As to why they are not common for tractors to have a full suspension... Front suspension is very common on todays tractors, even the big articulated tractors are starting to have it. But the suspensions are usually computer controlled hydraulic to be able to not start hopping. If you think about the rear of a tractor, there are many more loads involved than simple tillage draft. What happens with 3pt implements? How about a front fold corn planter? In the field, there is very little weight on the hitch, when in transport, you can come close to overloading the rear of the tractor.
With the amount of traction involved on a hard pull, by the time you dampened a suspension enough to stop power hop, you wouldn't have much suspension left. On semi trucks, the heavy haul go to suspension was a Hendrickson for years. A hendrickson suspension is basically no suspension. There are walking beams for the axles, and really heavy springs that don't give all that much.
I would suggest if you want to improve the ride of any tractor, figure out your rear axle weight for the common jobs you do. You can then set the air pressure in the tires accordingly, this will make a big difference in the ride. I bet your tires are overinflated most of the time now.
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Today's Featured Article - Grain Threshing in the Early 40's - by Jerry D. Coleman. How many of you can sit there and say that you have plowed with a mule? Well I would say not many, but maybe a few. This story is about the day my Grandfather Brown (true name) decided along with my parents to purchase a new Ford tractor. It wasn't really new except to us. The year was about 1967 and my father found a good used Ford 601 tractor to use on the farm instead of "Bob", our old mule. Now my grandfather had had this mule since the mid 40's and he was getting some age on him. S
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