How to Replace the Carbon Brushes on a Fein Sander

Your power tool's motor uses two carbon brushes to conduct electricity to the armature. They do this through the commutator. The carbon brush will wear down over time from rubbing against the rotating commutator, and will need to be replaced. Worn brushes can cause excessive sparks around the commutator. Sparks can also be caused by a damaged armature, so you will want to carefully inspect both if sparks are present.

Let's get started.

REMOVING THE CARBON BRUSHES   1. Use a screwdriver to remove the cover on the underside of the handle.
2. With a screwdriver, remove the screw from the two wires and the brush holder.
3. Remove the brush holder from the housing and remove the carbon brush.
 

INSTALLING THE NEW CARBON BRUSHES

  4. Notice the wire lead is offset to one side of the brush.
5. Align the wire with the slot in the brush holder and insert the brush into the holder.
6. Place the holder back into the housing with the holder.
7. Route the brush wire back around the base of the holder.
8. Secure the wires and the brush holder with the screw.
9. Make sure that the brush wire is tucked back and out of the way.
10. Use a screwdriver to reinstall the cover on the underside of the handle.