Pay close attention to Lil Hoss on this his post helped me quite a bit.

The ramps inside the pulley can get dry and grab and try to weld together or get pitted and not slide smoothly across each other. In my case my issues were not so much misalignment with anything but wear in the bushings inside the intermediate pulley and rough spots on the sliding ramps inside that change the speed that were grabbing and releasing as well as some slug feeding of green stemmed beans.

If the ramps get rough or dry from lack of grease they can grab and release instead of sliding smoothly which can transfer shock loading to the cogged belt and 4 segment belt which can damage either of them.

If you need to take this variable pulley apart BE CAREFUL as there is a lot of tension on that internal spring. Make sure you get informed about how it comes apart and what to expect.

It's good to speed up and slow down the cylinder speed a few times a day to keep grease distributed on those ramps inside the housing.

Slug and uneven feeding can also cause shock loading of these belts.

Here is a earlier thread with a lot of good info. on it with additional things to check and look for.

http://talk.newagtalk.com/forums/thread-view.asp?tid=62445

Special attention on the Lil Hoss post about the greasing procedure in that thread.

http://talk.newagtalk.com/forums/thread-view.asp?tid=62445&=1#M440409

 There is also a procedure for filling the cavity on the intermediary pulley which is not well defined in the earlier books.

This is a copy and paste from my Titan II combine wiki. (now offline)

I'm sure others will be able to elaborate more on possible issues.

Other threads with same info. and other discussion on this.

http://talk.newagtalk.com/forums/thread-view.asp?tid=573828

http://talk.newagtalk.com/forums/thread-view.asp?tid=514447