Unison Spindle Fails From Coolant Contamination



CHALLENGE

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.

SOLUTION

Recommended action: 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.

DETAILED CAUSE OF FAILURE

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