C A S E S T U DY The Problem The main bearing in the bucket conveyor of a Polish lake dredge needed replacing at intervals much shorter than the planned lifetime. An SD 23144k fixed double-row spherical unit, it was clearly unable to withstand the abrasive effects of the wet sand and gravel being extracted. What’s more, its trapped position and one-piece structure made it very difficult to access for maintenance or replacement, while the use o

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