The Case IH Farmall 120C tractor primary air filter part number is 381423R92. The inner safety filter is 187472A1.
Case IH Farmall 120C Air Filter Details
Primary air filter part number
381423R92
Inner safety air filter part number
187472A1
Outer air filter part number
187472A1
Air Filter Service Interval Guide
Air Filter Service Interval Guide
Dusty use
100 hrs
Average
400 hrs
Light use
800 hrs
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 120C Extra Air Filter Notes
Engine model
FPT 3.4L
Engine displacement
3.4 L | 207.5 cu in
Engine horsepower
117 hp | 87.2 kW
Primary filter note
For the Case IH Farmall 120C, 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 listed outer air filter part number is 187472A1.
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
Check the old filter, air cleaner housing label and parts book before ordering if the tractor has had an engine or intake-housing change.
Power range note
At this power level, a dirty filter can show up as weaker pull, smoke or higher heat under load. Use job conditions and the restriction indicator ahead of a fixed schedule.
Engine airflow note
A similar horsepower rating does not guarantee the same filter if displacement or engine family changes. Use the engine data as a sanity check only.
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 120C Air Filter FAQs
Which Case IH Farmall 120C 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 187472A1 when you meant the safety filter, or 187472A1 when you meant the outer filter.
How do I avoid buying the wrong Case IH Farmall 120C air filter?
The buying order should be: old filter number first, housing fit second, then cross-reference. Start with 381423R92, but do not ignore the a primary, outer and inner safety element setup.
Why not stretch a dirty Case IH Farmall 120C air filter under load?
At this power level, a dirty filter can show up as weaker pull, smoke or higher heat under load. Use job conditions and the restriction indicator ahead of a fixed schedule.
How can part-number style help check a Case IH Farmall 120C filter?
The main number 381423R92 should be treated as the control number. The other numbers need their own fitment checks, not blind substitution.
Why are there multiple air filter numbers for the Case IH Farmall 120C?
Use 187472A1 to check the service element and 187472A1 to check the safety element. Do not assume one substitutes for the other.
Can a Case IH Farmall 120C engine swap change the air filter?
Engine specs are useful when comparing similar models. If another tractor shares horsepower but has a different intake housing, the air filter may not interchange.
Does engine size prove the Case IH Farmall 120C air-filter part number?
A similar horsepower rating does not guarantee the same filter if displacement or engine family changes. Use the engine data as a sanity check only.
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.
