I've got the same set up you have but herein lies the confusion. The supply to aux valve comes from a port on the top of the main 3 spool valve. This port is directly above the return port to tank and the returns for both valves run to tee and back to tank. This appears to be a parallel supply to the aux valve. Normally it would be in series, unless there's a work after device in the main valve supply port to the aux valve. I rigged pressure gauges to the work ports on the aux valve and saw no pressure. Valves, fittings and lines all appear to be factory IH and match the IH IPLs. The blade hydraulics all work normally.
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