OK, so I was mowing with my JD 2640 and the JD 717 in tow when the slip clutch went on the JD 717. I've adjusted it out (previous owner wore it out I believe) and it still is slipping horribly. What parts do I need to replace in the clutch. The JD 717 is a little different than most slip clutches I looked up online. Has the four bolts that you loosen to adjust the clutch slippage. Thank you. picture is what it looks like.