A bit beyond the original question about the spool valve, but I find dissasembly of the drive gear/ring gear was not obvious in the book. It took some solid drops of the assembly onto the end of the shaft to break apart. My wooden work bench has some sizeable dents due to this, and that didn't work. Had to bang the shaft end against some "soft" aluminum plate, sitting on concrete. The end of the shaft was ok, and the thing does come apart.
It is very typical after running with low fluid (due to HE leak) for the clutches to overheat and warp. Warp is evidenced by a slow spinning prop in neutral, for those that don't know.
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