Possible reasons
·Torque load too big
·High speed rotation or speed changing too frequently
·Poor lubrication
·Intrusion of foreign matter
·Vibration too big
·Bad mounting(mounting in leaning conditions)
·Abnormal increase in temperature(resin cage)
Solutions
·Check application conditions
·Check lubrication conditions
·Re-consider choice of cage
·Pay attention to applications
·Consider rigidity of shaft and bearing box
