Caterpillar — Air Shutoff - Test (ADEM II Engine Control Modules)
Testing & diagnosis · Air shutoff system
From a Caterpillar owner's manual covering: 3508, 3512, 3516. Check it applies to your exact model before use.
Applies to: Caterpillar 3508, Caterpillar 3512, Caterpillar 3516, Caterpillar 3508B engine
Before you start
- Check the wiring for the air shutoff switches, and for the solenoids
Procedure
- Do not start the engine; ensure engine control is OFF.
- Verify both air shutoff gates latched OPEN and switches connected.
- Turn panel power ON; gates should remain open.
- Activate EMERGENCY STOP; both gates should close.
- Reset; latch only right gate; power ON; right gate should close.
- Latch only left gate; power ON; left gate should close.
- Operate engine normally; ensure gates remain latched.
Full service-parts list: Caterpillar 3508 →, Caterpillar 3512 →, Caterpillar 3516 →, Caterpillar 3508B engine →
Source: Caterpillar owner's manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.