Depth will make a big difference and the type of shanks [twisted are usually on Glencoe Soil Savers].Most 4320 are around 120 H.P+.The 34 in rubber doesnt give the traction of 38s so I would say nine shanks or less would be about right.Anything larger and slippage would be an issue.They work best at around 5 M.P.H.+.I know they make them in seven but I havent seen many.A lot of good older equiptment went to the salvage yards for scrap.The addition of MFD on the 50 series made a 125H.P. tractor pull the same load as a 150H.P.+ 2 wd.Slippage in excess of 10% is wasted energy.I have seen 14ft. chisels behind 4020s but they are only going about 6in deep if that.
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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