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 - Old Time Threshing - by Anthony West. A lovely harvest evening late September 1947, I was a school boy, like all school boys I loved harvest time. The golden corn ripens well and early, the stoking, stacking,.... the drawing in with the tractors and trailers and a few buck rakes thrown in, and possibly a heavy horse. It would be a great day for the collies and the terrier dogs, rats and mice would be at the bottom of the stacks so the dogs, would have a busy time hunting and killing, all the corn was gathered and ricked in what we c
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