Deformation by Misassembling Causes and Countermeasures

How: Incorrect mounting method and mounting tool defect may lead to an overload force between bearing rings and rolling elements. This will cause a certain indentation on bearing raceway and rolling elements surface.

Indentations on bearing raceway and rolling elements surface

Roundness measurement on bearing raceway (edge)
(Figure on the left side for outer ring and right one for inner ring.)

Countermeasures:
1. 1. Use appropriate methods for mounting bearings.
2. 2. Use appropriate tools as required.