This spindle had catastrophic rear bearing failure. The picture below shows the rear bearings (to the right) got extremely hot. The rear housing was egg shaped which may have caused the ball cage (white at the top of the picture) to not move freely. As the spindle heats up the shaft grows and if the ball cage does not allow thermal expansion the rear bearings become excessively preloaded and fail.
Possible cause of failure:
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Catastrophic bearing failure was the main cause of this spindle malfunction
Continue reading to learn how Northland Tool performed this repair and converted a Weiss GHK 176239 spindle from grease-injected to permanent grease lubrication…