The Case IH STX325 tractor primary air filter part number is AF25710. The inner safety filter is AF1632.
Case IH STX325 Air Filter Details
| Primary air filter part number | AF25710 |
|---|---|
| Inner safety air filter part number | AF1632 |
| Outer air filter part number | A44804 |
| Air filter dimensions | Outside diameter: 9.9 in | Inside diameter: 6 in | Height: 16.4 in |
| Cross-reference part numbers | STX325 |
Air Filter Service Interval Guide
Air Filter Service Interval Guide
Listed Filter Size Check
These are practical inspection/replacement guide ranges for the large ag tractor category. Dusty work can shorten the interval heavily, so use the restriction indicator and operator manual first.
Case IH STX325 Extra Air Filter Notes
| Engine displacement | 8.9 L | 543.1 cu in |
|---|---|
| Engine horsepower | 325 hp | 242.4 kW |
| Primary filter note | For the Case IH STX325, the listed primary air filter part number is AF25710. Match the number before buying because air cleaner setups can vary by engine, serial range and market. |
| Outer filter note | The listed outer air filter part number is A44804. |
| Safety filter note | The listed inner safety air filter is AF1632. Do not remove the safety element for normal cleaning; replace it if dirty, damaged or oil-soaked. |
| Fitment note | Listed dimensions: Outside diameter: 9.9 in | Inside diameter: 6 in | Height: 16.4 in. Use dimensions as a second check, not as the only buying method. |
| Filter size note | The listed dimensions point to a long element length at 16.4 in and large outside diameter at 9.9 in. Use that as a fitment sanity check against the old filter. |
| Power range note | Airflow demand rises with load. If the filter is undersized, damaged or badly seated, the engine can lose pull before the element looks completely plugged. |
| Engine airflow note | A similar horsepower rating does not guarantee the same filter if displacement or engine family changes. Use the engine data as a sanity check only. |
| Cross-reference note | Possible cross-reference numbers found for the Case IH STX325: STX325. Treat these as secondary checks after the primary filter number. |
| Service note | Clean loose dust from the air cleaner housing before pulling the filter. Never run the tractor with the filter removed, even for a quick test. |
Case IH STX325 Air Filter FAQs
Can the Case IH STX325 air filter become a restriction under load?
The combo is a practical warning system. If the element is packed, damaged or not sealing, the engine can lose airflow long before the filter looks catastrophic.
Why should I compare the old Case IH STX325 filter before buying?
Treat AF25710 as the hero value, not the whole truth. Serial range, engine swaps and different air-cleaner housings can beat a generic online listing.
What should I buy for a full Case IH STX325 air-filter service?
For a full parts check, separate the service element from the safety element: buy the outer/primary service element first, then buy the inner safety element only if it is dirty, damaged or due. Do not accidentally order A44804 when you meant the safety filter, or AF1632 when you meant the outer filter.
What do the Case IH STX325 air filter dimensions tell me?
The useful thing is the relationship between the three measurements: length checks housing depth, outside diameter checks the outer seal, and inside diameter checks the center opening. A filter can match two and still fail the third.
Would I be strict with the Case IH STX325 air filter condition?
Yes. The power-to-filter-size relationship makes restriction and seal condition worth taking seriously. Replace a questionable element before heavy dusty work.
How do I sanity-check a Case IH STX325 aftermarket air filter?
The cross-ref is helpful for aftermarket shopping, but the primary number and old element should still carry more weight.
How do the Case IH STX325 outer and primary filters differ?
Multiple numbers usually means a staged air cleaner. Replace the loaded outer element first, then inspect the safety element without exposing the clean intake to dust.
Mistakes do happen. Air filter specs can change by year, engine, serial range, market and air cleaner housing. Check the old filter, operator manual, parts book and official caseih.com website before ordering or installing an air filter.
