The Case IH Farmall 120M tractor primary air filter part number is 381423R92. The inner safety filter is 187472A1.
Case IH Farmall 120M Air Filter Details
| Primary air filter part number | 381423R92 |
|---|---|
| Inner safety air filter part number | 187472A1 |
| Outer air filter part number | Same as primary air filter |
| Air filter dimensions | Length: 16.4 in | Outside diameter: 9.9 in | Inside diameter: 6 in |
Air Filter Service Interval Guide
Air Filter Service Interval Guide
Listed Filter Size Check
These are practical inspection/replacement guide ranges for the row-crop tractor category. Dusty work can shorten the interval heavily, so use the restriction indicator and operator manual first.
Case IH Farmall 120M Extra Air Filter Notes
| Engine model | FPT 3.4L |
|---|---|
| Engine displacement | 3.4 L | 207.5 cu in |
| Engine horsepower | 120 hp | 89.5 kW |
| Primary filter note | For the Case IH Farmall 120M, 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 Farmall 120M appears to be the same listed item as the primary filter. |
| Safety filter note | The listed inner safety air filter is 187472A1. Do not remove the safety element for normal cleaning; replace it if dirty, damaged or oil-soaked. |
| Fitment note | Listed dimensions: Length: 16.4 in | Outside diameter: 9.9 in | Inside diameter: 6 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 | A dirty filter on this setup can show up as reduced pull, black smoke or higher temperature. That is more useful than staring at the hour meter. |
| 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. |
| 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 Farmall 120M Air Filter FAQs
What does the Case IH Farmall 120M 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.
How should I verify the Case IH Farmall 120M air filter before fitting it?
Do not buy from the title alone. Match 381423R92 against the removed filter, then check gasket shape, end-cap depth and cover fit before starting the tractor.
Is the Case IH Farmall 120M air filter a one-part or multi-part service?
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.
What do the Case IH Farmall 120M air filter dimensions tell me?
The useful thing is the relationship between the three measurements: length checks housing depth, outside diameter checks the outer seal, and inside diameter checks the center opening. A filter can match two and still fail the third.
Can a dirty air filter affect Case IH Farmall 120M performance?
A dirty filter on this setup can show up as reduced pull, black smoke or higher temperature. That is more useful than staring at the hour meter.
What does the outer-filter listing mean for the Case IH Farmall 120M?
In this listing, the outer and primary filter appear to be the same service element. That means the main outer element is the one you replace first while the inner safety element stays protected.
What is the biggest fitment trap with the Case IH Farmall 120M 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.
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.
