The Case IH Magnum 315 tractor primary air filter part number is 420539A1. The inner safety filter is 381423R92.
Case IH Magnum 315 Air Filter Details
Primary air filter part number
420539A1
Inner safety air filter part number
381423R92
Outer air filter part number
84191182
Air filter dimensions
Length: 181 mm | Outside diameter: 124 mm
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
7.1 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 315 Extra Air Filter Notes
Engine model
FPT 8.7L
Engine displacement
8.7 L | 530.9 cu in
Engine horsepower
312 hp | 232.7 kW
Primary filter note
For the Case IH Magnum 315, the listed primary air filter part number is 420539A1. 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 84191182.
Safety filter note
The listed inner safety air filter is 381423R92. Do not remove the safety element for normal cleaning; replace it if dirty, damaged or oil-soaked.
Fitment note
Listed dimensions: Length: 181 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 mid-size element length at 7.1 in and normal outside diameter at 4.9 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.
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 315 Air Filter FAQs
Which Case IH Magnum 315 air-filter parts should be changed together?
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 84191182 when you meant the safety filter, or 381423R92 when you meant the outer filter.
What does the Case IH Magnum 315 horsepower and filter size combo tell me?
Horsepower tells you airflow demand; length and outside diameter tell you rough element size. Together they say whether restriction is a service concern or mostly a fitment check.
What makes the Case IH Magnum 315 air-filter number risky to order blindly?
Use 420539A1 as the anchor number, then verify the old element and housing label. This is a mixed letter-and-number 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 mid-size element, so compare the removed element against both length and outside diameter before fitting.
What size mistake should I watch for on a Case IH Magnum 315 air filter?
Use the size to catch cross-reference mistakes. The filter still needs the correct end-cap and gasket style, not just similar length and diameter.
Would I be strict with the Case IH Magnum 315 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.
Why are there multiple air filter numbers for the Case IH Magnum 315?
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.
What symptoms point to air restriction on a Case IH Magnum 315?
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.
