Iíve just purchased a John Deere 485 backhoe attachment for my 4120. Does anyone have instructions or advise as how to install it on my tractor? I finally saved up enough to buy one after waiting since 2010 when I bought the Tractor. I couldnít afford it then. I hadnít quite saved up enough though to have the dealer install it so Iím going at it myself. I also had to buy the hydraulic oil cooler so it took up more $$ as well. Looking for help on this monumental task.