Coolant contamination had worked its way through the front and rear labyrinths over time. The coolant mixes with the grease of the bearings and slowly compromises the lubrication. The thin film of lubricant between the balls and the raceways is compromised and the balls make contact with the races. This causes damage that continues to deteriorate the bearings until failure.
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…