The way many different people have explained it to me (including two different hydraulic shops) is that fluid control in the valve is maintained by a very precise fit between the bore of the valve and its respective spool. It is metal to metal with very precise tolerances. The hydraulic shop mic'd the spool outside diameter and the bore inside diameter after disassembling the valve. If there has been enough wear over the years (which was my case), then the bore diameter may be too large and begins to allow fluid to run by the spool instead to through the milled passages in the spool. You have loss of fluid control. They actually tested my valve for this and confirmed that fluid was blowing by the spools. I've been told there are shops that can build the spool diameter back to once again achieve a nice and proper tight fit between it and the bore but it's very expensive to do so, like many times the cost of a new valve. If you had an external leak on your valve it could simply have been an o-ring replacement at the end cap. I didn't have an external leak. My leaks were all internal.
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Today's Featured Article - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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