THIS is how you pull stumps!!!!

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isaaccarlson

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http://www.youtube.com/watch?v=jAsyQtm1-Cc
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I dont have the shear but I think I can pop stumps just as fast with my excavator with thumb but he gets less dirt and can split them up nicer
 
Near the end of the video it said "over 70 tons of cutting force." What p.s.i do the hydraulics operate at on one of those machines? A 6 inch cylinder at 3500 psi would yield ~50 tons (if my math is correct...).
 
Near the end of the video it said "over 70 tons of cutting force." What p.s.i do the hydraulics operate at on one of those machines? A 6 inch cylinder at 3500 psi would yield ~50 tons (if my math is correct...).

Not sure of operational pressure, but you must also take into consideration "leverage". A piston capable of 50 tons pressure could have a 2:1 leverage (think "Off Center teeter-totter") and be capable of 100 tons.
 
Near the end of the video it said "over 70 tons of cutting force." What p.s.i do the hydraulics operate at on one of those machines? A 6 inch cylinder at 3500 psi would yield ~50 tons (if my math is correct...).

Depends alot on the modle of the machine I know alot of the bigger Deere excavators were 4500-5500PSI depending on where we set them and what modle they were. The mechanincal advantage built in undoutably plays a part in the 70 tons of force too.

Definatly a interesting attacment, I guess I'd have to run one for a while to give an honest opinion but I think a bucket with a thumb would do about the same job (minus the sheering action) and be a little more versitle with out the down time to swap back over to a bucket. That sheer definatly has its place though, if ya had alot of stumps to pop and cut up before digging that would probably be the cats :censored:
 
I think it sucks. A normal bucket with thumb could get more done faster. Something was slow on that bucket too, maybe just hydro flow or maybe the operator. Other than splitting a couple of rounds, which is a waste of time on a machine that big, what's the advantage to this very expensive looking attachment?
 
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