The center of gravity and the wheel spacing (track width) are the major factors that determine stability when operating on a slope. If you add weight above the center of gravity the center of gravity moves up and stability decreases. Increasing the rear track width increases stability.
I doubt that you can find any document that identifies the center of gravity location for your tractor, however it is not hard to make a good guess. If you are standing directly behind the tractor the center of gravity will be some where above the PTO - on center line with the PTO shaft but higher. To be conservative (on the safe side) lets guess it is a little above the transmission and at the seat mounting surface.
How to make a hill side tester: Standing directly behind your tractor aim the camera at the center of gravity and take a photo. Cut the bottom of the photo off even with the bottom of the rear tires to represent the tractor sitting on a level suface. Now make a plumb bob with a thumb tack, piece of string and a fishing weight (or any small weight). Stick the thumb tack through the center of gravity such that the plumb bob stays vertical when you rotate (tip) the photo.
How to use the hill side tester: Take the tester to your favorite hill side, ditch bank etc. and tip the photo until the bottom edge lines up with the slope of the hill. The plumb bob represents the weight of the tractor acting through the center of gravity. When the string touches the inside of one of the rear tires the tractor is very close to rolling over.
Why make the tester: It will illustrate the forces involved and show that a moving the rear wheels out is very significant to stability.
Now to the question of weigh: If you want to add fluid to the rear tires I would agree with several of the other posters, fill to the 12:00 position. This will provide added traction which is also important when operating on slopes. The change in the center of gravity will not be significant in comparison to setting out the rear wheels.
Enjoy your tractor....safely.
This post was edited by Indiana Ken at 16:58:34 01/06/15.
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