I managed to get this one out with a lot of digging with the loader in soft wet soil. I wish I had a backhoe!
It usually takes about 1-2 hours to dig out a 12 inch pine stump with my
B7510, and having 4-5 feet of stump does not help much because the tractor is so light. I can grab the top of the stump and curl but it just drags the tractor, stabilizers buried and all, so I just have to dig down deep enough to tear most of the roots out before I try to break it loose. I tilt it a bit sideways with the stabilizers to be able to get under the stump once I get some clearance. I can then tear the roots with the teeth until I get it mostly free. Breaking what is left of the tap root is usually not much of a problem after that. A lot of the time is spent moving and getting back in position, but with limited reach, this is necessary. An even better way... (I wish I had pictures, but don't.)
I had a 17,000 pound Kobelco on the property recently doing something else and decided to get a few more stumps while I had it. I could usually get a stump by getting a full bucket of dirt out on each side, one in the back, and one in the front, then one more on the back side. I could then pull the stump toward the cab a couple of times, then go to the back again with the bucket as deep as I could get it. A couple of curls against the tap root would usually bring the whole thing out. I would usually push the dirt back in place with the bucket, then grab the stump on the way out. I have no idea how long it took but it was pretty fast. If I dug less, the stump would stand firm and I could drag the whole 17,000 pounds without popping the roots, so the B didn't feel quite so embarrassed after seeing that. I would guess that the Kobelco required less than 10 minutes total from drive up to drive away with stump, and that was working around other trees, which slowed things a little. Conclusion...pine stumps are tough to remove with the small stuff. Tim the Tool Man recommends at least an 80k pound excavator so one bite does the job....