Caterpillar OEM Secondary Engine Air Filter — Part Number 479-8991 Brand: Caterpillar (CAT) | Condition: New Old Stock (NOS)
You are purchasing a genuine Caterpillar OEM Secondary Engine Air Filter, part number 479-8991. This is an authentic factory original part — never installed, never used. Designed for CAT C7.1 and C4.4 engines, this secondary filter serves as the last barrier between contaminants and the engine during primary filter service or in the event of a primary filter breach — a critical safeguard for protecting expensive engine components.
Condition Details: This is a New Old Stock (NOS) part. The air filter itself is in new, uninstalled condition. As is common with NOS inventory, the original packaging may show signs of age, including shelf wear, dust, or minor cosmetic blemishes on the bag or box. The part is new and fully functional.
Compatible Models / Applications:
Excavators: 320, 320 GC, 323
Motor Graders: 120, 120 AWD
Engines: CAT C4.4, C7.1
Part Number / Supersede Information:
Primary OEM Part Number: 479-8991
Also referenced as: 4798991, CA4798991
Cross-Reference Numbers: SA 160067, SA160067, WA11220
Often sold as a kit paired with primary filter 479-8989
We recommend verifying current supersede numbers through your local Caterpillar dealer or the official CAT parts catalog prior to ordering.
Why Choose OEM Parts? OEM parts are engineered and manufactured to exact factory tolerances, ensuring a precise fit, reliable performance, and long service life. Unlike aftermarket alternatives, OEM parts are designed specifically for your equipment — no modifications, no guesswork.
Returns: We proudly offer hassle-free returns. If you are not completely satisfied with your purchase for any reason, simply open a return request through eBay within 30 days of purchase and we will take care of you promptly.
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Please verify fitment using your equipment's model and serial number before purchasing. Feel free to message us with any questions — we're here to help!
