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 - The 8N and the Fox - by Zane Sherman. Dec. 13 1998, Renfroe, Alabama. Last niht I dreamed about the day that I plowed the field of about 10 acres over on what Jimmy and Dandy called the Ledbetter field. I was driving the 1948 8N Ford tractor that Jimmy bought in 48 new This was prebably in about 1951 and maybe even befor the house was built. This would have made me to be about16 years old and I drove the tractor for nothing and would have paid to drive it if I had had any money which I didn't, but neit
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