I did a quick mock-up to figure out the geometry and pivot points. It will take at least a 12" stroke cylinder to get 48" of lift. It sticks out about 48" past the back of the tractor when lifted so it will have a lot of leverage and take quite a bit of front weight to hold the front end down. Ag-Krane makes wheels to go on the bottom of their cranes to help on small tractors. I've thought of adding heavy casters to act as wheelie bars.
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Adam
1964 Model 100 w/ K301 12hp and custom hydraulics
1972 Model 149 turned 129 w/ K301 12hp, triple hydraulics, 66 series clone
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