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AFCA Forums > Antique Fan Collectors Association > Pre-1950 (Antique) > Robbins & Myers M 81 newbie questions

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 Posted: Tue May 15th, 2018 12:13 am
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George Ramos
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Hello, this R&M seems to have about 1/8 slop fore and aft in the main shaft which seems to cause a vibrating sound every now and then.  Is there a way to tighten this?  Also, Ive removed the long screws/nuts that hold the motor housing together but it does not seem to want to come apart...is there a trick to that or perhaps something else needs to be unscrewed first?
Thanks all


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 Posted: Tue May 15th, 2018 12:18 am
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Steve Stephens
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A photo should show us what an R&M M 81 is.   I've don't recall knowing about the fan.

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 Posted: Tue May 15th, 2018 12:54 am
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George Ramos
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Here is a pic.  

Attached Image (viewed 133 times):

20180514_172116_Film3.jpg

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 Posted: Tue May 15th, 2018 01:58 am
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William Lashley
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I think that's a 1604? Post a clear picture of the data plate, where the switch is.

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 Posted: Tue May 15th, 2018 03:23 am
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George Ramos
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Yes it is a 1604.  Says "list no 1604" on the tag.sorry the "m81" is part of the serial number...

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 Posted: Tue May 15th, 2018 05:05 am
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Mike Eckenroad
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Fiber washers on the shaft is how you deal with end play on the rotor but 1/8" sounds reasonable to me. I wouldn't want much more than that though. I have never worked on one of those fans so maybe someone else can chime in but if it is a stamped steel housing you usually start by wiggling a razor blade in the seam and then a putty knife and then something a bit larger and so on, working it evenly around. 

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 Posted: Tue May 15th, 2018 10:33 am
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Lane Shirey
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Buy a knife called a cable splicing knife on Amazon for around $20. It's a heavy duty knife that will replace the razor blade and putty knife described above. Just line it up with the seam and give it a whack with a hammer on the back of the blade. It's the best $20 you can spend. 



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