I just went back thru your thread on your project for a second time. There's a lot of reading there, but this time on concentrated on just your build thread. Do you have an engineering background or degree? It's really an impressive tractor. The use of the hydro motors really has me interested in converting my dozer to that propulsion, that would eliminate a lot of problems. Maybe in the future.
I would add two bolt each end of the attachment brackets and one each side of each attachment point. Those straps may stretch under the pressure that's put on the bucket. Reinforce plates inside at the bolts would be a good idea. If the brackets had been welded to the bucket whey would have provided a lot of reinforcement to the bucket. The bucket looks great, :fing32: don't want to see all that work go out the back door.
You have it rolling rolling rolling! :fing32: What I thought broke the key was impact loading. May have been when the love-joy joint destroyed. Was the key in the pump or some where else on the attachment.