Hi all I am new to this forum and look forward to some good discussions but at the moment I need help please. I bought a ck20 about a year ago and I have done some work on it over the winter and it's in reasonable condition for its age. Anyway today my son was rotovating and he got the rotovator jammed in a large rock and pto just stopped. Pto will not engage and is free turning does anyone know if there is a shear pin somewhere or have I got bigger problems. Hope someone can help