Seems jerking the chain this way would be similar (although opposite direction) shock stress as just driving your tractor into a brick wall.
Sorry, but I would say that is bigtime abuse of your tractor, and a good way to end up 'eating' the chain when it breaks loose from the stump. I think there is a casting over the axle that may break doing this, but hopefully not yet.
Jerking anything to get it to move is hard on the machinery.
Not the way I would do it. I'd get enough roots loose or severed to attach the chain and pull from the drawbar. That is where the tractor is designed to pull from, and if the stump is going to come out, it will. I would tighten against the chain and then in a low gear, let the clutch out and pull. IF the stump is loose enough, it will come out. If not, the tractor tires will spin. No abuse however doing it this way.
Sorry, don't mean to preach or lecture to you here, but thinking maybe others will read and learn how best to treat their equipment.
I have things to learn from this forum too. /forums/images/graemlins/wink.gif
I hope the spring is all that is wrong with the clutch.