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Dear Lux,

Very interesting case of failure of bearing,

analyzing of evidences:

1.- Only one ball was damaged.

2.- The location of failure in inner face of thrust bearing.

possible causes,

1.- Not enough axial play during bearing Installation, that's mean the bearing was preloaded axially.

2.- Bad quality of bearing, it is possible to find fakes bearing  in market.

3.- Excessive axial load due to coupling pre-stretch.

Lack of thrust bearing temperature reading, was a factor that early action were not taken.



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