I have Super Z with the xr7 deck and the 31 hp motor on it and I was wondering if someone could give me some info on rebuilding one of the hydro pumps on it or direct me to a thread that already has this info. I'm pretty sure its the pump that's going out. The mower doesn't like to be loaded on the trailer at all and struggles going up hill some. Could it be the drive motor on it? Thanks!