows: NOTE D: Input Voltage: Maximum 40 VDC; Minimum 8 VDC. Service Procedure B
7W2743 Electronic Speed Switch (ESS)
(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 Calibration
1. Remove lockwire and seal from seal screw plugs (4), (5) and (6). Remove seal screw plug (4) from access hole for overspeed adjustment screw.2. Use a small screwdriver and lightly turn overspeed adjustment potentiometer twenty turns in direction Of "MAX ARROW" (clockwise). The overspeed adjustment screw is made so that it cannot cause damage to the potentiometer, or be