ndtiger
Vicksburg, MS
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Joined: 12/29/2004
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I turned on my air yesterday for the first time since our last trip, about a month ago, and had severe vibration. I took off the cover and checked the fan to see if it wasd loose and it was not. I pushed down, ever so slightly, on the A/C tray or housing, whichever you choose to call it, and the vibration stopped. I then went inside and took the face plate off the controller and saw where you could tighten the roof unit. Tightened the bolts and eliminated most of the vibration.
I am still getting some vibration when the fan is on Med. or high. I am thinking of using some anti-vibration squares between the roof and the tray to eliminate any vibration.
Anybody have any thoughts or comments?
ndtiger
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fireman148
Collierville
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Joined: 06/04/2008
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Look on the inside radius of the fan blade and make sure you don't have any dirt dobber nests that could be throwing it out of balance.
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ndtiger
Vicksburg, MS
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Joined: 12/29/2004
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Good tip. I would think I would have noticed that when I had the cover off but maybe not. I will check again.
Anybody else?
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pkunk
Questa, NM
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Joined: 12/28/2007
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Probably not a cause for vibration, but while you're under the cover, check to see if you have a couple of oil ports on your motor shaft. They require periodic drops of oil.
1989 Allegro, 30 ft., 454 CI 4 BBL, 3 spd.auto, 125gal.gas tank,85g.water & 85 grey &75 black holding tanks. 3-12v Optima 31m coach batteries
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tvman44
Southwest Louisiana
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Joined: 09/25/2007
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It would not take a very large dirt daubber nest to throw the blade out of balance. Darn those little critters.
Papa Bob
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ndtiger
Vicksburg, MS
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Joined: 12/29/2004
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No dirt dobbers.
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Katdaddy
Petal, MS USA
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Joined: 08/25/2003
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Take the fan off and look again. I had this same thing happen a few months back. The nest was located where I could not see it while it was in the unit.
Little by little, one travels far - J.R.R. Tolkien
There ain't no surer way to find out whether you like people or hate them than to travel with them. - Mark Twain
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ndtiger
Vicksburg, MS
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Joined: 12/29/2004
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on the fan blades or somewhere else?
I can see all my blades and they are clean.
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Katdaddy
Petal, MS USA
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Joined: 08/25/2003
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On the fan itself. Mine was located where I could not see the nest while the fan was in the AC housing. I thought I could see the whole thing, but I was wrong. It was well hidden. May not be your problem after all but that was my experience. Good luck on finding the problem. I know how aggravating it is.
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ndtiger
Vicksburg, MS
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Joined: 12/29/2004
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thanks.....I think....I .....may....understand. 
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