this is my baby, we have one for breaking ground when digging holes for posts etc
http://www.ebay.co.uk/sch/i.html?_nkw=b ... &_from=R40cant find a pic of mine, or the exact model of mine, but its one of these, probly about 10 or 15 years old, and it's a heavy duty piece of kit, LOVE using it
powered by a 4 stroke Honda engine, which runs a cool little hydraulic pack, all in one little 18" cube, complete with petrol tank, and it really packs a punch ! with it is hydraulic lines which plumbs into yer hammer, it makes mince meat out of most hardcore/concrete, although we have come up against it on 2 occasions where the stuff we were trying to break up was like a fookin new material, unknown to man, was fookin TOUGH stuff ! although we broke through it in the end