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Home›Repair guides›Caterpillar›Air Shutoff - Test (Engines with ADEM II ECM)

Caterpillar — Air Shutoff - Test (Engines with ADEM II ECM)

Testing & diagnosis

From a Caterpillar owner's manual covering: 3508, 3512, 3512B, 3516, 3516B. Check it applies to your exact model before use.

Applies to: Caterpillar 3508, Caterpillar 3512, Caterpillar 3512B, Caterpillar 3516, Caterpillar 3516B

Before you start

  • Do not start the engine. Ensure engine control is in OFF position.

Procedure

  1. Do not start engine. Ensure engine control is OFF. Latch both air shutoff gates OPEN.
  2. Turn ON engine control panel power; gates should remain open.
  3. Activate EMERGENCY STOP switch; both air shutoff gates should close.
  4. Reset switch to RUN. Latch only right side gate OPEN; turn power ON; right gate should close.
  5. Turn power OFF. Latch only left side gate OPEN; turn power ON; left gate should close.
  6. Testing complete only when engine passes steps 1 through 4.
  7. Operate engine normally; ensure air shutoff gates remain latched.

Full service-parts list: Caterpillar 3508 →, Caterpillar 3512 →, Caterpillar 3512B →, Caterpillar 3516 →, Caterpillar 3516B →

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.

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