The Case IH MX255 tractor primary air filter part number is P637255. The inner safety filter is 87682999.
Case IH MX255 Air Filter Details
Primary air filter part number
P637255
Inner safety air filter part number
87682999
Outer air filter part number
381423R92
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 MX255 Extra Air Filter Notes
Engine displacement
8.3 L | 506.5 cu in
Engine horsepower
262 hp | 195.4 kW
Primary filter note
For the Case IH MX255, the listed primary air filter part number is P637255. 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 87682999. 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
The horsepower and filter-size combo says this is not just a catalog lookup. If the tractor works in dust, restriction checks should happen earlier than the generic chart.
Engine airflow note
Displacement and horsepower together explain airflow demand better than either one alone, but the air-cleaner housing still proves fit.
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 MX255 Air Filter FAQs
Why should I compare the old Case IH MX255 filter before buying?
Treat P637255 as the hero value, not the whole truth. Serial range, engine swaps and different air-cleaner housings can beat a generic online listing.
Is the Case IH MX255 air filter a one-part or multi-part 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 381423R92 when you meant the safety filter, or 87682999 when you meant the outer filter.
Does the Case IH MX255 filter size look right for its horsepower?
The useful read is not the raw size by itself. Compared with the 262 hp engine class, the filter size looks reasonable for the power class, but dusty work can still load it quickly. Use that to decide how cautious to be in dusty work.
Which Case IH MX255 air-filter measurement matters most?
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.
What order should I check the Case IH MX255 air-filter elements?
Use 381423R92 to check the service element and 87682999 to check the safety element. Do not assume one substitutes for the other.
What is the biggest fitment trap with the Case IH MX255 air filter?
The trap is assuming a large and deep 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.
Can the Case IH MX255 lose power from a dirty air filter?
The horsepower and filter-size combo says this is not just a catalog lookup. If the tractor works in dust, restriction checks should happen earlier than the generic chart.
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.
