look at parts 20, 21 and 22 on the Parts Tree blowup of the hydro. That is the relief valve that the knob on the trans cover pulls against. I just scrapped out a 1641 tractor that wouldn't pull itself. That valve looked like it was depressed and wouldn't come back up. This was after the tractor was picked up my a fork lift.
I don't know why I can't post the image but it doesn't work and I'm out of time.
May not apply here but worth a look.
|