It always a good policy to not jump to any ideas that might have or have not caused a mechanical issue, most often a failed Dead Shaft started to fail before your last Child was born, the inner cap bolts can often be found snapped off, it would be a fare guess to think the shaft has started to snap through so when was the oil level last checked on the shaft pivot, that is the 1/2" square drive plugs facing forward, don't be fast to blame other people for something that they probably had no hand in, by the way if it has the inner mount PAT Blade it rules out poor use of the blade, to pop off a Track Frame off an early D5 or D6 Hy-Drive would take me about 3 hours if the Beam pin was a pig, there looks a lack of oil in the pictures as the housing should be brim full.