A little update on this. I believe that I have the "full picture".
- The motor shaft is completely straight (no surprise) The fit between the lower inner pulley hub and the motor shaft is not good and, therefore, the said hub does not want to sit straight.
This accounts only for a smaller part of vibration.
- The hydraulic stuff sits on a long 3/8" shaft, which is held in the lower outer pulley half by a bushing and retaining ring. Retaining ring sits in a circle in the sald pulley half. A part of the cast iron rim on this half is gone and the retaining ring was broken. The bushing had a lot of wear near the retaining ring and the whole thing vibrated a lot. I believe that eventually vibration would destroy everything.
I ordered the retaining ring. I asked Clausing how much it is to replace the shaft with bushing. If the shaft/bushing is affordable, I will just buy it, if not, I can make the replacement on the lathe/mill, it is not complicated.
i