The condition of approximately 600 suspect rolling bearings from electrical machinery was examined. This number did not represent a high failure rate in relation to the number in use at the time, but afforded a basis for the assessment of the frequency of the various types of failure. The grease in use was the R.N. multipurpose grease XG-274 which consists of mineral oil and a gelling agent (currently a metallic soap) and oxidation and corrosion inhibitors, but some bearings still contained earlier greases. The most frequent causes of failure were corrosion, various machine and fitting defects, and dirt. The defects detected are discussed.
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