New holland 650 take up arm

I replaced the bearings in my take up arm rolls on my 650. Trouble is I can’t get the take up arm to extend for some reason to get the pin Under the arm to let the tension back off belts. I left the belts in and used a hose connected to tractor to work the take up arm. I loosened the tension off the tension cylinder I just don’t know why when I raise the gate all the way up then work the arm it doesn’t move. Any tips? Do I need to loosen spring on bottom of tension cylinder?

New holland 650 take up arm