PUMP GP-UNIT INJECTION 1725780 - Caterpillar

Emergency Stop Control
The customer or the OEM is responsible for wiring the "EMERGENCY STOP" into the customer connection (J1) side of the ECM. Refer to the Troubleshooting Guide for more information.
Illustration 1 g00104303
Typical emergency stop switch
The "EMERGENCY STOP" switch is in the OUT position for normal engine operation. Push the "EMERGENCY STOP" switch to stop the engine in an emergency situation. The engine will not start when the button is locked. Turn the button clockwise in order to reset.Type 1
Illustration 2 g02504916
Air shutoff with the "STOP HANDLE" in the RUN position
Note: Refer to this Operation and Maintenance Manual, "Starting the Engine" for information about starting the engine after an emergency stop with this type of air shutoff.Test Using the "EMERGENCY STOP" Control
With the power for the engine control panel in the ON position, activate the "EMERGENCY STOP" switch. If the valve mechanism does not close, check the wiring for the air shutoff switch. Activate the "EMERGENCY STOP" switch again. Refer to the Troubleshooting Guide, "Air Shutoff System" information in your Service Manual for further information about the electrical system for the air shutoff system.Test Using the "STOP HANDLE" on the Air Shutoff
Move the "STOP HANDLE" counterclockwise until the handle reaches the stop in order to stop the engine.Type 2
To ensure that the air shutoff valve always shuts down when the engine ingests gaseous fumes, perform the test below at each oil change. A test failure can indicate wear in the block off plate to valve body interface and/or the bearing system.
Place engine at low idle speed. Ensure all accessories that are normally used for the application are in use, like a fan, or power takeoffs.
Actuate the air shutoff manually. On electrical operator air shutoffs, utilize an applicable power supply or jumper cables from the battery to energize the air shut-off solenoid. Ensure that the solenoid receives only a momentary signal to prevent overheating. On hydraulic operator air shutoffs, found on some hazardous location units, actuate by pulling the emergency stop handle.
Ensure that air shutoff was actuated and that the engine comes to a complete stop. Note: As every application has different parasitic loads and inertia, the duration for the problem to occur cannot be specified. However, if the engine stumbles or attempts to continue running, these symptoms may be an indication that worn components may need replacement.If additional help is needed, contact the Dealer Solution Network.
Actuating the air shutoff valve may result in oil leakage past the shaft seal in some cases. Repeated actuation of the air shutoff valve during loaded operation of the engine can result in mechanical damage to the turbocharger and reduce turbocharger life.