Johnford DMC 3100SH Spindle Repair

Our customer called in with this spindle failure and they wanted help extending the life of their spindles. After visiting their facility to evaluate their process and machine we determined that the rear bearings were failing. The rotary union was leaking into the rear of the spindle and contaminating the rear bearing. We replaced the rear bearing set with sealed bearings, they replaced the rotary union and the modified spindles are in place.

Possible cause of failure:
Rear bearing was contaminated from a leaking rotary union
Taper needs a kiss grind.
No drawbar or drive dogs supplied.

Recommended action:
Clean, inspect overall dimensions.
Replace bearings.
Kiss grind taper.
Adjust preload, balance, assemble and break in. Final quality control inspection.

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