I just picked up a 1988 Grasshopper 1822K. The gentleman I got it from said he had previously sold it, got it back when the guy tried driving it with the parking brake on and snapped the input shaft for the left hydro. He replaced the input shaft and then it started getting weak. He didn't want to deal with it anymore and then I bought it. Come to find out it works great in reverse. Just has no power going forward. I looked all over the intraweb for possible causes. (This is an Eaton Model 7) Main two being a stuck check valve and a bad cam ring in the pump side. I just finished tearing it apart (yes I made sure the balls stayed in place). Now I can't find anything that jumps out and says I'm the problem. Two things I noticed while tearing it apart were that the input shaft rocks in it's bore, like the bearing is worn out. And there was a very small part missing from inside the case. Which is the "button" Page 15 fig. 38 here> http://www.scribd.com/doc/50699099/WheelHorse-Eaton-model-7-service-manual It seems like that button wouldn't really have much of an affect on the operation of the pump though. Maybe I'm wrong. The balls and races all looked good, the check balls move freely in their bores (I have no idea if they seal properly though). I guess my next step would be to order new seals, that button, input shaft bearing and some new check valves and replace them to see if it fixes it. Anyone else have any other ideas as to what it might be?