my 1996 416 hydro , dont seem to want to maintain a constant speed , they hydro lever (make it go foward an backward) insted of the 12 o clock position it should be in for high speed, it drifts down to a 2 o clock position . i think i need to adjust linkage. it will climb a slope when you barly touch the lever it moves slow but i can feel the trans working . any feed back would be appericated.. or if somone could link me to the hydro adjustment procedure. i couldent find it at toros website

Under the seat there's a cam plate. There's a 9/16" nut where the plate pivots. Give this a quarter turn, should help hold. Adjust until it's better.

ive tryed that, she dont seem to want to stay in the 12 o clock position tho

Check the linkage as well to be sure none of the spring / roll pins backed out. There isn't any oil on that cam plate is there? That adjustment should hold it.

nah theres no oil . im tryen to under stand they the lever wont hold in one place. I dont think its an internal problem . i love the tractor to death but man does it have me scratching my head

It sounds like the cam and cam plate is worn. Their not to hard to replace, you have to remove the seat and fender to get at them though.
Them parts are a little pricey. If I remember correctly it'll run ya bout 50 bucks. and bout 1 1/2 hours for the repair.