Damage Condition Possible Causes Countermeasures

Scoring is surface damage due to accumulated small seizures caused by sliding under improper lubrication or severe operating conditions. Linear damage appears circumferentially on the raceway and roller surfaces. Cycloidal shaped damage on the roller ends and Scoring on the rib surface contacting roller ends also occur.

Excessive load, excessive preload
Poor lubrication
Particles are caught in the surface
Inclination of inner and outer rings
Shaft bending
Poor precision of the shaft and

  • Check the size of the load
  • Adjust the preload
  • Improve the lubricant and the lubrication method
  • Check the precision of the shaft and housing