The Case IH STX450 tractor primary air filter part number is A44804. The inner safety filter is 222429A1.
Case IH STX450 Air Filter Details
| Primary air filter part number | A44804 |
|---|---|
| Inner safety air filter part number | 222429A1 |
| Outer air filter part number | 381423R92 |
| Air filter dimensions | Outside diameter: 9.9 in | Inside diameter: 6 in | Height: 16.4 in |
| Cross-reference part numbers | STX450 |
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 STX450 Extra Air Filter Notes
| Engine model | Cummins 14.9L |
|---|---|
| Engine displacement | 14.9 L | 909.3 cu in |
| Engine horsepower | 450 hp | 335.6 kW |
| Primary filter note | For the Case IH STX450, the listed primary air filter part number is A44804. 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 381423R92. |
| Safety filter note | The listed inner safety air filter is 222429A1. 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 | Use the power class to decide urgency. Higher airflow demand means less patience for questionable media, bad seals or packed pleats. |
| Engine airflow note | If a cross-reference is for a different displacement family, verify it hard before buying. Similar model names can hide different intake setups. |
| Cross-reference note | Possible cross-reference numbers found for the Case IH STX450: STX450. 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 STX450 Air Filter FAQs
How do I avoid buying the wrong Case IH STX450 air filter?
Use A44804 as the anchor number, then verify the old element and housing label. This is a letter-prefix part number, and the setup looks like a primary, outer and inner safety element setup, so one loose search result is not enough. The size data points to a large and deep element, so compare the removed element against both length and outside diameter before fitting.
Should I order one filter or a full Case IH STX450 air-filter set?
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 381423R92 when you meant the safety filter, or 222429A1 when you meant the outer filter.
Why compare Case IH STX450 horsepower with filter dimensions?
Comparing power and element size helps catch bad cross-references. A tiny replacement for a harder-working engine should make you suspicious before installing it.
Would I be strict with the Case IH STX450 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.
What size mistake should I watch for on a Case IH STX450 air filter?
A large and deep element can still have different end caps across brands. Use size to narrow the search, then use the part number and seal style to make the decision.
Why are there multiple air filter numbers for the Case IH STX450?
The presence of both outer and inner numbers means you should order carefully. A kit can be convenient, but only if it contains the correct service element and safety element.
How can part-number style help check a Case IH STX450 filter?
The main number A44804 should be treated as the control number. The other numbers need their own fitment checks, not blind substitution.
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.
