table 3.7 frequency of lubricating oil analysis inspection ... 6 months 3 months 1 to 3 months 5 bearing failures and solutions the bearing is ... generally usable up to the end of the rolling fatigue life if handled ... handling lubrication and/or mounting of the bearing it is sometimes difficult ... to determine the real cause of bearing failure because many interrelated ... possible to prevent the recurrence of similar problems by considering ... to the situation and condition of the machine on which the bearings ... conditions and surrounding structure of the bearings should be taken into ... consideration bearing failures are classified and illustrated ... figures 5.1 to 5.7 show the names of bearing parts referred to in the descriptions ... of the failure cases severe operating ...
and speckled speckles are clusters of tiny dents discoloration the surface ... color has changed cause ingress of foreign objects poor lubrication temper ... color by overheating deposition of deteriorated oil on surface speckles 1 ... in sealing efficiency 2 filtration of oil 3 improvement in lubrication system ... solution photo f-1 ¡inner ring of double row tapered roller bearing rct ... bearing ¡raceway surface is speckled ¡the cause ... is electric pitting photo f-2 ball of deep groove ball bearing ¡speckled all ... poor lubrication photo f-3 ¡outer ring of spherical roller bearing ¡partial oil ... on raceway surface photo f-4 ¡spherical roller bearing ¡discoloration of inner ... surfaces ¡the cause is deterioration of lubricant 14 ...