This is my first post here. My Grandfather passed away last November. He left me his Massey Ferguson 135, I don't know the year. Ive used the tractor from time to time but, he did all the repairs if something happened. I used it last fall to grade his driveway and the 3 point lift worked fine. I tried to use it this weekend after it sat all winter to grade the road and the 3 point hitch wont do anything. I drained and changed the hydraulic oil which had a lot of water in it. I can lift the 3 point up by hand. There is no pressure on it at all. I was going to try to clean or change the filter today using the information I found on this site. Any suggestions before I start into something I really don't know anything about? Thanks in advance for your help!