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Care and Maintenance of Bearings
Electrical Pitting Home >> Technical Support >> Care and Maintenance of Bearings
Condition Cause Solution
Surface is speckled visually and the speckles are clusters of tiny pits when viewed through a microscope. Further development leads to a corrugated surface. Electric current passes through bearing, and sparks are generated to fuse the raceway surface. Avoid flow of electric current by averting current with a slip ring or insulation bearing.
  • Inner ring of cylindrical roller bearing
  • Raceway surface is corrugated by electric pitting
    Photo 5
  • Rollers of tapered roller bearings
  • Electric pitting at middle of rolling contact surfaces

    Photo 6
  • Magnified (x400) pitting of roller shown in Photo 5
  • Nital etchant develops a white layer on the cross section
Explanation of magnified photo 6

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