371-1806 Air Filter Replacement for Caterpillar | Cross 10000-57057 / 7C1571

371-1806 Primary Air Filter — Manufactured in Our Bowei Filter Factory

The 371-1806 is one of the large-diameter primary intake filters we manufacture for customers operating Caterpillar generator and industrial engines.
This model uses a PU molded endcap, allowing the filter to be installed directly onto the engine’s intake system without requiring a separate air housing assembly. Many CAT generator engines adopt this direct-mount style to reduce vibration, simplify servicing, and improve sealing consistency.

High-Efficiency HV Filter Media

Since this filter is commonly used in CAT 3406B, C13, C15, C18, 3412C and 3512 engines, we build it using imported HV high-efficiency filter paper. HV media provides excellent dust-holding capacity and stable airflow during long-hour generator operation.

Benefits of HV media for generator sets:

• Higher initial filtration efficiency (better turbo protection)

• Longer service intervals in dusty environments

• More stable pressure drop during long runtime

• Better resistance to moisture and pulsating airflow

Before pleating, every batch of HV paper is tested for stiffness and moisture balance. After pleating, our QC team manually inspects pleat spacing and structural integrity.