Re: 4\" Stump Removal
My comments probably don't help much in this case, but many times others read these threads & might be helped, esp those new to tractors. So:
You either need a bigger tractor (I would pull these with a good chain, 2 wraps around the stump, & the 135hp tractor I have) or you need much longer stumps. And with a light 2-wheel drive tractor, you still might be chopping a lot of roots from the back side to pull them out. And, do not hook onto any point higher than the drawbar. I know that top link is inviting, and will give more traction, but the geomotry is really bad on that - it will flip the tractor right over backwards on top of you much, much quicker than you realize!
I don't see where the back blade will be of much help. On some species of tree a ripper or chisel point will rip out some shallow roots & help a lot, but oaks have a pretty good, deep, tap root.
If you ever pull on a tall tree, look up, and get a LONG chain or cable. And be aware of what happens when a cable snaps.
My granduncle was pulling a little rotten branch off of a mature tree. When he pulled with the short chain, the whole tree fell over as it was also rotten (not visable) and knocked him off the tractor - threw him under the wheel. This was in the days of steel wheels.
--->Paul