you said the laoder runs off the tractor sump.
but then you said it does not use the back end / 3pt sump.
the rear end and hyds are ommon on that tractor.
it either has a front stinger pump off the crank shaft snout and has it's own on loader sump. or it is run off the rear , side, engine mounted pump that uses hyds off the top cover.
what do YOU have?