I have an old 315-11441 Craftsman Drill. I took it apart to fix the switch and in the process something must have shifted in or around the gearing. After putting back together when I power the drill I hear...
With these types of electric motors there is an armature, (the main brain of the motor) it has all the copper wiring wrapped around it and slides between two carbon brushes into the armature housing. If you took out the armature, there is sometimes a very thin peice of metal at the top of the armature which slides into the plastic housing above the armarture and creates a spring loaded "seat" for the armature, if this little shim looking thing fell out, you will need to find the old one. Without this tiny peice of metal the armature in the motor will have play in it causing the brushes to wear to one side or the other prematurely, the brushes have to wear evenly. Sometimes the brushes are spring loaded as well for a self-feed type deal. If these springs are missing the same thing will happen. Also one or both brushes could be in backwards. Check and make sure the brushes (black carbon and rectangular shaped) are positioned to support the spin of the armature. Lord, I hope this helps. I worked with small electronic motors over 15 years ago. I worked at the place for a few months, and didn't think I still remembered everything,
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