Christopher M.

After approximately six years and multiple houses built my Bosch 4100 died. It simply started to run very slowly. I started by replacing the brushes, no change, moved to replacing the speed control board, no change, then on to replacing the field windings and the armature. Bingo. When I decided to go with the field and armature I also ordered the bearings on either end of the armature, just because everything is opened up. With no real instructions it took less than two hours, scrutinizing the exploded view diagrams at eReplacement Parts was necessary.