I can break the grade 3 bolts just on hitting 5 or 6 fireant mounds in august. So I suspect your using harden black or even harder gold bolts if they are not breaking. When we shred mesquite pastures we start out with a minimum of a bag of 10 each 1/2 bolts, 2 3/4 long with lock washers and nuts with two crescent wrenches on each tractor. Depending on the sign of the moon, almanac and stars, we may break 1 bolt in 6 days or 15 bolts in one day. We have moved up to black bolts with 3 marks and have satisfactory results as they will allow about 10 fire ant mounts or gopher mounds to go through, and still break on the bigger stumps. However by moving up to the 250 hp gear boxes with 8 inch pto clutches... means now we break a blade or two each year and twist the pto shafts pretty badly each year. The Hardy 7 foot right of way shredders are pretty hard to beat, but you have to add about 300lb to the front of the 6640 to keep the front wheels on the ground.
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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