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How do I get the oscillator knob off of a 77646-AS?  Rate Topic 
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 Posted: Sun Nov 8th, 2020 03:32 am
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Dennis Long
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Here's the oscillator gearbox bottom from my 77646-AS. I have loosened the set screw, as shown, but the knob still won't come off. How do I get the oscillator knob off?



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 Posted: Sun Nov 8th, 2020 04:46 am
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Levi Mevis
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I don't believe those come off, I think they are press fitted on.

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 Posted: Sun Nov 8th, 2020 06:31 pm
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Dennis Long
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Levi Mevis wrote: I don't believe those come off, I think they are press fitted on.
I could see that.  So, what does the set screw do?  That kind of threw me by making me think it would allow the gearshaft to release so I could do a better cleaning job.


Thanks.

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 Posted: Sun Nov 8th, 2020 07:41 pm
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Andrew Block
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They come off, it's probably glued on there by any grease that has worked its way between the shaft and the oscillator. Is it pot metal? Some of them have either expanded or contracted over the years on some of my fans, depending on the particular characteristics of the metal.

Start by spraying some penetrant down that screw hole. The shaft is flat on one side where the screw should be.

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 Posted: Sun Nov 8th, 2020 09:28 pm
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Steve Sherwood
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It's not pot metal, the oscillator knob has probably never been taken off.

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 Posted: Mon Nov 9th, 2020 12:50 am
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Levi Mevis
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I thought he was talking about the knurled knob on the bottom of the oscillator bell because that part isn't removable because its press fit on, but but the oscillator bell itself does come off yes, that's what the set-screw is for, but yes Steve is right probably the oscillator bell is stuck on the oscillator shaft because of old dried up gummy grease, and probably heat and a little penetrating oil will probably free it up so you can take it off.
The knurled knob on the bottom of the oscillator bell is for engaging and disengaging the oscillator mechanism and that is definitely not meant to come off, but the oscillator bell itself is meant to come off, just thought I'd clarify what I meant, and what I thought the OP was talking about.

Last edited on Mon Nov 9th, 2020 12:53 am by Levi Mevis

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 Posted: Mon Nov 9th, 2020 02:52 am
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Dennis Long
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Thanks guys for the input! I've used some PB Blaster down inside the bell, and now I have the bell filled with mineral spirits. If I still can't get it off tomorrow, I'll apply some heat. The saga continues....................

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 Posted: Tue Nov 10th, 2020 01:55 pm
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Steven P Dempsey
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They do come off, but get glued on after decades - - put he heat to it!!There are 2 set screws that hit flats on that shaft

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 Posted: Tue Nov 10th, 2020 01:58 pm
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Steven P Dempsey
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Xploded view - - see those flat spots? I recall this was a B to take apart



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 Posted: Thu Nov 12th, 2020 04:19 am
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Dennis Long
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Ok, I got the oscillator bell off!!  I took it out of the mineral spirits bath, dried it off, but still couldn't pull the bell off, not even with careful prying with a screwdriver.  I noticed the bottom of the bell had a center hole with a round piece of metal filling it (the gearshaft?).  I took a matching-sized brake caliper socket, positioned it on the round metal and tapped it lightly, but firmly with a rubber hammer (while holding the oscillator bell).  Once I noticed it moving, I kept at it until the big gear/gearshaft came out of the oscillator housing!!  Didn't get the chance to apply heat.  Anyway, thanks guys for the ideas and input.  Otherwise, I may have given up. Steven, below is my version of your exploded picture.  I wanted to show mine because both my bigger gear and smaller gear appear different from yours.  I understand Emerson made these fans for over 30 years, so the gears must have changed over the years.  I was curious about your fan's date code.  Mine is 33, so that means mine was made in '53, right?



Last edited on Thu Nov 12th, 2020 04:22 am by Dennis Long

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 Posted: Thu Nov 12th, 2020 05:34 pm
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Steven P Dempsey
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Yup - - 1953, (Date code + 20) they must have made millions of those gear cases over the decades.Don't lose those washers! Or get new ones if worn

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 Posted: Thu Nov 12th, 2020 05:37 pm
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Steven P Dempsey
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Back when I had more time -I documented all "dissections"



Attached Image (viewed 74 times):

Emerson 73648 AK disassembled.jpg

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 Posted: Fri Nov 13th, 2020 02:06 am
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Dennis Long
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It's smart to document the disassembly.  I don't trust my memory, so I pull out my phone camera every time I'm about to take something apart.  That has saved me multiple times.

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 Posted: Fri Nov 13th, 2020 11:41 am
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Steven P Dempsey
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Especially the placement of all those washers & spacers -

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