1. Loud Metallic sound
Possible Cause :
- Abnormal load
- Incorrect mounting
- Insufficient or improper lubricant
- Contact of rotating parts
Measures :
- Improve the fit, internal clearances, preload, position of housing shoulder etc.
- Improve the machining accuracy and alignment of shaft and housing accuracy of mounting method
- Replenish the lubricant or select another lubricant
- Modify the seal etc.
2. Louder Regular Sound
Possible Cause :
- Flaws, corrosions, or scratches on raceways
- Brinelling
- Flaking on raceway
Measures :
- Replace or clean the bearing, improve seals and use clean lubricant
- Replace the bearing and use care handling bearings
- Replace the bearing
3. Irregular sound
Possible Cause :
- Excessive clearances
- Penetration of foreign particles
- Flaws or flaking on balls
- Improve the fit, clearance and preload
Measures :
- Replace or clean the bearing, improve the seal and use clean lubricant
- Replace bearing
To know more click on the below link ..
White Paper – Types of Noise related Irregularities, Possible Causes & Measures
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