If you had the pressure and return lines backwards the loader would not work. The valves would suck all the way in one direction and you would not be able to recenter them.
It's likely the valve is leaking internally. It's probably not repairable, as these valves rely on the lapped steel-on-steel fit of the spool and body to provide a seal. O-rings are only sealing between the valve and the outside world. Decades of cycling the spools back and forth have worn both the spools and their bores.
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Today's Featured Article - Search For Spares - by Anthony West (UK). Following on from the aquisition of the old Fordson F, I was very much in need of spares. As a novice though I didn't appreciate the fact that there were so many Fordson tractors made, that all the other makes seem rare by comparison. As far as I was aware a fordson was a fordson and it was only through trial an
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