This maybe a bit of review but do you have your draft control lever in D? L is load and the hitch will react to the load placed on it. LD is a mixture of load and depth and the hitch will be less resopnsive to load and more responsive to depth. D is depth and the hitch will no respond to varying loads. Loads in this case do not maen the amount of weight on the three point that you are trying to pick up but rather the amount of draft effort (pulling amount) that the bottom three point arms have on them. An example would be pulling a semi-mount plow which is only hooked to the bottom two arms. As the load increases, (draft) the sensing mechanism transmits the signal to raise the three point slightly.
The 2nd photo shows the position of the feedback roller if you are in D for depth control. This point is basically in line with the cam on the rockshaft and if the dash lever is the command input, the hitch reacts, and the cam (via linkage) cancels. The hitch holds that position.
The roller will stick out much further if you have selected L or load position. The cam has very little effect on positioning the three point when in this position. Varying draft loads, since the roller is now further down on the load sensing arm, do most of the control. Without load, the hitch will raise to the top in the last bit of lever movement and will drop to the bottom at the first bit of moving the lever to lower.
Photo 3 shows the feed back linkage. The right side is a simple differential (similar to a car rear end). The dash lever is hooked to the outside bevel gear, the feedback roller is hooked to the middle gear (spider, meshed to both bevel gears). And the LH bevel gear is hooked to the cam shaft to push the raise/lower balls off their seats. Command input rotates the RH bevel and thru the spider, rotates the LH bevel. This rotates the cam pushing open the correct ball to raise or lower. (Depends which way you moved the lever if you wnated to raise or lower) If in depth, the cam pushes on the roller which moves the spider. Since the RH bevel is held in position by the dash lever, the LH bevel reacts, the cam moves and the ball is returned to it's seat. The hitch stops at it's new position.
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