wrote in message
oups.com...

I disassembled the motor cleaned it and lubricated it with ATF. It
appears to be in very good condition. There is no end play in the
bushings and very little apparent wear. It starts better now and comes
right up to full speed, however the speed is 1720RPM either loaded or
running free. Same as before the cleaning. There seems to be four
poles which would suggest 1800RPM as you mentioned. Is it
theoretically possible for a four pole motor to operate at 1720RPM?

Yes

Varying the line voltage around 120V has very little effect on speed
so it appears that it is running synchronously.

No.

There is no capacitor
externally or internally. I just can't imagine what could have
possibly failed (if something did), to cause this. Lenny

You'd have to pull it apart to see, but it is possible that the rotor bars
have melted the solder. I doubt it though.

IME, it is the bearings. I would try to strip the oil with a solvent, check
for ANY play, and relubricate with Oilite lubricant.

Oilite: oil impregnated bronze bearings