Mike - Can't tell you how much load is "too much". However the M/SM rears are pretty robust. My experience:
1 - My wide front SM plowed many thousands of acres while fitted with duals (the inner set loaded) and 2 sets of wheel weights. The only axle problem was when the tractor barrel-rolled down a steep hillside (fortunately less the driver) which snapped one axle.
2 - For 20+ years my narrow front SM harvested 500 - 600 acres of sweet corn annually carrying a 2-row mounted picker and pulling a Field Hand dump cart. Rear tires on this tractor were loaded. It is still running on its original axles.
Incidentally both tractors are now enjoying a well-earned retirement. They now pull only hayrides and run in an occasional firemens' parade.
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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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