How to remove the piston assembly on 11230EVS

[zbad]

I have my Bosch 11230evs drill disassembled and have diagnosed the non-hammering issue to the crank arm being broken from the hammer piston. How do I disassemble all of the components of the Impact housing, specifically the guide tube.

[Magyver]

This appears to be a common problem, but I too am unable to get any information on how to do this. It appears to me that the main bearing needs to be removed, but don't know how to do that either. I might have to take it to a machine shop to get the bearing pulled.