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Message: <blockquote data-quote="Fishfiles" data-source="post: 52498" data-attributes="member: 782"><p>I know you don't want to here this one , but you are most probally over working the machine , a  grapple bucket and stumps can casue problems ----------- I asked the guy at the place that I get nut and bolt from about an harder bolt not long ago  , as I see a lot of broken Bobtack pins and asked for somethingharder and his theroy is that a harder bolt is more likely to sheer off than a softer one  he says that a bolt is made to hole things together ,  the load is between the head of the bolt and the nut  and not to used as a pin which holds the load on it's side , he says if you use a softer bolt it will bend before it breaks , I never took him up on that one but it seems to make sense------------- there was some changes to the bobtack pin bolts over here a few years back , the newer pins have the threads on the back side of the pin and longer bolts are used , is that what you have or is your pin threaded on the front side with a shorter bolt</p></blockquote><p></p>