Health Factors Related To Bearing

Bearing Life

The life of a bearing is either defined as the number of revolutions, or the hours at some given constant speed; for which bearing runs before the first evidence of fatigue develops in the material of the races, rings or rolling elements.

Faulty methods of mounting, unsuitable fits, use of inferior lubricants, dirty surroundings etc. may result in the failure of the bearings before the calculated life. Such failure can be prevented by appropriated precaution during the design of the equipment (on which the bearing is to be fitted) by proper method of handling the bearing.

From the years of experience, it is observed that at least 90 % of the bearings, attain their calculated life, provided the bearing is properly fitted and maintained.


Cleanliness is very important to bearing maintenance and longevity. Cleanliness doesn’t just mean clean bearings. It means clean housings and shafts, clean tools, clean solvents and flushing oils. It also means putting bearings on a clean surface and using clean rags to wipe bearings.

Use any cleaning solution such as kerosene or mineral spirits rather than steam or hot water to avoid corrosion. Never wash or clean bearings in an enclosed area. Solvent fumes are toxic and explosive. Make sure that there is adequate ventilation and no open flame, welding or smoking in the area. Use rubber gloves to protect skin and safety glasses to protect eyes from the solvents.


Packaging is designed to protect bearings against dirt and moisture during shipping and storage. Don't try to open the package early let the package do its job, and leave replacement bearings in their original containers. Store them in a clean, dry area until ready for use. Strictly avoid temperature changes in your storage area it may cause condensation and damage the bearing.


Seals are vital to the performance of any bearing. Replace worn or damaged seals; they allow contaminants such as dirt and water to enter the bearing and they allow lubrication to escape. In most cases, it is good practice to replace all seals with new during tear-down. A film of lubricant should be applied to the seal lip contact surface at assembly. This will help prevent seal damage during installation and at initial start-up. It also will reduce rolling torque.


The less, the better. Fingerprints can cause rust, so handle bearings only when necessary. Never drop or handle these precision components roughly. Any sign of a bent cage renders replacement.


If you have any questions about the maintenance and handling of tapered roller bearings, contact to the service engineers of Bearings industry Technical team. They are experts in the use of bearing products, offering in-depth knowledge of bearing applications, design and operation, coupled with strict attention to the environments in which bearings will operate.

Bearing Maintenance

When handing bearings, Following are the right and wrong practices.


  1. Remove all outside dirt from housing before exposing bearing.

  2. Treat a used bearing as carefully as you would a new one.

  3. Work with clean tools in clean surroundings.

  4. Handling with clean, dry hands or better, clean canvas gloves.

  5. Use clean solvents and flushing oils.

  6. lay bearings out on clean newspaper.

  7. Protect dissembled bearings from rust and dirt.

  8. Use clean rags to wipe bearings.

  9. Keep bearings wrapped in oil poof paper when not in use.

  10. Clean inside of housing before replacing bearing.


  1. Don't work in dirty surroundings.

  2. Don't use dirty, brittle or chipped tools.

  3. Don't use wooden mallers or work on wooden bench tops.

  4. Don't handle with dirty, moist hands.

  5. Don't use gasoline's containing tetra-ethyl lead, as they may be injurious to health.

  6. Don't spin unclean bearings.

  7. Don't spin bearings with compressed air.

  8. Don't use cotton waste or dirty cloth to wipe bearings.

  9. Don't expose bearings to rust or dirt.

  10. Don't nick or scratch bearing surfaces.

  11. Warning:

    Never spin a bearing with compressed air. The force of the compressed air may cause the rollers to be expelled with great velocity, creating a risk of serious bodily harm. Proper bearing maintenance and handling practices are critical. Failure to follow installation instructions and failure to maintain proper lubrication can result in equipment failure, creating a risk of serious bodily harm. If a hammer and mild steel bar are used for bearing removal, fragments from the hammer, bar or bearing can be released with sufficient velocity to create a risk of serious bodily harm, including damage to your eyes.