Okuma HK307 Spindle Repair

Okuma HK307 Spindle Repair


Spindle shaft had endplay incoming and both the front and rear bearings felt rough.  The front shaft nut spanner holes were damaged. The shaft tooling pilot was worn and tapered +5/+22µ with 8µ runout.



The following actions were performed on this Okuma HK307 spindle:

  • Clean, inspect overall dimensions
  • Repair front shaft nut spanner holes
  • Grind, chrome plate, and finish grind shaft tooling pilot
  • Replace bearings, o-rings, air fittings, and screws



After reassembly of all components, adjusting bearing preload, and undergoing break-in and testing procedures, this spindle passed our final quality inspection before being returned to our customer with a 1-year warranty.

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