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Emerson 79648-AP-G Bearing Removal  Rate Topic 
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 Posted: Tue Feb 27th, 2018 01:19 am
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Robb Bailey
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Hello all

I have purchased my 3rd "older" fan, and am diving into it for a refresh.  It is an Emerson 79648-AP-G and am planning on using this daily as an air-mover in my kitchen.

I picked it up cheap on CL.  I think the repainting of it by the PO just might be why no one else was interested.  Best part was the blades were painted while installed, so the whole thing was covered in green over-spray.




The fan runs just fine with the oscillating mech disconnected.  The speed switch was sketchy but speeds did work.  I hooked up the oscillator arm, and the fan won't run; obviously grease issue in the oscillator gearing.

I now have the whole thing torn apart save the bearings.  I didn't notice any play so I don't thing the bearings are bad, but I want to put the casings in the parts blaster and don't want the bearings in there while that is going on.  So, the question is, how do these come out?  I don't want to go hammering or pressing in a way that isn't going to work due to the materials involved.  Any help would be appreciated.  Thanks




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 Posted: Tue Feb 27th, 2018 01:25 am
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Levi Mevis
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your fan is what is referred to as a Government Issue Fan (which is why it is suffixed AP-G the G Refers to Government issue or use) anyways I believe that Series of Emersons (The 77 series) is a single Bearing fan so you only have one bearing to remove, and its in the rear housing. 

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 Posted: Tue Feb 27th, 2018 01:29 am
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Robb Bailey
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As it is a "G" gov't model, it is a two bearing fan.  The residential models were single bearing.

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 Posted: Tue Feb 27th, 2018 01:32 am
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Levi Mevis
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Yeah, I guess I didn't think about that. I kind of forgot that the Government models were beefed up more than the residential models.

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 Posted: Thu Mar 1st, 2018 02:31 am
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Terry Plata
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Hello Levi,
On removing those bearings: It's hard to tell from the photo but it looks like the front bearing just needs to be pressed through with a bearing driver of the appropriate size. If the rear bearing is in a blind hole, that creates an additional challenge. If there is a removable plug in back of the bearing, problem solved!  If not, screwing a tap into the bearing will remove it but also destroy it. A non destructive method would be to pack grease into the bearing bore and use a good fitting shaft and mallet to hydraulically force the bearing up and out. Be sure the opposite side of the housing is well supported near the bearing bore so you don't crack the housing. Foul language will follow.

The safest way would be not to mess with it! protect the bearings during the cleaning process and do not remove and take a chance of messing up a good bearing or breaking a brittle housing.... Let us know which route you choose. Good Luck!    Terry

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 Posted: Thu Mar 1st, 2018 02:45 am
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Levi Mevis
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Hello Terry, I believe Robb is the one who is having the issues with the bearing removal not me, I was just trying to help him out.

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 Posted: Thu Mar 1st, 2018 02:55 am
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Terry Plata
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Ah, you are correct, a thousand apologizes! Hope Robb sees the post and is sympathetic to us senior citizens.

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 Posted: Thu Mar 1st, 2018 02:58 am
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Levi Mevis
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It's ok, although I'm not a senior citizen I'm only 29 years old.

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 Posted: Thu Mar 1st, 2018 09:42 am
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Lane Shirey
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Get a high quality duct tape and close off all orifices so the media can't get in. When blasting, direct the stream away from the tape edge and nothing, or very little will get in. It helps to degrease the area so the tape sticks securely. You can also ball up paper and jam it into the holes under the tape as a secondary protection. 

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 Posted: Thu Mar 1st, 2018 11:19 am
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Robb Bailey
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Thanks Terry and Lane.  I was leaning towards the leave in and protect them method, and you guys have confirmed that is probably the best approach.  Thanks again.

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 Posted: Thu Mar 1st, 2018 12:35 pm
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David Allen
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Robb Bailey wrote: Thanks Terry and Lane.  I was leaning towards the leave in and protect them method, and you guys have confirmed that is probably the best approach.  Thanks again.


Hi Robb.  In my opinion; there is a very small chance of lightly damaging a bearing by blasting.  However, there is a relatively large chance of completely destroying the bearings truing to remove and reinstall them.

As everyone said, try not to blast the actual running surfaces. I've blasted many parts without removing the bearings.   It seems that automotive rubber vacuum hose caps can be pressed into the bearing shaft bore, thereby preventing any blast media from hitting the bearing.  Then, force the next larger size vacuum hose cap OVER the first one, to cover the thrust face of the bearing. You can get these at any DIY parts store in an assortment package of different sizes.

If I were at home today I would demonstrate.

It is important to degrease and dry everything well, so that the dust doesn't stick to anything that is oily.  It's hard to get all the dust and leftover media out of hidden areas if there is oil in there.

Sincerely,
David

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 Posted: Thu Mar 1st, 2018 07:46 pm
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Duane Burright
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Robb,

Those Government Emerson fans are among their best. I've got a 16" I run in the workshop.

David Allen wrote: Hi Robb.  In my opinion; there is a very small chance of lightly damaging a bearing by blasting.  However, there is a relatively large chance of completely destroying the bearings truing to remove and reinstall them.

As everyone said, try not to blast the actual running surfaces. I've blasted many parts without removing the bearings.   It seems that automotive rubber vacuum hose caps can be pressed into the bearing shaft bore, thereby preventing any blast media from hitting the bearing.  Then, force the next larger size vacuum hose cap OVER the first one, to cover the thrust face of the bearing. You can get these at any DIY parts store in an assortment package of different sizes.

If I were at home today I would demonstrate.

It is important to degrease and dry everything well, so that the dust doesn't stick to anything that is oily.  It's hard to get all the dust and leftover media out of hidden areas if there is oil in there.

Sincerely,
David

That's actually a great tip that never occurred to me. I have used those silicone plugs myself.

Duane

Last edited on Thu Mar 1st, 2018 07:50 pm by Duane Burright

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 Posted: Thu Mar 1st, 2018 08:39 pm
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Dan Foley
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Duane Burright wrote: Robb,

Those Government Emerson fans are among their best. I've got a 16" I run in the workshop.


They really are amazing.  Out of my entire collection I'd say my 16" AP-G has seen the most use.  Whether it's winter or summer I run it almost every night, I love that very faint white noise the blades produce on low speed.

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