The Case IH Farmall 45A tractor primary air filter part number is 381423R92. The inner safety filter is 381423R92.
Case IH Farmall 45A Air Filter Details
| Primary air filter part number | 381423R92 |
|---|---|
| Inner safety air filter part number | 381423R92 |
| Outer air filter part number | Same as primary air filter |
Air Filter Service Interval Guide
Air Filter Service Interval Guide
These are practical inspection/replacement guide ranges for the utility tractor category. Dusty work can shorten the interval heavily, so use the restriction indicator and operator manual first.
Case IH Farmall 45A Extra Air Filter Notes
| Engine displacement | 2.2 L | 134.3 cu in |
|---|---|
| Engine horsepower | 45 hp | 33.6 kW |
| Primary filter note | For the Case IH Farmall 45A, 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 45A appears to be the same listed item as the primary filter. |
| 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 | 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 | This sits in the utility range. The 300-hour guide is useful for planning, but dusty work should shorten the inspection cycle. |
| Engine airflow note | Engine size is useful context for service urgency, not a license to ignore the part number. The canister and seal decide fitment. |
| 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 45A Air Filter FAQs
Is the Case IH Farmall 45A 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 makes the Case IH Farmall 45A air-filter number risky to order blindly?
Because this listing shows a primary/outer service element plus an inner safety element, the risk is ordering one correct number and one wrong companion element. Keep 381423R92 as the main reference, then confirm the other elements separately.
What symptoms point to air restriction on a Case IH Farmall 45A?
This sits in the utility range. The 300-hour guide is useful for planning, but dusty work should shorten the inspection cycle.
Why are there multiple air filter numbers for the Case IH Farmall 45A?
Primary versus outer is wording more than a separate part in this data. The safety element is the one that needs separate treatment.
Why is the exact Case IH Farmall 45A filter number important?
Part numbers are not keywords to approximate. One missing suffix can send you to a related filter that does not seal correctly.
Can displacement catch wrong Case IH Farmall 45A filter listings?
Engine size is useful context for service urgency, not a license to ignore the part number. The canister and seal decide fitment.
What does the Case IH Farmall 45A engine info tell me about the air filter?
Treat engine data as a second check. The primary filter number and old element should carry more weight.
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.
