low/no charging

Ok, new 60A alternator ordered :-) But one more question for you. Just for fun I'm trying to open the old one. I have unskewed the 3 skrews and pulled the pulley off. But I can't separate the two halfes. It feels loose, but It seems like something is holding It back.. Is the two halfes like the pulley? (push to fit) or is there something else I have to remove? I don't want to break anything in case I can repair this alternator. This is a squareback.

EDIT; got the two pices separated. Just needed some muscle ;D

Here's some pics of the brushes etc. What to you guys think, does this look like the cause of it not working? Should I try order a repair kit?