John deere 336

Hi I just bought a 1 owner John deere 336 square baler that the owner baled 150 bales the day I bought it and it never missed a bale the bales looked pretty good. I am not sure if I am going to be able to use it this year and I have plains on cleaing it up and have it ready to go for next season by replacing all the springs, chains, belts, teeth, and paint it. I was wondering what the common wear parts are and common fail parts so I can repair replace while I am working on it. Thanks.

John deere 336