I have a 782 that was sluggish . It wouldn't move till I had the hydro lever about half way and sometimes not even then . Then it would jerk forward and the hydro lever would chatter . I thought the trunion was bad until I put a pressure guage on the hydropump and seen the pressures were way down .
I thought the pump was getting weak but then I noticed that the previous owner had put a perolator filter on it , and after seeing that I decided to try another filter .
I had a new Steins hydro filter that had a toro/wheel horse part number on the box and after doing a little research discovered it crossed over to the cub cadet 923-3014 hydro filter . After changing the filter i noticed an immediate increase in the pump pressure . Now it moves with just a slight movement of the hydro handle and is smooth as silk .
It also used to freewheel downhill , the new filter also fixed that problem .
So I guess the pump was getting starved for fluid .
So either the perolator was the wrong replacement filter or it was more likely clogged .
I have a gentleman thats buying it and he seemed please when I informed him that it doesn't need a trunion repair .