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 Posted: Tue Jul 24th, 2018 09:14 pm
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Steve Shelton
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I have a Casablanca Delta Model 10777 , manufactured April 1983, with an Emerson K55AMBHT-9210 motor. It makes an irregular tapping or knocking sound at all speeds. It makes the sound when I rotate the blades by hand. The flywheel is tight and hasn't fallen down. 

I removed the fan and opened the housing. When I run it on the bench it is silent for a while but eventually makes the sound, only much quieter - I assume because the fan blades are removed. The strangest thing is that when I loosen a nut on the top motor end cap bolt even slightly, just 1/4 turn, the sound stops. Then I can tighten it again and it will be quiet for a while, but eventually start knocking again. I guess I could just leave the nut loose but that's not fixing the cause of the problem.

I'm not sure where to go next. I really like this fan - it's been in the family for 35 years - but the tapping noise is intolerable.










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 Posted: Wed Jul 25th, 2018 11:12 am
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James Pinette
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 it sounds like it could be the bearings maybe?

Last edited on Fri Jul 27th, 2018 05:22 pm by James Pinette

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 Posted: Fri Jul 27th, 2018 01:23 am
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Brian Hicks
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Only thing I can think of would be the bearings. You are really close there... just take the four bolts out and separate it.

I am figuring that a ball stuck for whatever reason at a point in time and then started rolling again intermittently.

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 Posted: Mon Jul 30th, 2018 09:04 pm
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Steve Shelton
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I went ahead and took everything apart. The top bearing stayed in the housing. I didn't see any way to get it out.




I managed to remove the bottom bearing, but really boogered up the dust cover in the process. I couldn't feel or hear anything wrong with the bearing when I turned it. The grease looked it's age but there was plenty in there. I didn't change the grease because I might have done more harm than good since I don't know what kind of grease to use. I just tapped the dust cover back into shape as best I could and put the bearing back.

I reassembled the fan and reinstalled it. No sound. Maybe there was something in the motor housing that fell out without me knowing it. Maybe tomorrow it will start tapping again. Hopefully, it will run silent for another 35 years.

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 Posted: Mon Jul 30th, 2018 09:55 pm
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Levi Mevis
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Usually to regrease those bearings just plain old wheel bearing grease or Lucas Red n' Tacky is all you need to use to regrease those things, they aren't any different from the oscillator gearboxes on your old table fans. They appear to be ball bearings which you should be able to get replacements for easily at an online parts store that specializes in Ball Bearings.

Last edited on Mon Jul 30th, 2018 09:58 pm by Levi Mevis

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