underneath the tractor's tranny below the seat area their is a metal tube about 2.5 inches in diameter,take out the bolts on the left side and pull the screen filter out,clean it with some diesel and clean off any sludge,at the same time I would change the fluid and the main hydraulic filter,Alot of times you build moisture up in the tranny and it turns into slime and it can block the filter and possibally trip a relief valve,does the power steering work ?