Damage Condition Possible Causes Countermeasures

When sudden overheating occurs during rotation, the bearing becomes discolored. Then, the raceway rings, rolling elements, and cage will soften, melt and deform as damage accumulates.

Poor lubrication
Excessive load (Excessive preload)
Excessive rotational speed
Excessively small internal clearance
Entry of water and debris
Poor precision of shaft and housing Excessive shaft bending

  • Study the lubricant and lubrication method
  • Reinvestigate the suitability of the bearing type selected
  • Study the preload, bearing clearance, and fitting
  • Improve the sealing mechanism
  • Check the precision of the shaft and housing
  • Improve the mounting method