There is a "clamp on" dual that, as the name implies, employ clamps to affix them to the inside set of tires. They are used with flange axles. If the tractor has bar axles that are long enough, then a complete wheel/tire/hub assembly is simply slipped onto the end of the axle. Another method is to use a bolt on hub for the dual. Duals are especially useful in high HP 2WD tractors in order to get all that HP to the ground. Also for flotation, as mentioned, in both soft ground conditions and for cultivating row crops with big cultivators. Downside is their increased "rolling resistance" which eats more fuel. If you don't need them in a particular situation, then you're better off removing them. For cultivating, it is common to see duals, front and rear, set to track in between the crop rows. That keeps compaction down that can be caused by the combined weight of the cultivator and the tractor and also the spray tank/s that may be carried as well, usually on the sides or front of the tractor.
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Today's Featured Article - Memories of a Farmall C - by Monty Bradley. When I was a child, my grandparents lived on a farm owned by a Mr. Walters. The crops raised were cotton and soybeans, with about forty head of mixed breed cattle. Mr. Walters owned two tractors then. A Farmall 300 on gasoline and a Farmall C, that had once belonged to his father-in-law, and had been converted from gasoline to LP Gas. Many times, as a small boy, I would cross the fence behind the house my grandparents lived in and walk down the turn row to where granddaddy would be cultivati
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