Bill Va, What I think you are asking a few simple physics problems.
The coefficient of friction is a ratio of the pulling force (traction) to the weight acting perpendicular on wheels. The coefficient of friction depends on tires, surface, weight and angle of hill.
The second part of your question seems to be a torque problem. When you add weight to a 3 pt hitch you transfer weight off the front wheels and apply the weight to the rear wheels. The opposite is also true when you try to lift something with a front loader. The torque created by lifting with a front loader will put more weight on front wheels and remove it from rear wheels. Torque is a simple thing to calculate, it's the weight, perpendicular, you are trying to lift times the distance the weight is from the fulcrum, which happens to be either your front wheels when using a loader or the rear wheels when lifting with 3 pt.
So yes there is a rule, Torque and coefficient of friction, but it a little more complicated. Get your high school physics book out and look up first class lever and coefficient of friction. George
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Today's Featured Article - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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