I'm a machinist so I have the tools and ability to take precise measurements. That being said, the flow control valve spool looks good having no flats worn on it and the bore/spool clearance measures only .003-.004 clearance. When I bought the tractor about 6 years ago I had the control valve spool out due trying to get to the bottom of just the opposite as now. At that time, I had good power steering but no pressure on the rear remotes. This was the first time I ever tried using the remotes. Upon flow control valve spool removal, I noticed the orifice in the flow control valve spool had been drilled way open(5/16") by a previous owner. I presume to improve power steering since it was a loader tractor much of it's life. Due to the huge orifice I don't think the flow control valve spool ever shuttled backing and forth causing wear. I think so much oil could pass through the over sized hole the spool was motionless many years causing no wear to it or the bore. So at that time, I tig welded the oversized orifice shut and drilled it out to first 3/32" then to and 1/8" to achieve some flow balance between decent pressure on my rear remotes and the power steering. This fix worked well and did so 'til last summer when my power steering started to deteriorate. Since then it's been process of elimination to conquer this problem. Any more thoughts? I appreciate the input.
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