[jfinney]

I have downloaded and printed the information on hydro problems in the tech section, but had a specific question about my tractor. The hydro functions pretty normally when the throttle is about halfway or less. However, when the throttle is all the way open (cutting grass or blowing snow), the hydro will go full speed in a second! Even if I try to pull the lever back it will go back to full speed. Why is there a difference between WOT and halfway or less? Does it half to do with how much pressure is being generated in the hydro pump and different degrees of engine RPMs? I'd like to take some pictures and try to get this fixed up because this is my grass cutting machine.

Another quick question, with the hydro lever in neutral, should the big spring in the trunion be really loose (I can move it all around)? There are some grooves worn at the end of the trunion slot also. I am a novice welder. I read about using keystock to true up the slot dimensions. Would that be the preferred method for someone of my limited ability. I am sure I couldn't weld up the slot and file it back down without making a huge mess or wrecking something.
Thanks,
Jason