This outer air filter is the primary element in the engine intake system of a combine harvester. It captures airborne particulates before they reach the inner safety element and the turbocharger inlet. A restricted or damaged outer element forces the engine to draw air through the inner element alone, which reduces airflow and increases fuel consumption. Donaldson manufactures this filter to match the original housing seal geometry, ensuring the gasket seats correctly and prevents unfiltered air from bypassing the element. When replacing, inspect the housing sealing surface for debris and confirm the element is fully seated before closing the cover.