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1956 Sears Homart Cooler Window Fan Motor Issues  Rate Topic 
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 Posted: Tue May 19th, 2020 05:35 am
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Levi Mevis
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Hello Everyone, I'm in need of some help to repair a sticking centrifugal switch on a 1956 Sears Homart Cooler Window Fan Motor. 

The  motor is the original Craftsman motor to the fan and when the fan is turned on in exast mode the centrifugal switch works like it should, but when I turn it on in intake mode the centrifugal switch turns off but not completely when the motor gets up to speed resulting in an annoying low volume buzzing noise that is continuous (which I can't imagine that running a motor with a centrifugal start switch that hasn't completely disengaged would be all that good for it.) 

I already took the motor apart and tried cleaning the switch's contacts and checked the spring and everything and put it back together and the switch worked fine for a little bit but then it went back to sticking again.

How much for and aft play should there be in this motor and can a motor having too much for and aft slop affect how a centrifugal switch works?

This is my first time dealing with a fan that has a centrifugal start switch, so I'm not familiar with how they should or shouldn't work so any help with that would definitely be a great help for in the future if I come across another fan with a centrifugal switch in it.

Any help in this matter would be appreciated.

Thanks,

Levi

Last edited on Tue May 19th, 2020 05:42 am by Levi Mevis

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 Posted: Tue May 19th, 2020 01:54 pm
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Tom Zapf
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check with mike heffernan by pm ...or bill fanum i think 

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 Posted: Tue May 19th, 2020 03:49 pm
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Levi Mevis
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Tom Zapf wrote: check with mike heffernan by pm ...or bill fanum i think 
Ok, I'll check with them. 

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 Posted: Tue May 19th, 2020 07:05 pm
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Stan Adams
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I don't think your problem is a stuck starter switch. That switch would not have to be stuck on for very long before the magic smoke would come out.

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 Posted: Tue May 19th, 2020 07:16 pm
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Levi Mevis
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Stan Adams wrote: I don't think your problem is a stuck starter switch. That switch would not have to be stuck on for very long before the magic smoke would come out.

Ok, so then what would the problem be then? 

Because like I said in my original message when running the fan in reverse (exaust mode) the fan buzzes for a couple of seconds and then goes away completely, once the motor is up to speed (the centrifugal switch disengages) but when running it in forward mode the motor buzzes for 2 seconds and then stops once it's up to speed but then it continues to do a slight buzzing noise even after the motor has gotten up to speed and disengaged the centrifugal switch.


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 Posted: Tue May 19th, 2020 07:26 pm
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Stan Adams
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I would closely check for loose windings, if you find some loose, they will normally silence if you spray them with motor insulating varnish. Try running it with the belt off, you should hear the starter go out when it reaches full speed. You may also try a kill-a-watt meter & check the wattage. It will be a little different between supply & exhaust due to the blade efficiency, but shouldn't be a big difference.

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 Posted: Tue May 19th, 2020 09:46 pm
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Levi Mevis
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Stan Adams wrote: I would closely check for loose windings, if you find some loose, they will normally silence if you spray them with motor insulating varnish. Try running it with the belt off, you should hear the starter go out when it reaches full speed. You may also try a kill-a-watt meter & check the wattage. It will be a little different between supply & exhaust due to the blade efficiency, but shouldn't be a big difference.

I think I figured out what it is, the rubber vibration dampening end caps are pretty hard (the rubber has hardened over the years kind of like what happens with old record player idler tires or old rubber cords on fans) and so they don't have the same vibration dampening factor as they did when they were soft like they were when the fan was brand new 60+ years ago. The reason why I think its the rubber vibration dampening end caps is because when the fan is unmounted (taken out of the mounting bracket) and just set on the table and turned on the motor doesn't make any noise its absolutely silent (well about as silent as an electric motor can be anyways).

I think what I could do is see if I could use rubber renew on the end caps and see if I can soften the rubber back up again and see if I can get the buzzing noise to go away. 

Also I think I'm going to repaint the fan in either a robin egg blue or an aqua green both of which are period correct colors and are colors I've seen these fans painted in from the factory when I've done a Google Image Search of Homart Cooler Fans, I think the original cream color just isn't interesting enough for me and is too common of a color.

Last edited on Tue May 19th, 2020 10:08 pm by Levi Mevis

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 Posted: Thu May 21st, 2020 01:39 pm
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Tom Zapf
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I HAVE NEVER SEEN THAT FAN IN ANY BLUE GREEN COLORS, JUST THE ORIGINAL BEIGE, THE GRAY AND TWO TONE BROWN/TAN... IN THE ATE 50S THE HOMART BOX FANS COULD BE FOUND IN ROBINS EGG BLUE, BUT I HAVE NEVER SEEN A BELT DRIVER IN THAT COLOR

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 Posted: Thu May 21st, 2020 04:00 pm
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Levi Mevis
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Tom Zapf wrote: I HAVE NEVER SEEN THAT FAN IN ANY BLUE GREEN COLORS, JUST THE ORIGINAL BEIGE, THE GRAY AND TWO TONE BROWN/TAN... IN THE ATE 50S THE HOMART BOX FANS COULD BE FOUND IN ROBINS EGG BLUE, BUT I HAVE NEVER SEEN A BELT DRIVER IN THAT COLORWell I have, do a GIS (Google Image Search) for Sears Homart Cooler Window Fan and you'll indeed find one in a blue color (it wasn't a repaint).
See link below to see the blue Homart Fan in question.

Blue Sears Homart Cooler Fan

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 Posted: Fri May 22nd, 2020 01:38 am
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Andrew Block
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Levi Mevis wrote: Tom Zapf wrote: I HAVE NEVER SEEN THAT FAN IN ANY BLUE GREEN COLORS, JUST THE ORIGINAL BEIGE, THE GRAY AND TWO TONE BROWN/TAN... IN THE ATE 50S THE HOMART BOX FANS COULD BE FOUND IN ROBINS EGG BLUE, BUT I HAVE NEVER SEEN A BELT DRIVER IN THAT COLORWell I have, do a GIS (Google Image Search) for Sears Homart Cooler Window Fan and you'll indeed find one in a blue color (it wasn't a repaint).
See link below to see the blue Homart Fan in question.

Blue Sears Homart Cooler Fan

That one is not original. They always color matched the tags on the timers. And you can see the scratches in the paint.

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 Posted: Fri May 22nd, 2020 07:46 am
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Levi Mevis
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Andrew Block wrote: Levi Mevis wrote: Tom Zapf wrote: I HAVE NEVER SEEN THAT FAN IN ANY BLUE GREEN COLORS, JUST THE ORIGINAL BEIGE, THE GRAY AND TWO TONE BROWN/TAN... IN THE ATE 50S THE HOMART BOX FANS COULD BE FOUND IN ROBINS EGG BLUE, BUT I HAVE NEVER SEEN A BELT DRIVER IN THAT COLORWell I have, do a GIS (Google Image Search) for Sears Homart Cooler Window Fan and you'll indeed find one in a blue color (it wasn't a repaint).
See link below to see the blue Homart Fan in question.

Blue Sears Homart Cooler Fan

That one is not original. They always color matched the tags on the timers. And you can see the scratches in the paint.
My fan has it's original paint and it has scratches and rust all over it as well doesn't mean it's not original. Plus I'm going for a period correct color not an original color for the fan...

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