View single post by David Hoatson
 Posted: Sat Sep 12th, 2020 11:27 pm
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David Hoatson

Joined: Sat Oct 5th, 2013
Location: Chestertown, Maryland USA
Do I understand that you are running it with one brush? Never do that. It will destroy the commutator. 1st thing: put new brushes in it. Get them at a hardware store or McMaster-Carr. If you can’t find the right size, get a larger set and file them down. 
The blade must be on when you run the fan, as others have said. 

The blade needs to be aligned so that the leading and trailing edge of each blade wing are exactly in the same position in/out. A bent blade will cause the fan to rattle. 

Shim the armature (rotating part) so there is about 1/8” free play in/out and so nothing makes grinding noises when you spin the armature by hand pushing it all the way in, then all the way out. 

The brushes slide in plastic sleeves that insulate the voltage from the housing. Check to make sure these don’t touch the commutator. Close is good, as it supports the brushes.