I have an 850 and looked into adding hydraulics years ago. The factory kit has not been available for years, and when they were available, I understand that they were very expensive. I exchanged emails with someone on this board who was attempting to rig their own setup, tapping into the hydraulic junction block where the JD selective valve would go, and then using off the shelf parts for the rest of the system. At that time, they referred me to a company in SC that was offering the modified junction blocks for $175, but they went out of business soon afterwards. I reviewed the hydraulic schematics in the service manual, and it looked to be pretty straight-forward to attempt it. I would think that a good hydraulics shop could rig the setup pretty easily. A good machine shop can probably modify the junction block pretty easily, just drill and tap two holes in the proper locations. I still have the 850, but I ended up with a bigger tractor with hydraulics. I see the SCV assemblies on ebay occasionally, but they want a fortune for them. Good luck with your search, and if you do rig up a system, please post photos for us.
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