Case 580K swing problems

I just bought a 580k phase 1 in an online auction sight unseen and it has some issues. I am fairly green so please go easy on me. It will barely swing to the left and wont swing to the right at all until i barely apply pressure to the boom hand controls. It then swings great both ways. I can just barely put pressure on any one of the 3 hand controls and it does this. I hope I explained this well enough. Thanks in advance I have some other serious problems but lets tackle this first

Case 580K swing problems