>>2966103
OP here.

Actually, the grounding might be fine. It's mounted to grounded conduit, and only the ground wire isn't screwed down under the cap.

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are you at all technically inclined? if so you can test the run capacitor with a multimeter that also tests capacitance (should be a black box with 2 to 5 wires coming out of it) 90% of the time the diagram of what values each capacitor should be

>>2966105
>are you at all technically inclined?
Yes, but I don't have a multimeter that can test capacitance. I'll have to get one, I guess.

Depending on the noise, it could be a failed bearing.

>>2966103
are the blades sagging from gravity pulling on them ?

sometimes the screws are loose and it makes that kind of noise

>>2966279
A little bit.

>>2966303
I had a fan that the blades sagged and they were uneven so it was making it wobble from being out of balance bend them back up so they are even and see if it gets any quieter

>>2966380
I will when I figure out how to bend the wood back up without making it worse.

>>2966390
I just held the center of the fan and pushed up on the outer edge of the blades they bend way easier then they look

First thing I would do is dissassemble it and clean out everything inside. I've seen old ceiling fans with the motor area choked up with accumulated dust and it makes them not operate so well.

>>2966403
It's wood, they're not gonna conform like metal.

My plan was taking the blades off and ironing one side, so hopefully the wood would contract more on the top and pull the blades back up.

>>2966404
That is a good point, it is dirty on top from being in a greasy kitchen for decades. We didn't even buy it new, it was trash picked for free about 25 years ago.

>>2966404
>>2966469
*so who knows what else it was subject to, and I wasn't living here all those 25 years, so I don't remember if it always acted like this when we had it.

>>2966103
record the sound and upload it to vocaroo then post the link here so we can hear it

>>2966467
Mine had wood blades also it was the metal brackets that mount the blades to the motor the were sagging

>>2966103
Ima say bad capacitor.

>>2966103
Put a Tesla motor in it

>>2966103
Absent further information, I'm thinking it's probably a failed bearing. Try turning it off and spinning it fast by hand. If you still hear the noise, it's a physical problem. If not, may be something electrical.

Could also be that the motor has to work too hard to spin it at high speed due to bad bearings or general filth.

I can state from personal experience that old fans do benefit from periodic maintenance, which entails partial disassembly and cleaning. Doesn't take too long, look up a video on YT.

>>2966103
>old ceiling fan crackles
>oh fuck wtf now, open to fix, everything looks alright
>it literally sounds like sparks going off
>I remember I use to unscrew the light bulbs because the switch died like a decade ago
>unscrewing bulbs until they turned off left a tiny gap just enough for them to spark
kek

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>>2966106
for that price you can just buy a new fan

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>>2966103
Just like said >>2966404
The issue maybe could be the bearing where the rotor spin at.

A few weeks i go i found this stand fan(pic related) outside a store so i took it to home. When i did plug it to the electric outlet the fan didn't spin and i did hear a bzzzzzz sound, so i applied oil to the shaft of the rotor and the fan came back to live and the buzzing stop!

So yeah the issue it was the bearing(the fan was covered in dust). I still without fix it 100% at all because i can't remove a screw of the motor in order to get access to the bearing to apply grease because the oil don't last a lot due the spinning of the motor the oil is tossed outside due the centrifugal force of the spinning, so 'electric motor bearing grease' is need it to fix this, oil is just temporal solution.

Sorry if you had a stroke trying to read my pist, im ESL.

I hope i have helped

>>2973515
Also seems like 'graphite grease' is the best for this.

>>2966103
AC motors have a slip rating. Which literally means the rotor and stator aren't synced perfectly with the 60z AC. Rpms should be multiples of 60, but since they slip rpm ratings are slightly less than theoretical. IE an AC condenser fan motor would a theoretical rpm of 1200 and actual rpm of 1075.

The electrical noise is magnetic and electrical fields interfering with each other because of the slipping. It's probably worse at the highest speed because something is causing excess friction or load. IE dust and dirt buildup on the bearings, dry bearings, or even the fan blades warping.

Try holding the fanblades still and turn the fan on, it should make an electrical buzzing noise. Compare that noise to what you've been hearing to see if it's actually the motor. And try greasing it like the other anon.

>>2966103
Is that a Hunter? That would make it an expensive brand.

At that age, I would immediately assume friction. It must have decades of dust caked inside it.
If you want it to run forever, you could take it apart, clean it, and potentially replace brushes if needed.
If you just want it to keep moving but shut up, a bit of sewing machine oil might be cheap and effective without taking it apart or down.