It's pretty simple in regard to how it works. When set properly and you encounter a gully or low spot, the mast puts pressure on the load yoke and shaft pushing it to the point where it causes the rockshaft to raise until the pressure is relieved. Once you get out of the low spot, the decrease in load on the yoke allows the rockshaft to settle to the preset position by the rockshaft control lever. Basically it keeps you from having to manually raise or lower the rockshaft when uneven terrain in encountered while plowing.
I used this hitch setup on my 630 with 3x14" F145H and with my 720D and F145A this fall. It works great, just as the JD engineers designed it to.
Without this setup, the rockshaft is manually controlled by the operator only; you have to be quick to keep from spinning out or stalling when encountering uneven terrain.
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Today's Featured Article - Memories of an IH Super A When I was ? up to 10, I worked on my Papaw's farm in Greeneville, TN every summer. As I grew older (7), it was the thrill of my day to ride or drive on the tractor. My Papaw had a 1954 IH Super A that he bought to replace a Cub. My Papaw raised "baccer" (tobacco) and corn with the Super A, but the fondest memory was of the sawmill. He owned a small sawmill for sawing "baccer" sticks. The Super A was the powerplant. When I was old enough (7 or 8), I would get up early and be dressed to
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