I just picked up a 706 tractor, and I am trying to change the hydraulics. I want to install a bucket and add lines in the back. I have 2 sets of lines in the back. Only 1 is working. The other set is hooked to a block at the back of the main valve. How can I get a pressure line up to a auxiliary valve for the bucket, and what is the 2nd lines in the back for?