Im using an old ford power steering pump, i had it laying around it, has its own reservior, but pressure side out of pump is hooked to pressure inlet side of steering valve, return side of steering valve is connected to low pressure hydro line, and the supply line close to hydro pump is connected to return side of ps pump, and a bleed line is connected to reservior on ps pump to reservior hydro tank.... essentially the ps stteering pump is connected exactly like oem pump........... lets say someone put the incorrect steering valve in the tractor but would that cause the pressure to build up, forcing hydro fluid out of both power steering pumps? Oem and the ford? Ive replaced seals and bushings twice in oem pump and it worked great until i used the front loader heavily, then fluid would start filling up crankcase.... is there anyway to identify the steering valve as open center or closed center?