G,Day zadch.
You are a competition Plowman Right?.
You know the principle of draft control?.
The massey Ferguson Tractor with the ferguson Hydraulic system which was developed in the forties and completed in the fifties and since then fundamentally never changed, it has been copied by ALL tractor manufacturers in one form or another with mixed success.
When using the Massey Ferguson draft control the tractor will AUTOMATICALLY control the draft depth that is it will automatically raise and lower the hydraulic three point linkage to maintain an even depth without the operators input in fact if you set the tractor in a straight line and set the draft you would not need HUMAN intervention the tractor would do it on it,s own.
Having been involved with Masseys and other tractors for more than 52 years Repairing and Demonstrating Massey products I will say as far as the hydraulic system goes there is no equal.
The first important thing is making sure the hydraulics are functioning as per design,that is does the position control operate correctly ,does the draft control respond correctly in other word step one is to check ALL Hydraulic Functions before you start .
Step two to get the best result, is to understand how the system works.
step three and the most important One is the setting up of the plow which may take some time as this involves a lot of variables , weather,tyre pressures ,tyre sizes,soil type etc this is only a few which I am sure you know about ,not forgetting the response lever which again depends on soil condition as to what response is best.
Your concern that the hydraulic system will be operating at relief valve pressure is not correct ,WHEN THE POSITION CONTROL LEVER IS PUT IN THE TRANSPORT POSITION AND LEFT THERE The hydraulic system will raise the implement to the transport position and maintain that height the hydraulic pump will deliver whatever pressure is required to maintain the height the lift arms have been set at .
If you look at the Draft Quadrant there are two lines about halfway down,if the hydraulic system has been set CORRECTLY the draft lever will be in between the two scribed lines when in Draft Neutral if not there abouts ,not more than 1/4" either way.
The fact that when the service man sets up the hydraulic system with the position control lever set in the transport position during the internal adjustment of the hydraulics it is critical for satisfactory draft control to ensure this is the case.
To install a Selector valve be it a two or three function unit it does not really matter if when plowing and you select remote or front end loader you will not have CONTROL of the three point linkage during the time the selector valve is in remote.
This is a fairly long winded anwswer to your question But I am sure yourself and others may find some value in my comments .
Happy Days:thumbsup:.
Hutch.