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Demo hammers are usually pin mounted. To my knowledge there are no pin mounted thumb kits. There are kits that have large U-bolts that clamp to the stick but I don't know anything about them. You will also need a return line to your valve so you can operate a double acting cylinder, with a pressure relief valve on it.
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This is the type valve you want if want to add a hydraulic thumb and you don't have a power beyond port. I used this type valve in my excavator dozer blade circuit. For instance, you could, say, install this valve in your right side stabilizer circuit. Then when you wanted to use the thumb just flip the toggle switch and use the right side stabilizer control valve to operate the thumb. Be sure to install a pressure relief valve in the return line set to about 1,750 psig to avoid damage to the thumb, and possibly shearing pins.
http://www.princessauto.com/pa…../8051799.p
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well I picked up the thumb looks like the construction of it was pretty good .When I placed the thumb on the stick I saw it was not made for this stick(the sale said it was generic) but all I need is a piece of steel 3/4 thick tapered from 4- 3/4 inches to 6 – 1/2 inches by 42 inches long to flatten out the bottom of the stick and add one grease fitting on the thumb,the deal was too good to be to easy.oh well open another beer!
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well got it all put together and man that is nice not having to try to curl logs against the boom to pick them up.took pictures of each step to post them ,but my camera that works with my old xp computer will not load the disc on this 8.1 computer,so until I figure it out you will have to take my word on it.sorry
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