RING-PISTON 4M8013 - Caterpillar

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Typical air shutoffs on a 3500B engine
(1) Air shutoffs
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Left hand side air shutoff in the OPEN position
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Right hand side air shutoff in the OPEN position
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.Engines That Are Equipped with ADEM II Engine Control Modules
Note: Do not start the engine. Ensure that the engine control is in the "OFF" position.
Ensure that both air shutoff gates are latched in the OPEN position and ensure that both air shutoff switches are connected. Turn on the power to the engine control panel. Both air shutoff gates should remain open. If both air shutoff gates do not remain open, check the wiring for the air shutoff switches.
With the power for the engine control panel in the ON position, activate the "EMERGENCY STOP" switch. Both of the air shutoff gates should close. If both air shutoff gates close, proceed to step 3. If both air shutoff gates do not close, check the wiring for the air shutoff switches and check the wiring for the solenoids. Activate the "EMERGENCY STOP" switch again. When both air shutoff gates close, proceed to step 3.
Turn the power to the engine control panel to the OFF position. Ensure that the "EMERGENCY STOP" switch is in the RUN position. Latch only the right side air shutoff gate to the OPEN position. Turn the power for the engine control panel to the ON position. The right side air shutoff gate should close. If the right side air shutoff closes, proceed to step 4. If the right side air shutoff gate does not close, check the air shutoff switch for the right side air shutoff and check the wiring for the right side air shutoff . When the right side air shutoff closes, proceed to step 4.
Turn the power for the engine control panel to the OFF position. Latch only the left side air shutoff gate to the OPEN position. Turn the power for the engine control panel to the ON position. The left side air shutoff gate should close. If the left side air shutoff gate closes the test is complete. If the left side air shutoff gate does not close, check the switch and the wiring for the left side air shutoff . Note: Testing is only complete when the engine successfully passes step 1 through step 4.
Operate the engine normally. Ensure that the air shutoff gates continue to be latched. Engines That Are Equipped with ADEM III Engine Control Modules
Note: Do not start the engine. Ensure that the engine control is in the "OFF" position.
Ensure that both air shutoff gates are latched in the OPEN position. Ensure that both air shutoff switches are connected. Turn the power for the engine control panel to the ON position. The air shutoff gates should remain in the OPEN positions. If the air shutoff gates do not remain in the OPEN positions, check the wiring for