Zeb,
Perhaps your crankcase cover is slightly distorted because of overtightening. Check it against a flat surface, maybe the local areas around the bolt holes are bent down, which keeps the gasket between the bolts from being properly compressed. If so, you can straighten the bolting flange surface with a little hammering using a flat steel bar as a backup.I can't remember if the bolt holes in the case for that cover are blind holes or if they are through holes. If they are through holes, you should use sealant on the threads to prevent oil seepage along the threads. This has nothing to do with low oil pressure. Oil pressure can be adjusted, if necessary, by the pressure adjustment screw on the side of the pump (accessed through a pipe plug hole on the side of the main case). Low oil pressure may also be the result of excessive wear. Its pretty common to see the PTO shaft on an "H" rotating if the clutch is engaged, even though the PTO is disengaged. The thick transmission oil sort of "drags" the PTO drive gear along, as things are turning inside. Usually, this can be stopped by installing a new outer oil seal, which adds just enough friction to prevent the PTO from turning.
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