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 - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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