How to Maintain Bearings: Understanding the Importance of Secondary Seals

What is the purpose of the secondary seal in a bearing?

1) Heat
2) Lubricants
3) Contaminants
4) Seal springs

Final answer:

The secondary seal is used to keep contaminants out of the bearing. The correct option is 3.

Explanation:

The secondary seal is used to keep contaminants out of the bearing.

When it comes to bearings, it is crucial to protect them from any harmful substances that can impair their performance or cause damage. Contaminants such as dust, dirt, water, and other foreign particles can enter the bearing and create friction, corrosion, and wear. This can lead to premature failure and reduced lifespan of the bearing.

The secondary seal acts as a barrier to prevent contaminants from reaching the bearing. It is typically made of materials such as rubber or plastic and is designed to fit tightly around the bearing to provide an extra layer of protection. By keeping contaminants out, the secondary seal helps to maintain the integrity and functionality of the bearing.