Looking back through PTSG's Pics
Not absolutely sure but, It appears that the op had no counterweight on the rear of the tractor. In this case that might be a good thing.
if the FEL is strong enough and the tractor op say, starts trying to pry out a 10 foot diameter boulder that only a bit is above ground with that long tine grapple and manages to get the rear tires off the ground it would have concentrated even more force on that front sub-frame, front axle and bearings.
It t took me a while to learn that when digging with most FELs once you release the bucket/lift valves to a neutral position, there really isn't any safety PRV in the system- other than bursting a hose, blowing a seal or something more expensive Giving. I was lucky and in a couple cases popped a hose and in the other the seals failed.
Like Hay Dude says, in addition once those ball bearings are free from the destroyed cage that used to keep them in the race, they are now free to roam and show those weak gear teeth just how much stronger 52100 chrome steel bearing material is.