The problem is that the factory setup was a whole bunch of stuff that all had to work together. They installed a pressure relief valve in the two loader valve supply lines. This valve was different if you had power steering or not. So if you accidentally ran the tractor without hooking the return line back up it would not blow a line. Then there where three different Hydraulic valves used that I know of. Where you find them in the parts system now it is on computer is beyond me. I helped a parts guy look for a half an hour and we never did find them in the computer. He went and got the old Microfiche cards out.
I don't have the service manual on this tractor. I would need to look at the hydraulic flow chart to make sure you can get a external valve to work without any problems. The issue is that the hydraulic system on this tractor is a open center one. Meaning that the oil has to flow all the time. So when you tie into it you have to do it right or you can make something be blocked or have an open circuit in it where nothing will work.
Have you even found a loader yet that will fit??? You luck out and find one that came off of a JD 650. But then the valve may have stayed on the tractor.
There is a Compact tractor parts yard in western Kentucky. I have gotten parts from them before. They may have the complete setup for a JD 650.
West Kentucky Tractor Parts 6375 Joppa Landing Road Kevil, Kentucky 42053
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Today's Featured Article - Old Time Threshing - by Anthony West. A lovely harvest evening late September 1947, I was a school boy, like all school boys I loved harvest time. The golden corn ripens well and early, the stoking, stacking,.... the drawing in with the tractors and trailers and a few buck rakes thrown in, and possibly a heavy horse. It would be a great day for the collies and the terrier dogs, rats and mice would be at the bottom of the stacks so the dogs, would have a busy time hunting and killing, all the corn was gathered and ricked in what we c
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