Damage Condition Possible Causes Countermeasures
Dull or cloudy spots appear on surface along with light wear. From such dull spots, tiny cracks are generated downward to a depth of 5-10 μm. Small particles fall off and minor flaking occurs widely.
  • Unsuitable lubricant
  • Entry of debris into lubrication
  • Rough surface due to poor lubrication
  • Surface roughness of mating rolling parts
  • Select a proper lubricant
  • Improve the sealing mechanism
  • Improve the surface finish of the rolling mating parts

 

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Peeling 1

Part: Inner ring of a spherical roller bearing
Symptom: Rounded areas of Peeling
Cause: Poor lubrication

Peeling 2

Part: Enlargement of damage “Peeling 1”

Peeling 3

Part: Convex rollers of damage “Peeling 1”
Symptom: Rounded areas of Peeling on the center of the rolling surfaces
Cause: Poor lubrication

Peeling 4

Part: Outer ring of a spherical roller bearing
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Symptom: Peeling occurs near the shoulder of the raceway over the entire circumference
Cause: Poor lubrication

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