Scratches between the flanges of rings and the side surfaces of the rollers
Possible reasons
·Poor lubrication
·Intrusion of foreign matter
·Skewing rollers caused by leaning
·Axial load too big leading to no lubricant on flange surface
·Roughness of the surface too big
·Big sliding of the rolling elements
Solutions
·Re-consider lubricant and lubricating method
·Check application method
·Set proper pre-load
·Reinforce the sealing function
·Use bearings correctly
