My 28 ton, Honda driven Huskee has not met a log it couldn't beat up until today. Been through the ugliest, knottiest Oaks and Maples. Today it met a section of an Ash that was taken down recently. It was alive at that time. The section was where most of the limbs split off the trunk. She just couldn't bust it, at least in one spot. Moved the log over 4 inches and it broke through. Never saw that happen before. Guessing the green state of the wood was a big factor.