Discoloration
| Damage Condition | Possible Causes | Countermeasures |
| Discoloration of cages, rolling elements and raceway rings occurs due to their reacting with lubricant at high temperature. |
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Discoloration 1
Part: Inner ring of an angular contact ball bearingSymptom: Bluish or purplish Discoloration on raceway surface
Cause: Heat generation due to poor lubrication
Discoloration 2
Part: Inner ring of a 4-point contact ball bearingSymptom: Bluish or purplish Discoloration on raceway surface
Cause: Heat generation due to poor lubrication
