I think that I understand the story a little better.
There is some play in the shaft so that it slides back and forward by about 3 mm or so.
If I pull it back, the motor starts fast, however. if I pull it forward the motor starts very poorly. This is, no doubt, due to the positioning of start winding switch.
I am not sure why there is so much play, I doubt that it is normal.
Bearings?
Sounds like you need to install a larger motor anyway.
often there are some shims or spring washers - a prior owner could have attempted repair and lost them
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I will see. This may be a 10 HP compressor that someone tried to use with a 5 HP motor.
I think that the front bearing is incorrect. I spent the morning removing the pulley, which is done by now, I will see what it is and will call Baldor.
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