7. Ball bearing faults and their solutions - pollution issues

Apr 01, 2026

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Solid pollutants enter the bearing and form indentations on the rolling surface

Solid pollutants enter the bearing and form indentations on the rolling surface

Factors to consider during runtime:

►Pollutants can damage the bearing contact surface, increase noise and vibration levels. In some cases, it can also cause the temperature to rise.

 

Measures:
►Check the sealing device and confirm the following:
--Used the correct seal
--Sealed installation is correct
--Sealing without wear, damage, or lubricant leakage

 

►It may be necessary to shorten the interval for supplementary lubrication. Adding small amounts of new grease multiple times can help remove contaminated grease from bearings or bearing seats.

 

►Consider replacing open bearings with sealed bearings.

 

 

 

Solid contaminants remain in the bearing seat due to manufacturing processes or previously failed bearings

Solid contaminants remain in the bearing seat due to manufacturing processes or previously failed bearings

Attention should be paid to cleaning or installation, and the cleanliness of lubricants should be monitored:

►The indentation on the contact surface of the bearing may be caused by previous faults, wear of components such as gears, or contaminated lubricants leaving solid contaminants in the bearing seat.

 

►This situation can lead to an increase in temperature, noise, and vibration levels.

 

Measures:

►Clean all burrs to ensure smooth machining surfaces.

 

►Before installing a new bearing, thoroughly clean the bearing seat and its components.

 

►Ensure the use of clean, non polluting lubricants (grease containers should be sealed and stored correctly).

 

 

Liquid pollutants reduce lubricant viscosity

Liquid pollutants reduce lubricant viscosity

 

Attention should be paid to installation or lubrication, and focus on sealing aspects:

►Liquid pollutants can reduce the viscosity of lubricants, leading to contact between metal surfaces.

►In addition, it can also cause rusting of the bearing contact surface.

►These situations can lead to temperature rise, increased wear and tear, and increased noise.

 

Measures:
►Check the sealing of the bearing seat to ensure that they can effectively prevent liquid pollutants from entering. You can also consider using sealed bearings.

►It may be necessary to shorten the interval for supplementary lubrication. Adding small amounts of new grease multiple times can help remove contaminated grease from bearings or bearing seats.

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