Roris, my no means am I a mechanic, not alone a clutch expert, but this sort of adjustment is quick and easy for most anyone. (unless you haven't ever taken your clutch cover off before badcomputer bang your head ) First off, you won't need to take the clutch off. On the secondary, simply back the hex head bolt out, and the small aluminum hub needs to be taken out of the secondary. I had to take a small screw driver to pry it out a bit before I could just pull and twist it out. Once this has been removed, you will see the shims (washers) and a rubber o ring. I believe I had one thin, maybe one medium and then a few thick shims. Just remove the o ring, (becarefull not to rip or tear it) and add whatever shim you need. Adding a shim raises the belt in the pulley, and removing shims lowers the belt height. In my case I believe my dealer gave me a thick shim and by adding this shim, my belt looked to be setting about 1/8" up. According to the manual, it looks like Cat wants about a 1/16th max, so I left the added thick shim on and removed a medium, which netted an add of one medium shim. (two medium shims are about the thickness of one thick. Again this is a approximation in that I didn't use my calibers) After adding your shim(s) put your o ring back on and place this assembly back in the secondary and tighten your bolt back to about 32 ft-lbs (pg 79 in your manual) You will need to start your machine and throttle it a few feet to engage the clutches to see how high or low the belt is going to ride. Most dealers should have shims in stock for sale. This whole process shouldn't take more that about ten minutes max. As far as the difference it made, as my belt broke in, the clutch would make a hard clunk sound when it engaged and at about 5-5,500 rpm it would shift hard and almost bog the engine down. After adding the shim, the clutches engage super smooth and you don't feel the drastic all of the sudden shift now. Again, I'm not a clutch guy, so take this for whats its worth and I hope this helps. If anyone in the know can add to this, please do, as I like reading the clutching posts. :thumbsup: