To get that slow it will need a fairly large hydraulic motor. Also a large motor makes more torque.
It's all in the math, motors are measured in displacement volume per revolution. You'll need to know the pump displacement at x RPM.
Then determine the speed the PTO needs to turn to get the desired ground speed. Match that to the speed the motor needs to turn, which can be adjusted with the chain sprocket ratio, engine speed, and a flow control valve if needed.
A lot to consider, but much better to work it out on paper than buying and installing the wrong components.
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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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