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Annoying fan sound  Rate Topic 
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 Posted: Tue Sep 15th, 2020 12:34 pm
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Hayden Colf
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My K-223 recently, is making this obnoxious sound. It sounds like grinding and buzzing (I can't even explain it)Here is a YouTube video on it making the sound. To my knowledge, medium makes it stop for a few minutes then it makes the annoying sound again. I checked and it wasn't the grilles or anything else.
Please help, this is now my sleep fan because my 3733 motor is messed up and cant use it anymore.
(Also this was posted on a random account not my main channel cause my viewers will not know the problem)

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 Posted: Thu Sep 17th, 2020 02:35 pm
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Levi Mevis
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Did you try oiling the motor? And yes this fan does have oil ports on both the front and back of the motor, the front oil port you have to go through the hole in the center of the fan blade hub the rear oil port is the little protrusion that's at the top of the rear of the motor (its the same thing in the front).

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 Posted: Fri Sep 18th, 2020 03:29 pm
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Hayden Colf
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It was oiled a month or two ago. I don’t that would cause the noise. Any other ideas why it would do that?

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 Posted: Tue Sep 22nd, 2020 12:15 pm
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Hayden Colf
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Update: The noise is definitely coming from the motor. After I woke up today before I turned it off, It was pretty loud so I put my ear near each part of the fan and the motor is making the sound no doubt. I hope this helps because this is my sleep fan so its very annoying at night. A few times I have to get up in the middle of the night half awake to turn it to medium, then back to low to make it stop. Then it makes the sound again like 5 minutes later. (This is all shown in the video)

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 Posted: Tue Sep 22nd, 2020 02:18 pm
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Rob Duffy
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You either don't have enough fiber washers on the rear side of the motor and the shaft is rubbing against the bearing housing or the bearings are shot and in that case you need a new motor.

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 Posted: Tue Sep 22nd, 2020 04:22 pm
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Hayden Colf
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If the bearings were shot, the fan would have a horrible spin down. The spin down time is like a minute long. If you watch the video maybe you can hear where is coming from I'm not sure where the sound is coming from.

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 Posted: Tue Sep 22nd, 2020 04:23 pm
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Hayden Colf
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Also, the sound only happens when the fan is on low. (or maybe the other speeds, not sure)

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 Posted: Tue Sep 22nd, 2020 04:56 pm
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Rob Duffy
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Not at all true. I have had a few fans that had bad bearings with great spin-down time. One of them was a box fan, the other fan was my Westinghouse Tesla which had a spin-down time of well over 2 minutes. It all depends on how the bearing wears and given that this typical box fan motor has two bearings, the wear could be on the rear bearing and coasting time is mostly based on the condition of the front bearing. I'm still going with my diagnosis being either bad/missing fiber washers or possible bearing failure. I've seen it plenty of times before.

Last edited on Tue Sep 22nd, 2020 04:57 pm by Rob Duffy

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 Posted: Tue Sep 22nd, 2020 06:00 pm
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Hayden Colf
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So let's assume it's the bearings. if the fan makes the sound on low, when I go to medium then low again, it stops for a few minutes. Next weekend when I have the oil with me i'll oil it and we'll see what happens. Until then, it's gonna be a little noisy.

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 Posted: Tue Sep 22nd, 2020 06:37 pm
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Rob Duffy
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Hayden Colf wrote: So let's assume it's the bearings. if the fan makes the sound on low, when I go to medium then low again, it stops for a few minutes. Next weekend when I have the oil with me i'll oil it and we'll see what happens. Until then, it's gonna be a little noisy.It stops because of oil circulation versus heating and cooling of the bearing surface and shaft surface. Metal expands and contracts as it heats up and cools off. Oil not only provides lubrication but also cooling to the surfaces, in this case we're talking about the porous bronze for the bearing and the hardened steel for the shaft. Minute differences but that's all it takes sometimes. If it's not the bearing then I would look at the shaft itself. Rare but I've seen it where the shaft is actually worn on one side and rattles as it heats up, but honestly I'd be surprised if this was the problem. I've only seen it once and it was on a Lakewood/Marco motor.

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 Posted: Tue Sep 22nd, 2020 07:31 pm
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Hayden Colf
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Yeah, I checked the shaft it's fine. Like I said next weekend I'll oil it and see what happens. You could be right on the heat thing. It gets VERY hot in the back sometimes. One morning when I was younger, I touched it the back of the motor and burned myself. It didn't hurt after, it just was very hot. (it was hot cause I ran it all night) To this day, I still wonder on how I was stupid enough to touch it after a full night shift.  :wondering: Also my profile picture is the very K-223 that were talking about lol

Last edited on Tue Sep 22nd, 2020 07:32 pm by Hayden Colf

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 Posted: Tue Sep 22nd, 2020 07:37 pm
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Rob Duffy
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Heat is a tell-tale sign of bearing failure. Usually when the bearing is worn, the surface is glazed over so no oil can get to the shaft causing friction, and thus, heat. I would open the motor and check for lateral play between the shaft and bearing. There should not be any noticeable play but if there is, then you know the bearing is worn out, even if just a little bit. That will cause noise and heat at varying temperatures and RPMs.

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 Posted: Tue Sep 22nd, 2020 07:44 pm
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Hayden Colf
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It makes me wonder, my P-223 3rd gen from 1988 is SO weird. It's got it's own personality. Some days, it rattles, some days it shakes, some days it'll start up quick or start up slow. And some days it's perfectly fine. That fan has become a meme in my collection by now. And whenever I use it, sometimes just for fun i'll say "stop rattling" and then I would like leave to get a drink and when I come back it stops. It knows me as well as I know it lol

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 Posted: Tue Sep 22nd, 2020 08:33 pm
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Hayden Colf
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Another thing about the heat, is all my fans, after I run them for either a video or something, they give off heat. I know this because I smell for oil after I run the fan sometimes just to be safe and every fan in my collection gave off heat. And my nose was like right above the motor so the heat could be felt with the fan on or off. Do you know why that is? (Here are the fans that gave off heat: 1976 S-223 1st gen, 1986 Sears 8121, 1980 K-223 2nd gen, 1988 P-223 3rd gen, 1980 Galaxy 6708, 2013 lasko 3733, 1980 robeson evenflow) They're all box fans and all of them give off heat after running.

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 Posted: Tue Sep 22nd, 2020 08:56 pm
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Rob Duffy
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That's just the nature of these fans. All of the fans you have listed I'm certain have shaded pole motors which are the most inefficient motor design. They use a lot of electricity when compared to other more efficient motor designs and most of that electricity is given off as heat. These motors just run hot. Excess heat of course is not good but that truly depends on just how hot they're running. The heat you're describing is typical for these mid 70's to early 90's box fans. It's just a cheaper design to cut costs with the PSC motors being reserved for the higher end models.

The smell of oil is typically associated with over-oiling where the oil drips onto the windings and burns off creating an oily smell.

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 Posted: Tue Sep 22nd, 2020 09:21 pm
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Hayden Colf
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Also, my galaxy had a rotor in bad condition. I assume at one point in it's life, it hit the stator. It doesn't do anymore since I took it apart to oil it but, if it happens in the future, what are you supposed to do? Thats one issue that I Don't know how to fix. (By the way my galaxy has that plastic sears motor in it)

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 Posted: Sat Sep 26th, 2020 03:30 pm
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Hayden Colf
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Ok I think I might of fixed the issue. My K-223 and Robeson even flow were oiled. The K-223 seemed to stop making that horrible sound. My Robeson on the other hand, seemed to sound a little like its dry even after oiling. I think a few of of my fans have done this before but I wonder why. Just makes a weird like hissing sound. 

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