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I just added one of andy tatro's grapples to My montana 3644 and used the the existing rear hydraulic connections with hydraulic hoses under the tractor to the front. Worked great and you don't have to fool with tapping the hydraulics as the extra remotes are already there. Also the lever to operate the
grapple is built in to the tractor platform so it is very natural to use. I put one on about two weeks ago and the things just work great for moving downed trees. You don't have to cut much up as you can grab a whole tree and move it ( if its a relatively small tree <10" in diameter).
Just be aware that if you use the bolt on style, that the top of the bucket isn't heavy enough to take the
grapple and you will need some reinforcement. I welded a 2.5X2.5x1/4 tube on the top of my entire bucket and mounted the
grapple to it. Works great.