Put the ATV in first gear. That will keep the collar from moving around the shaft, that comes out of the 5 bolt bracket (it's a bearing housing). I was able to twist the collar off by hand. Then I removed the 5 bolts and the bearing housing came out very easily. When that goes back in, you have to pay attention to the torque specs on those bolts and the cover as well. Then you can clean the entire gasket surface, and put a brand new gasket on. Just finished it up today.