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Emerson 74646-AL question  Rate Topic 
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 Posted: Sun Dec 26th, 2021 09:40 pm
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Kevin K Williamson
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I am restoring a 1952 Emerson Electric 74646-AL Hassock fan.  When I turn the switch the thing hums but is locked up solid.  When I attach the power cord directly to the motor it runs fine.  So the problem is either the switch or this part:  What exactly is this?  It’s got three wires coming off it, all cloth covered with a single thin copper wire inside.  Is this what’s hanging me up?

Last edited on Mon Dec 27th, 2021 05:34 am by Kevin K Williamson

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 Posted: Mon Dec 27th, 2021 12:29 pm
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Lane Shirey
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That’s your speed coil. Not likely to be causing your motor to lock up.  That’s generally caused by lack of oil, the wrong oil, or worn bearings. Does the blade spin freely and coast to a stop when spun by hand?

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 Posted: Mon Dec 27th, 2021 06:14 pm
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Kevin K Williamson
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Yes.  When the fan is turned off, the blade spins freely. When you turn it on, the blade is locked up.  Feels magnetically.

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 Posted: Wed Dec 29th, 2021 10:15 pm
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Lane Shirey
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If you’re holding the hassock on it’s side, that could be why.  Otherwise it’s likely a very worn bearing, allowing the rotor to pull toward one side of the stator. 

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 Posted: Thu Dec 30th, 2021 06:51 am
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Kevin K Williamson
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Nope.  Motor is perfectly vertical.  When I hook up the motor and turn it on the rotor latches onto one side of the magnetic coil and won’t let go.  Before I took the whole thing apart, when I attached the power cord directly to the motor it ran fine but when hooked up through the switch it would lock up.  After cleaning it and putting it all back together, it now locks up whenever under power from the switch or directly.  

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 Posted: Sat Jan 1st, 2022 01:26 am
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Stan Adams
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It sounds like what Lane said, bad bearing or the bearing fell out of its retainer while you were working on it. Could also be you have the stator cocked to one side so the rotor isn't centered.

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 Posted: Sat Jan 1st, 2022 01:44 am
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Kevin K Williamson
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But why does the blade spin feely when unpowered?

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 Posted: Sat Jan 1st, 2022 11:13 am
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Lane Shirey
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When powered it pulls the rotor toward one side of the stator opening instead of being centered, causing it to be magnetically attracted to the stator at that spot, thus locking it. 

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 Posted: Sat Jan 1st, 2022 08:27 pm
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Kevin K Williamson
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Hmm.  Unfortunately, the bearings and rotor are welded to one half of the exterior in this model.  Not sure how I’d fix this.

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 Posted: Sun Jan 2nd, 2022 04:08 pm
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Stan Adams
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Where do you live? There may be a collector in your area that can help you.

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 Posted: Wed Jan 5th, 2022 04:37 pm
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Levi Mevis
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A friend of mine from church gave me one of these fans (the one I had was a 1955 model year one) and that one I had some issues with but got them resolved.

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