[CubyFan]

I'm fixing up a 1641 for the FIL but can't figure out what the problem is with the hydro trans. The forward/reverse arm moves about 3 inches before the hydro trans moves the tractor. This results in a jerky response and never reaches full speed in forward or reverse. It seems to be a problem in the trans itself because the linkage does move the hydrostat control arm. I don't see any play or problem in the linkage and I tried to adjust the neutral and forward reverse linkages...no help. Changed the hydro fluid and filter with no effect.

I know there are lots of posts on hydro problems on the site but I did not find what I needed. Any help would be appreciated. I included a couple of picture just because we like them here.