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Manning Bowman trouble  Rate Topic 
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 Posted: Fri May 17th, 2019 11:51 pm
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Kim Watts
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I purchased a model 41 Manning Bowman fan and need some help diagnosing what is wrong with the gearbox.  The fan was damaged in shipping and I would like to save it. 

When I received the fan it would start to oscillate but stopped / got stuck.  It also started to over heat (probably because it was stuck).  When the fan was off it did rotate when manually moving the parts in the back. The speed of the fan also seemed a little slow.   See the video
https://www.dropbox.com/s/co31pvksy76eoqf/VID_20190308_162408.mp4?dl=0

We removed the gearbox and cleaned some of the old oil and crud out and added some oil. The fan speed improved but it didn't rotate anymore.  Also the fan wouldn't rotate manually any more.  We completely cleaned out the gearbox.  The top gear won't move.  The fan runs but won't oscillate.   We can't figure out how to remove the gears to see if there is debris keeping the gear from moving.

Any help / suggesting would be appreciated! 

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Untitled attachment 00093.jpg

Last edited on Fri May 17th, 2019 11:55 pm by Kim Watts

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 Posted: Fri May 17th, 2019 11:53 pm
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Kim Watts
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the back of the fan

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Untitled attachment 00105.jpg

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 Posted: Fri May 17th, 2019 11:54 pm
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Kim Watts
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different angle

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Untitled attachment 00102.jpg

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 Posted: Sat May 18th, 2019 09:30 am
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David Allen
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Looking at the gearbox picture, it seems that the locating dowel on the right of the picture has been crushed. That would make me think that the gearbox might have been shifted or knocked out of alignment during the shipping damage. You can probably file down the damaged area on the alignment dowel, so that the box can be reinstalled without binding.

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 Posted: Sat May 18th, 2019 10:57 pm
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Kim Watts
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Thanks for responding.  I'm new to this.  Are you referring to the black piece right above the off white gear?  I'm trying to figure out which piece is the locating dowel and what part is crushed.  I'm thinking the locating dowel the whole top assembly and part of it is crushed.  I tried searching the internet to determine which part you were talking about but didn't have much luck. 

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 Posted: Sat May 18th, 2019 11:15 pm
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David Allen
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Sorry about the confusion. The locating dowel is the round "bump" sticking up from the casting, just above the screw hole. There are two of them One on each side. The one on the right looks like it has a bit of metal "mashed down" on the right side of it.

I'm thinking that could be holding the box at an angle and binding the gears.

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 Posted: Sun May 26th, 2019 09:11 pm
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Kim Watts
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Thanks for the idea.  Unfortunately one of the gears is still stuck. The gear with the red arrow spins freely. The gear with the yellow arrow won't spin at all. (manually)  I believe it could spin before the old oil and crud was removed.  We used a q-tip to help remove the chunks. The head of the fan could be manually rotated before and now it can't.  If I can free this gear the fan may work again.  I just don't know how to remove the gear from the gearbox. I read "Wizard, Zero, Eskimo, Manning Bowman Refresh for beginners" but it doesn't slow how to remove the gears.  Is there another article that explains how or an article on how to convert it to a stationary fan?  Thanks in advance!

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arrows gearbox a.jpg

Last edited on Sun May 26th, 2019 09:14 pm by Kim Watts

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 Posted: Tue May 28th, 2019 02:11 pm
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Gunner Lake
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Kim Watts wrote: Thanks for the idea.  Unfortunately one of the gears is still stuck. The gear with the red arrow spins freely. The gear with the yellow arrow won't spin at all. (manually)  I believe it could spin before the old oil and crud was removed.  We used a q-tip to help remove the chunks. The head of the fan could be manually rotated before and now it can't.  If I can free this gear the fan may work again.  I just don't know how to remove the gear from the gearbox. I read "Wizard, Zero, Eskimo, Manning Bowman Refresh for beginners" but it doesn't slow how to remove the gears.  Is there another article that explains how or an article on how to convert it to a stationary fan?  Thanks in advance!

Hi Kim. The red gear should spin freely by hand, and should slowly turn the yellow one. You will not be able to rotate the yellow gear by hand however as it interfaces with a worm gear underneath. If spinning the red one (a lot) does not turn the yellow one (and oscillator arm) then I think that the shaft down to the arm might be frozen. I'll add that these fans have notoriously unreliable oscillator mechanisms. If all else fails you could break off / file down either the red gear or yellow gear to allow function as a stationary fan.

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 Posted: Tue May 28th, 2019 06:04 pm
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Kim Watts
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Thanks a lot.  At least I can make the fan usable again.  It's in good shape otherwise so it would be a shame if I couldn't.

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