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Indentations

Indentations

Condition Cause Solution
  • Hollows in raceway surface produced by solid foreign objects trapped or impacts (False brinelling)
  • Ingress of solid foreign objects
  • Trapping of flaked particles
  • Impacts due to careless handling
  1. Keeping out foreign objects
  2. Check involved bearing and other bearings for flaking if dents are produced by metal particles.
  3. Filtration of oil
  4. Improvement in handling and mounting practices

Photo: Inner ring (cut off piece) of self-aligning roller bearing

  • Inner ring (cut off piece) of self-aligning roller bearing
  • Dents on one side of the raceway
  • The cause is trapping of solid foreign objects.

Photo: Rollers of spherical roller bearing

  • Rollers of spherical roller bearing
  • Dents on rolling contact surfaces
  • The cause is trapping of solid foreign objects.

Photo: Rollers of tapered roller bearings

  • Rollers of tapered roller bearings
  • Dents all over rolling contact surfaces. (Temper color at two ends.)
  • The cause is foreign objects carried by lubricating oil.

Photo: Inner ring of tapered roller bearing

  • Inner ring of tapered roller bearing
  • Dents on raceway surface
  • The cause is trapping of foreign objects.