On Thu, 06 Aug 2009 04:05:08 GMT, "Ivan Vegvary"
wrote:

Okay, I finally took the electric motor (3/4 hp, capacitor start) off the
cement mixer. This is the motor that got flooded under water for about a
day or two (about 4 months ago).

Shaft will not turn. What's my next step? Tap on it with a soft mallet?
Try to take the end caps off? Move the shaft axially?

If you've done this, please advise. If you think it's a lost cause, tell
me.

I'd say Tentative Lost Cause - because replacement motors are FAR
cheaper than the time and effort it would take to save that one. Just
getting two new bearings and a "Dip and Bake" done on the windings
will push the price past a new motor.

(If that was a 10-HP plus, or a specialty motor that the machine was
constructed around that isn't available at commodity prices like some
Bridgeports, then it starts getting cheaper to fix the old one than
buy a replacement.)

Open it up, clean it out. Check and/or clean and lube the bearings.

Ohm out and visually inspect the windings, a Megger insulation test
if you have the tool. No sense doing any work if it's just going to
let out the Magic Smoke in thirty seconds.

And if it won't go, it's out - call around for a replacement. You
need to write everything down from the label or just take the dead
motor in with you. Frame size, HPO, RPM, Rotation (some are
reversible easily, some are not...) Servicer Factor...

Oh - Don't forget to clean out the bearings and gearbox on the cement
mixer, and lube everything - if the motor got wet, they did too.

-- Bruce --