Well on the 86 series depending on if it is and early or a late model depends on the hyd system . Early was and open center system and late was a closed center . The MCV controls your steering , brakes , T/A and your cooling and lube oil for the transmission and rear end. With the T/A lever stuck in high you can bet that the low side is OUT in the T/A and the cable is frozen . SOOoooooo with the low pressure on the MCV it can be that the MCV pump is toast or you have a massive internal leak either in the MCV or the T/A . This system also has a supercharges deal that sorta hooks the MCV pump with the rear hitch pump and has caused problems . The closed center hyd. system can be a nightmare as this system is not for the barnyard mechanic as it takes special equipment to work and test this system and i do not have the addition for my flow rater for this . There also could be a leak in the pick up tube in the rear end that at low speed the pumps will not pick up the flow till ya raise RPM . So on this you will more then likely end up spending some big money at a dealership that can do the testing . That addition to my flow rater i tried to get one at a closing I H dealership and drove for five hours to get the sale and chased to to over 3 grand and did not get it . BUT i did get a few things and two hot dogs and a pepsi .
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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