Still thinking the control linkage rod is not adjusted properly. The reason i asked about the draft position is because the control linkage is used by the draft control for load sensing. in Other words, the draft control senses load change and raises or lowers the 3 pt accordingly. Mine was out of adjustment and I could raise the implements but at the top of the travel, the pressure relief valve was making noise along with the 3 pt shaking moving up and down. Correct adjustment fixed the problem.