I recently bought a 2N. Previous owner said lift wouldn't stay up. I replaced the lift cylinder and piston. When just using lower lift arms and a draw bar it has a lot of lifting power and will stay up and not drop down over time. But, when I attach an implement to the top/center link, it wont lift so much as a grader blade. Someone told me it's probably an adjustment but I don't know what to adjust. I thought maybe the draft control yoke but, it's seized (another subject). Any advice?