like the others say,but the adjustment on the tongue is to OFFSET the disc to the side of tractor.allows you to work under trees and things while keeping tractor out of the branches. hence the offset in offset disc. used everywhere these days but originaly designed for orchard work. normaly you would have two ropes on that rig.one to set the angle or depth of cut ,the other to set offset. when working in a orchard you could simply pull offset rope and swing disc back behind tractor as you turned etc on end of tree row. pull it again and swing disc back to side when working other side of tree row. allows you to make far shorter turns at ends when implement is behind tractor. that disc appears to offset to right side of tractor ,so of course you would have to turn right to work both sides of trees.if it were far off set you would have to swing way wide to keep disc from hitting tractor tire.some you have to back up, some you dont,most new ones are hydraulicly set these days of course.the amount of offset you needed would depend on the size of your trees.
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