C A S E S T U DY The Problem The original sleeve (hydrodynamic) bearings in the radial fans in a deep coal mine were leaking oil and, partly owing to the abrasive environment, failing to achieve their specified lifetimes. The manufacturer of the fans asked Cooper Bearings to propose an alternative package which would offer longer bearing lifetimes and remove the many maintenance problems associated with a complicated oil lubrication system. Th

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