not sure what the case is called gear casing what ever how do you remove it iv undone all the bolts cant get it off tho thans for help in advance martyn
First make sure all the bolts are out then give it a smack with a hammer. If you hammer up and down left and right on the end of the shaft that the clutch sits on it should start to move. Might be worth doing with a rubber mallet or something or just be selective about where you hit as you don't want to damage the end of it. You can also try hitting the rear wheel shaft but that's not as good of an idea as you can end up smashing it through the cases if you go too hard.