Bosch Hammering - Page 5 - Recent Questions, Troubleshooting & Support

Ok here goes. Purchase or use the bearing cover nut 3613461500 that you have taken from the base of the machine. and drill a 6mm hole in it. remove the armature from the machine and measure how far the end of the armature sticks out of the bearing. then fit the cover nut onto the bearing holder and whilst supporting the cover nut use a puller or press to press the armature off the bearing through the cover nut. Replace the bearing in the holder and press the bearing and holder back onto the armature until the amount of armature shaft showing is to the same distance that measured in the first place. Hope this helps.

most common problems with these units is brush replacement, or even the on/off switch, I work for a home depot tool rental and are constantly replacing the brushes.

what caused grees to round down chissel from bottom of tool

Check your brushes. The brushes on the Brute breaker have a spring loaded, non-conductive pin in them. When either brush wears down far enough the pin pops out and prevents damage to the expensive armature. If by chance the brushes are OK you may have to have your armature tested.