The Case IH Magnum 385 tractor primary air filter part number is AF25238. The inner safety filter is 87409407.
Case IH Magnum 385 Air Filter Details
Primary air filter part number
AF25238
Inner safety air filter part number
87409407
Outer air filter part number
381423R92
Air filter dimensions
Length: 124 mm | Outside diameter: 124 mm
Cross-reference part numbers
CR319, 7/8
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
Length
4.9 in
Outside diameter
4.9 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 Magnum 385 Extra Air Filter Notes
Engine model
FPT 8.7L
Engine displacement
8.7 L | 530.9 cu in
Engine horsepower
385 hp
Primary filter note
For the Case IH Magnum 385, the listed primary air filter part number is AF25238. 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 87409407. Do not remove the safety element for normal cleaning; replace it if dirty, damaged or oil-soaked.
Fitment note
Listed dimensions: Length: 124 mm | Outside diameter: 124 mm. Use dimensions as a second check, not as the only buying method.
Filter size note
The listed dimensions point to a short element length at 4.9 in and normal outside diameter at 4.9 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
The displacement helps identify the engine family; horsepower tells you how hard it breathes under load. The element still has to match the canister.
Cross-reference note
Possible cross-reference numbers found for the Case IH Magnum 385: CR319, 7/8. 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 Magnum 385 Air Filter FAQs
Can the Case IH Magnum 385 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.
How do I avoid mixing up the Case IH Magnum 385 air-filter elements?
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 87409407 when you meant the outer filter.
What is the safest way to match a Case IH Magnum 385 air filter?
Treat AF25238 as the hero value, not the whole truth. Serial range, engine swaps and different air-cleaner housings can beat a generic online listing.
What do the Case IH Magnum 385 air filter dimensions tell me?
For this shape, do not eyeball it from a product photo. A close-looking element can be wrong if the seal sits at a different depth.
Would I be strict with the Case IH Magnum 385 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 a cross-reference filter fit badly on a Case IH Magnum 385?
Use the two cross-refs as alternate leads. If either one disagrees with AF25238 or the physical dimensions, ignore it.
What is the biggest fitment trap with the Case IH Magnum 385 air filter?
The trap is assuming a small-diameter, short element is close enough because it looks right online. The seal face, end-cap depth and cover pressure have to match, otherwise dust can bypass the media.
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.
