Draft control

[ejtaylor822]

I have a similar setup on my Jinma 454LE, like Soundguy was saying, must be prevalent on the Asian manufacturers. We tried to figure mine out a while back. It sure looks like draft control, is some kind of feedback mechanism from the upper lift arms. But, when I asked the dealer, he said my model did not have draft control. I can say it's never functioned like draft control. I have tried to figure out but do not see how it would work.

 

[Soundguy]

I'm just guessing without at least seeing more of the pic.. I agree with your points. It's really hard to tell how it functions without seeing the inside of the lift cover... It may have an overide for manual lifting.. not sure.. might just be constant depth.. etc.

If we ever get more info.. we will know. ( like.. if there is a sensing rod to the implement.. etc..

Soundguy

It might work as you describe but I'm having a hard time envisioning how the linkage would work. Seems like the linkage (between impliment and sense control) would have to be set to work at a very specific height of the 3pt and since the 3pt arm piviot around a fixed point, how the sense link would only work with down motion of an impliment and not up motion above the set heigth.

Being an M.E. this isn't rocket science but still hard to envision exactly how this can work. Like you I believe this was intended to help control tiller depth and I'm thinking more like controlling a plow. I know how the draft controls work on U.S. design where top link senses pressure on the link and applies draft compensation depending upon how much pressure is exerted on the top link. Maybe the reality is I don't care if the sense control tells the 3pt to lift if I'm lifting the impliment anyway.
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[Soundguy]

And there are at least a few different versions of the 3pt implementation on those tractors. We were having a discussion on the 3pt lift a while back.. especially about their external lift limit adjustments, and as to whether certain models can damage the lift piston oring from overextension. It came to the point that there were som many variations on design.. that you couldn't generalize any. But could only talk specifically about a couple units at a time. The unti we had been talking about.. the owner posted many good pics and a schematic page.. for his setup.. huis lift piston oring could be damaged.. however another user brought up the fact that his (other) setup couldn;'t have the piston pop out.. by design... etc.

So there is deffinately alot of differences ont he 3ps in the asain market. Schematics or actual pics will be the easiest way to determine what actually does what.

Soundguy

I have a similar setup on my Jinma 454LE, like Soundguy was saying, must be prevalent on the Asian manufacturers. We tried to figure mine out a while back. It sure looks like draft control, is some kind of feedback mechanism from the upper lift arms. But, when I asked the dealer, he said my model did not have draft control. I can say it's never functioned like draft control. I have tried to figure out but do not see how it would work.

 

[3RRL]

Mickey,
Not knowing for sure on your tractor, but I've some with similar linkage....
When you move the link as described in your first post, the 3pt lifts or settles depending? Does this happen no matter where you set the position?
It might work as you describe but I'm having a hard time envisioning how the linkage would work. Seems like the linkage (between impliment and sense control) would have to be set to work at a very specific height of the 3pt and since the 3pt arm piviot around a fixed point, how the sense link would only work with down motion of an impliment and not up motion above the set heigth.
If so, my guess would it operates relative to the position of the 3pt setting. In other words, once you set the 3pt position, any movement up or down sensed from THAT position activates it?