Damage status: present a dark side, with a mild wear dark surface by the surface of multiple deep down inside to 5 -
Tiny cracks of 10 m, and on a larger scale slightly off (
The tiny stripping)
Reason: the lubricant is not appropriate.
Foreign body into the lubricant.
Lubricant bad cause surface roughness.
Matching rolling parts surface finish is not good.
Measures: improve sealing device to improve matching rolling lubricant selection of parts surface finish.