Caterpillar 526-3122 NEW OEM Secondary Air Filter C2.4 C3.3B Mini Excavator 0820

Caterpillar OEM Secondary Engine Air Filter — Part Number 526-3122 Brand: Caterpillar (CAT) | Condition: New Old Stock (NOS)

You are purchasing a genuine Caterpillar OEM Secondary Engine Air Filter, part number 526-3122. This is an authentic factory original part — never installed, never used. As the last line of defense against dust, dirt, and contaminants, this secondary filter protects the engine while the primary filter is being serviced or in the event of a primary filter breach — a critical role in preventing costly engine damage.

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:

• Mini Hydraulic Excavators: 304, 305, 305 CR, 305.5 CR, 305.5 GC, 306, 306.5, 307, 307.5, 308, 308 CR, 308 SR, 308.5, 309, 309 CR, 310

• Skid Steer Loaders: 226D3, 232D3, 239D3, 249D3

• Compact Track Loaders: 239D3

• Engines: CAT C2.4, C3.3B

Part Number / Supersede Information:

• Primary OEM Part Number: 526-3122

• Also referenced as: 5263122, CA5263122

• Cross-Reference Numbers: JM-1100, FA1431

• 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.

Thank you for choosing QBS Parts Inc! We truly appreciate your business. If you have any issues whatsoever with your order, please give us the opportunity to resolve it before leaving feedback — we are committed to making every transaction a great experience.

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!