Galion roll-o-matic roller wont roll!

I am trying to help a friend get a roller going.It worked fine when it was parked a few years ago. Now he got it started but it wont move. The torque converter has fluid it it and it appears it works. The tag on torque converter says Clark. The shafts coming out of trans w/ the clutches does not turn. What does the part between the torque converter and the trans? It says it is a Governor? What is its function? I added oil to it, it was empty, can that stop rotation to trans? I am not very familiar with this machine, but I figured rotation has to go thru torque converter and the governor then trans. Thanks for any advice!! I dont have model # but it has a approx 4' dia drum on back and 3' dia. drum on front.