In another try at solving the jerking action. Want to pull the charge relief vale and acceleration valve out to clean/check but cannot get to either of them without pulling the whole rear end. First thing Is the deck has to come off. Don't look like any real big job. Getting at the bolts will be the hardest. I have a feeling the charge pump relief valve spring is a little weak and allowing the cone to bounce in and out. Shim should solve the problem - - - I HOPE ! Anyone been into one of those Sundstrand Hydro's? Not going any further than the pump itself and check the pin. It may be damaged also. What do you think? New territory for me.