Severe friction resulted in serious wear on the rolling contact surface of raceway and/or balls.
Possible Causes Insufficient lubrication Intrusion of foreign matter Improper installation (misalignment) Countermeasures Review the lubricant and lubrication method Improve the sealing capability Take measures against misalignment WearPart: Raceway of a Ball Slider
Symptom: Raceways are worn out
Cause: Insufficient lubrication that resulted from a clogged lubricant piping
Source: NSK