Hardinge Quest 6/42 Spindle Contamination Fix


Possible cause of failure: Incoming test run to 3000 rpm: bearings were noisy and spindle had high balance. Front bearing triset and rear pair were contaminated with coolant, grease had been degraded. Inside of front cover & other interior surfaces of the spindle have coolant residue and some corrosion.


Recommended action: Clean, inspect overall dimensions. Drill & tap for an air purge fitting in front cover to help mitigate coolant contamination. Upgrade to sealed bearings, replace front cover gasket, rear lip seal & screws. Adjust preload, balance, assemble and break in. Final quality control inspection.


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