Rolling bearing failure index

Lubrication Failures

Lubrication failures index

5.1 Sliding contacts

Click on photograph to enlarge
	Figure 5.1a Wear of softer cage through loss of lubrication
	Figure 5.1b Cage wear
Main Characteristics	While in normal circumstances the loading at the cage contacts points is low, this changes if the bearing is misaligned. The overloading caused by misalignment is a common cause of cage wear and failure. The evidence of misalignment can frequently be found from track markings on the races.
Cause	In normal operation the loading at the sliding contacts between rolling elements and cage, or between race and cage with a race-centred cage, is low and lubrication requirements are modest. Wear occurs, however, if there is insufficient oil or the grease becomes hard through oxidation or loss of oil. Wear is normally confined to the softer cage (figures 5.1a, b).
Note
Possible Confusion with Other Types of Damage
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