UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Bosch CSB 850-2RET hammer drill

GMB · 18th Oct 2021, 9:36 pm

I am struggling to repair (again) this hammer drill. The problem is that the motor is not going round very well (feels stiff and lumpy) so either something is stuck in it somewhere or the bearing at the brushes end is damaged (maybe this).

The problem is that it will not come apart. As best I can tell from a video in Russian, after the gearbox takes off (done) the rest of the gearbox should just pull off taking the rotor and end bearing with it. But it is stuck and I can't see why or how to sort it.

My worry is that the bearing has got hot and glued itself to the plastic that holds it. The brushes end is just a part of the plastic body, so nothing to take off.

This job has just gone up in significance as I discover that drills of this specification no longer exist!! So I am reluctant to enter the "do or die" phase until all avenues have been explored.

18th Oct 2021, 9:36 pm	#1
GMB Dekatron Join Date: Aug 2003 Location: near Reading (and sometimes Torquay) Posts: 3,095	Bosch CSB 850-2RET hammer drill I am struggling to repair (again) this hammer drill. The problem is that the motor is not going round very well (feels stiff and lumpy) so either something is stuck in it somewhere or the bearing at the brushes end is damaged (maybe this). The problem is that it will not come apart. As best I can tell from a video in Russian, after the gearbox takes off (done) the rest of the gearbox should just pull off taking the rotor and end bearing with it. But it is stuck and I can't see why or how to sort it. My worry is that the bearing has got hot and glued itself to the plastic that holds it. The brushes end is just a part of the plastic body, so nothing to take off. This job has just gone up in significance as I discover that drills of this specification no longer exist!! So I am reluctant to enter the "do or die" phase until all avenues have been explored.