FILTER HOUSING O-RING FOR CASE IH 3147943R1

The 3147943R1 filter housing O-ring is designed for IH tractors Case , equipped with this assembly. Used on the housing that seals the filter, it helps ensure the assembly is leak-proof when reassembled. If you are looking for this part for maintenance or replacement, the part number 3147943R1 and the application on your tractor are the two key details to verify.

The Role of the O-Ring on the Filter Cover

An O-ring mounted on a filter housing is designed to ensure a tight seal between the housing and its mounting. When in good condition, it helps secure the assembly and minimizes contact issues that can arise with an old, flattened, or hardened seal.

On this type of part, wear is often caused by age, repeated disassembly, and prolonged compression. When a seal shows significant wear, has tears, or loses its flexibility, replacing it is a logical step during filter maintenance.

Part Number 3147943R1 and Applications Case, IH

This part number corresponds to a filter housing O-ring used on several IH Case tractors. Applicable models include the 33, 40, 43, 44, 45, and 56 series. Detailed model compatibility is listed immediately following this description, allowing you to verify exactly whether your tractor is included in the list.

For a sealing part, the part number remains the most reliable criterion. A removed seal rarely bears usable markings, and several seals may look similar while being intended for different applications. This is why identification by part number and tractor model remains the safest method.

Key factors for selecting this part

Before confirming your order, be sure to check the following first:

• the part number you’re looking for: 3147943R1;
• the installation location: the filter housing;
• the machine application: your IH Case l must be listed in the compatibility details below.

If your tractor has already been serviced, also compare the location of the old gasket after removal. This helps prevent confusion with another gasket in the filtration system. It is also best to verify the exact tractor model rather than relying solely on the series, as a similar designation is not sufficient to confirm proper installation.

Replacement During Filter Maintenance

This gasket is typically replaced when the filter housing is removed or when a leak develops around the assembly. A new gasket should be installed on clean, undamaged sealing surfaces, following the maintenance procedure specified for the machine.

If you need to identify the correct part for your Case, or IH tractor, refer to part number 3147943R1 and the detailed compatibility information that follows immediately after this description.

Compatibility by Make and Series

Case IH · 33 Series

• 433 533 633 733 833 933

Case IH · 40 Series

• 440 540 640 740 840 940

Case IH · 43 Series

• 743

Case IH · 44 Series

• 644 744 844

Case IH · Series 45

• 745 845

Case IH · Series 56

• 856 956

FAQ — Frequently Asked Questions

Where is O-ring 3147943R1 installed?

This O-ring is installed on the filter housing. It is positioned at the interface between the housing and its mounting to ensure the filtration assembly is sealed when reassembled. To avoid mistakes, make sure your repair involves the filter housing and not another seal in the system.

Is this O-ring intended for the IH 744 and 845 Case?

Yes, the IH 744 and 845 Case s are among the applications listed for this part number. The 744 is part of the 44 Series and the 845 is part of the 45 Series. However, please verify part number 3147943R1 on your old part or in your maintenance manual before ordering.

How do I identify the correct filter housing gasket before purchasing?

The first identifier is part number 3147943R1. Next, verify the location—it must be the filter housing—and then confirm that your IH Case tractor appears in the detailed compatibility list. If in doubt, also compare the overall shape and position of the old gasket you removed.

When should a filter housing gasket be replaced?

It is recommended to replace it when removing the filter housing or if you notice that the seal is flattened, hardened, marked, or causing a leak. A new seal helps ensure the assembly seals properly, provided that the sealing surfaces are clean and in good condition.

Original replacement part numbers and brand names are provided for comparison purposes only. This does not imply that these are original parts.