Hi not done much with 820 I think the inside 2 near the steering wheel are external spools It might be one set piped to the back and t'd off to middle of tractor and one set to the middle only depends if guys added extra couplings at back. The 3rd lever should be 3 point I think and the 4th might be pressure control from memory i think push that 4th one forward and then back one click and then arms should work with 3rd lever watch that though, as the lift arm cylinder is double acting and if you push down with an implement on it will pick the rear wheels off the ground, if it works right. for position control there should be a lever by the side of the seat on R/H side that will bring the arms up and down to but the draft unit under the seat has to be set right for that to work.the front lever overrides this function. I have a book here someplace for this tractor if your stuck let me know and i'll try find it and help you more. I work a lot on the newer series and they are totally different. Im remembering this from an old 500 series I think thats about the same only the position lever is on the steering wheel tube opposite the stop lever on those. Regards Robert
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