The Case IH STX430QT tractor primary air filter part number is 381423R92. The inner safety filter is AF1632.
Case IH STX430QT Air Filter Details
Primary air filter part number
381423R92
Inner safety air filter part number
AF1632
Outer air filter part number
Same as primary air filter
Air filter dimensions
Outside diameter: 9.9 in | Inside diameter: 6 in | Height: 16.4 in
Air Filter Service Interval Guide
Air Filter Service Interval Guide
Dusty use
100 hrs
Average
500 hrs
Light use
1,000 hrs
Listed Filter Size Check
Height
16.4 in
Outside diameter
9.9 in
Inside diameter
6 in
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 STX430QT Extra Air Filter Notes
Engine horsepower
430 hp | 320.7 kW
Primary filter note
For the Case IH STX430QT, the listed primary air filter part number is 381423R92. Match the number before buying because air cleaner setups can vary by engine, serial range and market.
Outer filter note
The outer air filter for the Case IH STX430QT appears to be the same listed item as the primary filter.
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
Use the power class to decide urgency. Higher airflow demand means less patience for questionable media, bad seals or packed pleats.
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 STX430QT Air Filter FAQs
How should I verify the Case IH STX430QT air filter before fitting it?
Treat 381423R92 as the hero value, not the whole truth. Serial range, engine swaps and different air-cleaner housings can beat a generic online listing.
Should I order one filter or a full Case IH STX430QT air-filter set?
For normal service, the primary/outer element is the one that does the dirty work. The inner safety element is backup protection, so replace it less often and keep it seated while cleaning the housing.
Why compare Case IH STX430QT 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 STX430QT 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.
Can I match a Case IH STX430QT air filter by size?
This looks like a large and deep element. Use the dimensions to reject obvious bad cross-references, especially if the inner diameter or seal lip does not match the removed element.
Can a similar Case IH STX430QT air-filter number still be wrong?
Part numbers are not keywords to approximate. One missing suffix can send you to a related filter that does not seal correctly.
Can the Case IH STX430QT lose power from a dirty air filter?
Use the power class to decide urgency. Higher airflow demand means less patience for questionable media, bad seals or packed pleats.
Official information note
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.
