Metal O.D. wall type (with a reinforcing inner metal case) A final step in preparation for assembly is to lubricate the shaft, sealing lip and bore with sufficient oil. This will allow the oil seal to slide more easily over the shaft and prevent dry running after the first rotation. Always use oil or grease that is compatible with the oil seal material. In addition, when sliding over the shaft, the oil seal comes into contact with the keyway, threads and grooves. By taping or covering the shaft at the location of these irregularities with oil-soaked paper, the oil seal can be mounted without damage to the sealing lip.
3. Lubricate the Oil Seal
J: Additional code is added here as an identifier when two or more seals have exactly the same type codes and dimensional numbers.
Furthermore, the 30-50-10 oil seal is designed to withstand prolonged use and harsh operating conditions. This makes it suitable for a wide range of applications, including automotive, industrial, and agricultural machinery.
- Labyrinth seals
5. TYPES OF FLUID: Numerous oil seals can interact with oils, fuels, grease, water and more. However, know exactly what type of fluid the rotary shaft seal will be in contact with will ensure the longevity of the seal and the machinery.
Types Of Motor Oil

Figure 3: Sealing function of main lip radial load
* KOYO is a registered trademark of JTEKT.
Coat the sump flange with gasket-sealant and fit the flat parts of the gasket to it, ensuring that they are exactly positioned and joined.
Maintenance and Replacement of Oil Seals:
of the component due to extreme temperatures, causing premature deterioration of the oil seal material.
Ultimately, oil seals are devices that help to exclude dust and dirt, etc., while at all times retaining the lubricant in the piece of equipment.
3. Seal types and numbering system