Me again. I should like to add a little to my explanation. I didn't go into the teledepth valve very far. When these tractors were brand spanking new, we had a lot of trouble with whining, sizzling hydraulics and burping along with poor accuracy of the hitch. In other words when you moved hitch up a little it went too far or down too far. That part was basically corrected with the new rod style linkage over the original cable linkage. Converted a lot of them. Far as the burping, well, here is what IH did and it helped a great deal. Inside the teledepth valve, they cut a groove in a crescent moon shape. It matchs the regulating land on the spool and makes for a smoother cutoff of the flow to the orfice in regulator. This can be seen by taking the top off the valve and looking . You will have to look under the diff gears and move the valve spool forward by moving lever. If it does not have that groove machined in there I doubt if you will ever get it to work well. The part number was advanced on suffix or changed, don't remember that. Now, far as drilling orfice, like I said before, original was .031 with check ball and hardened seat. Replacement was .031 without check ball and no hardened seat. The 300 and 400 tractors had a .024 orfice but replacement is also .031. I have drilled many. Usually to overcome system going on high pressure when it warms up and then of course it gets very hot. You are expermenting when you start drilling. I have a set of wire gauge drill bits that run from number 80 to number 40. They move in small increments. So, if you start drilling that orfice you start by going only about .005 larger at a time. I figured this out by studying the operation of the system in the book and decided that is the valves wear more fluid will pass the control land than what can go through that orfice, therefore I started drilling them out. Later, I found that a lot of mechanics were doing that also. I also hooked them to a flow rater if possible when I did this and warmed them up really good to make sure everything still worked properly. Too big a orfice and system will not operate on demand it will just stay in low pressure stand by mode. Good luck.
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Today's Featured Article - Uncle Cecil's Super A Lives Again - by Mike Purcell. A week or so out of most of my childhood summers was often spent with my Uncle Cecil and Aunt Sissie in the small East Texas town of Maydelle on their 80 acre farm. Some of my fondest memories of these visits are those of learning to drive a tractor at the helm of Uncle Cecil’s 1948 Farmall Super A. Uncle Cecil was the second owner of this wonderful little tractor, but it was almost as though he had adopted an infant. The original owner was a man from Minnesota who bought her from a local dea
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