So I bought a very broken 743 skid steer the other day, and I'm going through it to try and fix everything. It looks like the left rear drive chain is either off the sprocket or broken. I was able to pull the front top cover with the foot brake on it and look down inside, but I couldn't really see back that far. Is there some sort of trick to getting a new chain on there or do I need to pull the machine completely apart? It looks like at least the valving is in the way, which I'm guessing is attached to the pump. If I do need to pull the pump, can I just pull the whole thing out as one piece easily? I do need to pull the engine out anyway, as it is broken. Also, does anyone have a service manual in pdf they can send me? I'm having not much luck getting one. Thanks.