Caterpillar — Engine Air Cleaner Service Indicator - Inspect

Maintenance

From a Caterpillar owner's manual covering: 1YG1-Up, 4CG1-Up, G3612, G3616. Check it applies to your exact model before use.

Applies to: Caterpillar G3612, Caterpillar G3616

Procedure

1. Observe service indicator. Clean or replace element when yellow diaphragm enters red zone, red piston locks visible, or restriction reaches 0.25 kPa (1 inch of H2O).
2. Inspect service indicator daily for cracks, holes, or loose fittings. Repair or replace as needed.
3. Test service indicator: check reset in less than three pushes.
4. Check movement of yellow core when engine accelerated to rated rpm. Should latch at greatest vacuum.
5. Replace service indicator if it does not reset easily or yellow core does not latch.
6. Inspect porous filter. Clean with compressed air or nonflammable solvent.
7. Replace service indicator annually and at overhaul. Tighten to 2 N·m (18 lb in).

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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