I have a 93' model 5610 I bought used about 2 years ago. Tractor is in excellent shape for it's age and steers well, but I keep losing fluid from reservoir. Reservoir does not leak anywhere I can see. Know about seal in pump possibly leaking fluid into motor, but motor never seems to gain oil on dipstick. Previous owner looks to have replaced PS cylinder on front end so no leaks there. I recently changed pump with another to see what would happen and now I am losing fluid even faster. If you run tractor 4 hrs. raking hay, will need at least 6 ounces or so to fill reservoir full. The only oil I can find anywhere is underneath tractor on bottom of bellhousing. Oil is clean so I know is not a leaking rear main seal and trans and hydraulics always stay full. My question is this, can steering motor be leaking oil into bellhousing where it can't be seen? Has this happened to anyone else? Aggravates the heck out of me when I know something is leaking and can't find it. I guess I could put some dye in PS oil and see where it leads me too. Thanks for any thoughts on this.