Ball and Roller Bearings

Bearing Damage and Corrective MeasuresTable 16.1 Bearing damage, main causes of bearing damage and remedies for correcting the problemDescriptionCreepingSurface becomes mirrored by sliding of inside and outside diametersurfaces. May by accompanied by discoloration or score.Causes Correction¡Insufficient interference in the matingsection.¡Sleeve not fastened down properly.¡Abnormal temperature rise.¡Excessive loads.¡Reevaluate the interference.¡Reevaluate usage conditions.¡Review the precision of the shaft andhousing.¡Raceway end panel scuffingSpeckles anddiscolorationLuster of raceway surfaces is gone; surface is matted, rough, and / orevenly dimpled. Surface covered with minute dents.Causes Correction¡Infiltration of bearing by foreign matter.¡Insufficient lubrication.¡Reevaluation of lubricant type andlubrication method.¡Review sealing mechanisms.¡Examine lubrication oil purity. (filtermay be excessively dirty, etc.)PeelingPatches of minute flaking or peeling (size, approx. 10m).Innumerable hair-line cracks visible though not yet peeling.(This type of damage frequently seen on roller bearings.)Causes Correction¡Infiltration of bearing by foreign matter.¡Insufficient lubrication.¡Reevaluation of lubricant type andlubrication method.¡Improve sealing performance. (toprevent infiltration of foreign matter)¡Take care to operate smoothly.A-99