Cross posted with you and Sue, sorry. The tractor treatment to level the soil may have added insult to injury on the roots on that side of the tree.
You also need to STOP watering. If you've (probably) got broken and torn roots under the soil there, keeping them wet isn't going to help the tree. It's not taking in water much right now, again shown by the die-off of the leaves. Let the area dry out, then unless it doesn't rain for a week or so, don't water again. Once you see new green leaves starting to show up, then watering the area in a 40ft. circle around the tree with a sprinkler might be a good idea if we have a dry spell in the fall.
