The first picture was taken from the front, so the right side of the picture is the left side of the tractor. The line marked in green is the one that goes over to feed the remotes. On your 2-85, that should be a steel line that wraps around the back of the unit, instead of the front like on this 4-225. You won't need the needle valve like I have unless you want to disconnect the remove the loader valve with the loader. Just put the T in where the red line is, which is right in front of the left side of the three point rock shaft. You could also follow the steel line around to where it goes into the remote valves, and add your T there, but I think there is less room in that spot. Hook the new line to your closed center loader valve, and have the return oil go into the reservoir at the back lower left corner, and you should be set. There aren't any adjustments that need to be made to the hydraulic system. The pump will automatically compensate the flow to keep the system pressurized.