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This is the CAT Air Filter Secondary, part number 526-3123. An air filter secondary is a second stage of filtration in an engine's air intake, working alongside the main air filter to help keep dirt out of the engine. Ordering by the exact part number matters because air filters that look alike can differ in ways you can't see from the outside, and the part number is what ties this one to the right application.
| Brand | CAT |
|---|---|
| Part number | 526-3123 |
| Store SKU | 13280710 |
| Part type | Air Filter Secondary |
Machine models are not listed on this page. Check part number 526-3123 against the machine's parts book, or send the model and serial number through the quote form so the parts team can confirm.
Match part number 526-3123 to the parts book entry for your machine or to the number on the part you are replacing. If you cannot find a number, send the machine model and serial number through the quote form and the parts team will check it for you.
In general, a secondary air filter sits in the intake path as an additional stage of filtration beyond the main air filter. Its job is to help protect the engine from dirt that gets past the main filter or enters when the main filter is serviced.
Common signs include visible dirt loading or damage on the element, reduced engine power, excess exhaust smoke, and an air restriction warning on machines that have one. Dust found inside the intake after the main filter, or a secondary element that is dirty at service time, is also a reason to look closer. Follow the machine's service manual for inspection and replacement.
Have the part number (526-3123), the machine model and serial number, and the quantity you need. That lets the parts team confirm the part before it ships.
No. The store SKU (13280710) is RTL Equipment's own reference. The part number is 526-3123, and that is the number to use when checking a parts book or cross-checking against your old part.
