Servicing Hobie rudder?

My rudder has a weird feel to it. It's just not smooth. It is very very stiff, and it feels like its getting caught up on something when I try to turn it. Is this something a simple greasing can fix, or something I might need to have looked out by a pro?

Another thing I noticed, is that if it's pointed all the way left or right and I peddle, it just goes forward. I have to center it and then put it back to the side to get a response. It also makes a noice like a clunk almost. Went out with another guy who has a PA and his doesn't do the same thing.