Please see the 2.0 video linked at the end of this video. [ Ссылка ]
This video shows construction of my brush grubber; [ Ссылка ]
I modified the assembly so the chain does not need to be run through the pipe for each pull.
Please subscribe if you enjoyed this video.
The thumbnail picture is of my updated Brush Grubber, described in part 2.
I thought I had an excellent, original idea until I found this story while googling DIY Brush Grubber to see if my video showed up; [ Ссылка ]
Based on my on-line findings, the shear force of a grade 2, 3/8" bolt is 4,900 pounds, grade 5 is 7,900 and grade 8 is 9,300 pounds. The brusher grubber I am using is he one demonstrated in the 2.0 video. It is constructed with 2, grade 2, 3/8" bolts so it should require a force of 9,800 pounds before the bolts would fail. I've been using the puller for a couple of years and plan to replace the bolts with grade 5 bolts before I start clearing trails this spring. Part of the reason my original grabber had the hook on the pipe with a bolt chaser is because I was concerned the bolt would not be able to handle the force. My tractor weighs 3.000 pounds so on a straight pull without anything to increase the mechanical advantage, the tractor will start spinning and digging down before the bolts potential to fail comes into the equation.
