Help needed

Hey Gramps, welcome to YT!! I'm not familiar with Wheel Horse tractors, but did happen to find a couple of links that I think might be of help to you. One is on a competing forum, so hope I don't get in trouble for this, but it IS a forum dedicated to Wheel Horse tractors:
http://www.wheelhorseforum.com/topic/12422-702-with-hydro-2/

The other link has to do with an Eaton transaxle that is used on many Wheel Horse models. Wasn't exactly sure if you were asking about a transaxle unit itself or a lift system - or if there's even a difference. Haven't read through the Eaton .pdf but am assuming any hydraulic lift on the unit would be powered from an output from the transaxle unit, so hopefully this will help:
http://wh.classickitchensandmore.com/Manuals/91 520 H/ea11wh.pdf
 
Also, if the hydraulics system runs off of the transaxle, then look at other transaxles with outputs for what oil they use.
 
Well, not enough information to know what hydro unit it has. Can you post some pictures?

If you can get a sample of the oil out, enough to get a feel for how thick it is, that will be a clue.

Some use thin oil, like ATF, others use heavier oil, like 15 w40 motor oil.

If you can't identify the model, you can try to match the oil by feel.

Now, I'm just guessing here, so make your own decision, but I don't think they are all that particular about the oil.

Once you get it full (and that doesn't mean "full to the top"), there is probably a level plug, somewhere near the top, but not so full there is no room for heat expansion, the bleeding process is to raise the drive wheels off the ground, put it through the motions, forward and reverse. Let it run a few minutes in both directions, that should get the air out. If the oil is frothy, letting it sit overnight will clear it up, then recheck the level.

Again, there is a lot of guessing here, so proceed at your own risk. If you can find more numbers it would be possible to find the factory recommendation, but if not, gotta do what you gotta do!

Hope this helps!
 
With that kind of info this is all I got. These two Wheel Horses are both the same year, both have Eaton hydros, one hydro takes 3/4 qt. of sae20 motor oil, the other takes 5qts. of 10w40 or 10w30. Used to have a 1969 with a Sundstrand hydro.
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