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Emerson Electric 77648-AS Motor Question  Rate Topic 
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 Posted: Thu Jun 27th, 2019 08:42 am
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Kevin K Williamson
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I'm revamping a '53 Emerson Electric 77648 and when I wired it up, the motor catches but if you spin it, it gets going.  Problem is, if you spin it the opposite way, it also gets going and spins the blade off which has already screwed up my paint job.  Why is this happening?  I thought a motor only went one way.  I'm filming this but I can't believe that the first fan I did, a 77646 went so much easier.

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 Posted: Thu Jun 27th, 2019 01:09 pm
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Stan Adams
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Kevin, what you are describing is a bad capacitor or the wire going from the capacitor to the motor is open. Most likely replacing the capacitor will solve your issues.

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 Posted: Thu Jun 27th, 2019 04:53 pm
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Kevin K Williamson
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Any idea where to get an Emerson 77648 capacitor?

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 Posted: Thu Jun 27th, 2019 05:08 pm
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John McComas
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http://www.ebay.com/itm/CBB61-500V-2-5UF-Terminal-Ceiling-Fan-Motor-Running-Rectangle-Capacitor-2-wires/272759511039?epid=23011090036&hash=item3f81bbd7ff:g:pd4AAOSwtBdaV3~c


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 Posted: Tue Jul 16th, 2019 06:10 pm
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Kevin K Williamson
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So after all that, I bought two of the above capacitors, wired in one, then two in sequence and nothing has changed.  The shaft doesn't turn unless given a nudge and if you nudge it counter clockwise it goes that way and vice versa.  Very discouraging.  What else could be wrong?

Last edited on Tue Jul 16th, 2019 09:32 pm by Kevin K Williamson

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 Posted: Wed Jul 17th, 2019 12:49 pm
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John McComas
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Sounds like an open circuit on your auxiliary winding.
Very likely could be an open headwire.  (Three conductor wire going from the base into the motor.
With power off, measure the resistance across the capacitor. ( B to C) It should be around 176 ohms. 
If not, you have an open circuit and need to fix.  (maybe replace the headwire, they flex and break inside the sheath)
Happy Emerson Fanning!

http://www.fancollectors.org/info/mccomas/Emer_77648sm.jpg


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 Posted: Mon Jul 22nd, 2019 05:50 pm
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Kevin K Williamson
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Nope.  I have a 77646 which runs perfectly and when I attach the three wires from my 77648 to the 77646, the 646 does runs perfectly.  When I attach the 77646 wires to the 77648 motor, still the same problem.  Spins both ways, doesn't spin unless you nudge it.  Do I have a broken motor in my 648?  I must.  The wired electro magnet part from the 646 works in both fans and the one from the 648 doesn't.  The 648 one looks to have all it's wires connected so I don't know what's going on with this...

Last edited on Mon Jul 22nd, 2019 11:42 pm by Kevin K Williamson

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