SWITCH ASSEM. (reverse) 3P8990 - Caterpillar

Air shutoff valves must be tested and inspected to ensure proper operation.Inspect the air shutoff for damage of the following components that could prevent operation: housing, manual release knob, oil supply line, and switches. After inspecting the air shutoff, use Caterpillar Electronic Technician (ET) to trip the shutoff to ensure that the shutoff functions properly.
Start the engine and run at low idle. If the valve is hydraulically actuated, then perform air shutoff test at a minimum engine speed of 1000 rpm with no load on the engine.
Use Cat ET to override the parameters for the air shutoff and trip the air shutoff. Cat ET is the preferred method. If Cat ET is not available, the use of the emergency stop button is acceptable.
Inspect the air shutoff to ensure that the air shutoff has been tripped. The indicator on the air shutoff should point downward to the closed position. If the shutoff did not trip, see the Troubleshooting Guide.Note: Not to be used with butterfly valves.
Use a 1 inch wrench to reset the air shutoff by turning the operating shaft 180 degrees in the clockwise direction. Ensure that the arrow is pointing up to the open position.
Repeat Steps 1 through 4for a total of two successful tests.Note: Testing is only complete when the engine successfully passes all the steps. Reset the air shutoff valve to the open position and clean up any spills that may have occurred.