MechanicalGuy
Platinum Member
Trees grow perpendicular to the ground. A grapple, if your tractor is on all four wheels, is parallel to the ground. Grabbing an object that's [tall and] perpendicular to the grapple is tough.
I've gotten some pretty good sized trees (though mostly stumps) out with my B7800 and a tooth bar, but at a speed that's just slightly faster than my dog could dig out the stump/roots! I've determined that the loader on my B7800 is indestructible: I've had the tractor's rear wheels up off the ground and literally bouncing the tractor- yes, do NOT do this! (but, again, the B7800 won't break, I've given it everything I can throw at it) I've popped out a few stumps with my NX5510, just the loader and bucket, but given all the mass involved I'm a lot less eager to do this; I use its grapple to pick up stuff that's already down (and some really huge stuff at that).
Watch out if pushing over trees. I recently reminded myself to stop doing this as I had the top of one tree snap off and hit my cab top: I got lucky, the piece landed firmly on it's side, spreading out the impact over a large enough area that it didn't break anything. I DO, however, have a dent in my hood from debris flying out from my grapple. Industrial equipment is far more suited to such work!
I like to [try to] plan to combine similar work into a project. And when it comes to taking out trees and stumps (mostly stumps) I rent an excavator. The cost isn't really all that much. Not long ago I over-extended my loader's curl with the grapple on and I busted a curl cylinder. That was about $600, which is enough to cover the rental of a decent excavator for a good couple of days.
You gotta push them over and then put the bottom tines of the grapple under the roots.