SEAL 5P1909 - Caterpillar

Emergency shutoff controls are for EMERGENCY use ONLY. DO NOT use emergency shutoff devices or controls for normal stopping procedure.
Ensure that any components for the external system that aid the engine operation are secured after the engine is stopped.Emergency Stop Button
Use of the emergency stop will shut off the fuel. The air shutoffs will also be activated. For operation of the emergency stop button, see the instructions that are provided by the OEM of the equipment.
Do not start the engine until the problem necessitating the emergency stop has been located and corrected.
It may be necessary to reset the emergency stop button before the engine can be restarted.If the emergency stop button is used, both of the air shutoffs must be reset before the engine can be restarted.The power for the ECM must be cycled before the engine can be restarted.Air Shutoffs
Illustration 1 g00751603Reset knob for the air shutoffThe air shutoffs are actuated by either electric current or oil pressure when energy to a solenoid is interrupted. Each air shutoff uses a moving plate to block inlet air to the aftercooler. The engine stops because of the restricted air supply to the combustion chamber. The air shutoffs will actuate for the following conditions:Note: A switch may be supplied by the customer in order to activate the air shutoffs.
The emergency stop button is pressed.
The air shutoff is activated.
An overspeed shutdown occurs.
The electronic control module loses power.The air shutoffs must be manually reset before the engine is restarted. To reset the air shutoffs, turn the reset knobs to the "OPEN" position. Ensure that both of the air shutoffs are reset.