I recently bought a 60 inch exmark that needed work. One thing that needed to be fixed was the right side hydro pump, because it was missing. (Previous owner used this mower as a parts vehicle) i purchased a brand new one and installed it, it worked perect for about 10 hours and all of a sudden i lost all hydraulic pressure. After looking I found my entire pulley compartment full of fluid. And i found that it was all coming from around the shaft. Being the pump was under warranty the local dealer replaced it out for a new one. However after installing the second new one it did the same thing with less than an hour on it. Anyone have an idea where i can start? It seems that it happens when the mower is running but not moving.