08-07-2006, 04:09 AM
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Deity
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Join Date: Jul 2004
Location: Saint Regis Falls, NY, USA.
Posts: 5,306
Thanks: 0
Thanked 148 Times in 143 Posts
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check for a loose tightening bolt on the motor frame. if its a belt drive, this bolt tightens the belt but if it's loose then the fan motor will bounce around. if it's a direct mounted squirrel cage fan, check to see if it is moving on the shaft and hitting the housing. if this is the case once you tighten the fan on the motor shaft use a second allen head set screw to lock the first one on the shaft.
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