Posted by karl f on February 17, 2010 at 21:11:08 from (172.162.103.48):
Does anyone know if a valve is made to control a cylinder the same way a 3 point quadrant operates? Where the position of the lever equates to the position of the cylinder in the lift range. stay with mechanical hydraulic devices for now, electronics don't exist for this topic ;) I am curious for educational and future reference reasons.
The closest readily available devices i've found so far are power steering valves of the non load reacting type. However, they are not directly tied to the cylinder in a way that guarantees the same cylinder position every time the control is placed in the same spot AND the input turns to output ratio is too high.
How does the touch control valving on a farmall c control rock shaft position? What's the correct technical name(s) for the type of valve? Same questions for Teledepth--how it works(i've heard it doesn't) and what's it called? Back to the touch control, is it reliable returning to the same spot? How about the 3 point on a big 4x4 with external cylinders. How does that system work? what are the controls like, do they even have draft control? i've never been in the cab.
Without knowing about the big 4x4s, seems like what i'm trying to visualize with the hydraulic control valve would end up being similar to teledepth. So what's out there in parts needed from common hydraulic suppliers and manufacturers? Is there a way such a system could be reliable on par with 06/56 series position control?
If you were to use the control, required plumbing and mechanical devices on a 3 point retrofit of a classic farmall, would they become overly bulky and complicated compared to using common open center double acting lever valves? Or could it be done about the same as typical? Cost wise, would it be slightly higher than common way or high enough that a newer tractor factory equiped would be more cost effective? I already have a hypothesis on the money--get a new tractor. so for the sake of learning lets discuss what would be entailed to do this anyway. My mind needs some technical stimulation
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