CATFilters

4L9851 Filter Element As-Air — Cat 320B 320C

This is a high-capacity air filter element engineered to protect engines from airborne contaminants. It is manufactured to meet exacting standards, providing superior dust and debris capture compared to a worn element that allows harmful particles into the combustion chamber. Operators may notice a loss of engine power, increased exhaust smoke, or rough idling when this filter begins to fail.

Filter Element As-Air – Part No 4L9851 – CAT Spare Part
Part Specifications
BrandCAT
CategoryFilters
ConditionAftermarket — OEM Specification
DispatchSame-day from Mumbai (before 3 PM IST)
GST InvoiceAvailable — all orders
Export DocsCommercial invoice, packing list, COO

Compatible Models

Always verify with serial number before ordering.

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Parts Trading Company  ·  Mumbai, Est. 1956  ·  Same-day dispatch  ·  Ships worldwide  ·  GST invoice included

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Installation & Application Notes

Never run an engine without a filter — even briefly causes abrasive damage. Pre-fill fuel filters with clean fuel before fitting to reduce prime time. Replace O-rings on filter housings every second service. Record change dates on filter housing.

Always consult the OEM service manual for model-specific torque values and procedures. WhatsApp our technical team if you need fitment guidance.

Part TypeFilter Element - Air
MaterialPleated paper media
ApplicationEngine air intake system
Service LifeReplace every 500 hrs or annually
CompatibilityCAT 320B, 320B L, 320B U, 320C, 320C FM
ConditionNew — CTP aftermarket replacement

Failure Symptoms

A restricted air filter may initially cause a noticeable drop in engine power, especially under load, and potentially increase exhaust smoke. If ignored, the engine may start to run rough, misfire, or experience increased internal wear due to ingested contaminants. Severe restriction can lead to engine damage and reduced operational efficiency.

Installation Tip

Ensure the air cleaner housing is completely clean and free of any debris before installing the new filter element. Make sure the new element seats properly and creates a good seal to prevent unfiltered air from entering the engine.

Service Note

Check the intake piping and turbocharger for any signs of oil leaks or excessive carbon buildup when replacing the air filter element.