Acquired an Oliver 770 that needed a hydraulic pump rebuild to drive the New Idea 503 loader. Note, the loader cylinders have pressure extension and return lines for each. I rebuilt the pump and every cylinder on the loader, put it all back together. As you are sitting on the tractor, the right side hydraulic hook-ups are for the main lift cylinders and are working ok. The problem is the left side rotation cylinders will not work. I know it's building pressure because when i crack the lines at the cylinder they leak presurized air and oil. I'm not sure what I'm doing wrong here but I need some help. Thanks Much!