THIS is how you pull stumps!!!!

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isaaccarlson

isaaccarlson

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http://www.youtube.com/watch?v=jAsyQtm1-Cc
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woodman6666

woodman6666

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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
 
rmihalek

rmihalek

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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...).
 

jags

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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.
 
Farmall Guy

Farmall Guy

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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:
 
Highbeam

Highbeam

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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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