Possible cause of failure:
Contaminated bearings in the front.
Shaft ID tool taper has 10 microns of runout and will need a kiss grind.
Pulley taper has 4 microns of runout and will need a kiss grind.
Clean, inspect overall dimensions.
Kiss grind shaft ID tool taper.
Kiss grind pulley taper.
Adjust preload, balance, assemble and break in. Final quality control inspection.
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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…