I am working on my 1948 G and have Power trol questions. This tractor is new to me. I plan to be using a 101 corn picker on it and need the rock shaft to work. I replaced the pump housing, which was cracked. I have it back together with what I believe are the correct plugs in. The have the hole on the front of them. The rock shaft does not move. I can hear the engine work a bit as I engage the PTO. The pump gets pretty hot as if the oil is circulating around in it. It has new oil in it. I used hydraulic oil. I did take a klarge wrench and move the rock shaft into the down position. Where shuold I look next? Thanks, Paul