GMN HV X120 30000-18 Spindle Rebuild



CHALLENGE

Customer indicated excessive chatter - bearings were noisy when spun by hand. #1 front bearing feels rough when rotated. Front bearing housing oversized & egged 0/+10µ (ISO is +/-7.5µ) Front shaft journal is oversized +9/+10µ (ISO is +/-4µ), but appears to be manufactured to that dimension. Rear housing is undersized -10/-11µ (ISO is +/-6.5µ), but appears to be manufactured to that dimension. Tach sensor function tested good. One set of thermistor wires was disconnected.

SOLUTION

Clean, inspect overall dimensions. Grind, plate & finish grind the front bearing housing. Replace ceramic bearings, o-rings and screws. Adjust preload, balance, assemble and break in. Final quality control inspection.

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