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Before you go to alot of trouble with valves. Take your auxillary outlet plug out and check to be sure the pump is supplying pressure to the system. Sometimes they will shear the pump drive key, or another problem could be that the filter has collapsed on the pick-up tube. If you have oil flow at the aux tap then I would check the check valve first because it's easier and is bad to stick. In the center front of the differential cover cover, right between your legs when seated and is recessed into the cover just above the differential housing facing forwards, almost dead center of the cover housing. Take the plug out and you'll see a small pilot stub. Take needle nosed pliers and pull this stub out, it's the check valve. You'll find a spring and ball behind the stub, take all this out and clean them good, also clean the seat and orifice good. I always use the spray brake cleaner. If it was'nt the check valve, then next thing would be the safety valve. Take the accessory plate/flow control off and you'll see a plug under the plate, take this plug out, it's the safety valve. Clean it and the orifice both real good with the brake cleaner. If it was'nt one of these holler back, there's more to check under the cover, but usually it's the check valve and then next is the safety valve. I would think it probly put trash up into one of these valves, that's what's most common.
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