I have a 1955 Ford 640 Tractor that I traded for three old suburban riding mowers that needed restoration. The Tractor engine has been rebuilt and everything works but the hydralic system. I have been reading alot from this site from people that had the same problem. So far I know the outside mount piston pump is putting out 2500 psi at the bleeder plug by checking it with a guage and plugging number 7 hole on the accessory port. But I get no pressure out of the accessory test port #2. I check the unloading valve and it was stuck ands I free it, but it didnt help. Any body have any Ideas? Thanks in advance.