Damage status: bite into a tiny metal powder, foreign bodies, such as on the raceway surface or rotating the dent.
Due to impact, such as installation on the roller spacing interval to form the concave (
Brinell hardness indentation)
The metal powder and other foreign body nip.
Assembly or transport process under impact load is too big.
Improve the sealing device.
Filter the lubricating oil.
Improve assembly and method of use.