Unison Spindle Fails From Coolant Contamination
Possible cause of failure:
Bearings failed from contamination and loss of grease.
Coolant jacket holds pressure and is not blocked up. Field tested good.
Machine-side electrical connector was broken off incoming & had spliced wires.
Front OD taper has 10-12µ runout.
Rear housing oversized +15/+18µ (ISO is 0/+11µ), front housing undersized -12/-20µ (ISO is +/-6.5µ), use as is.
Clean, inspect overall dimensions.
Kiss grind front OD taper.
Replace bearings, wave spring, electrical connector & screws.
Adjust preload, balance, assemble and break in. Final quality control inspection.