Yanmar — Check for faulty part and repair.
A Yanmar service procedure — check it applies to your exact model before use.
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Procedure
- Air leak from discharge side of compressor
- Clogged air cleaner element e Wash or replace the element.
Source: manual:Yanmar-6LP-DTE-Service.pdf. Figures and steps are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.