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 - Product Review: Black Tire Paint - by Staff. I have been fortunate in that two of my tractors have had rear tires that were in great shape when I bought the tractor. My model "H" even had the old style fronts with plenty of tread. My "L" fronts were mismatched Sears Guardsman snow tires, which I promptly tossed. Well, although these tires were in good shape as far as tread was concerned, they looked real sad. All were flat, but new tubes fixed that. In addition to years and years of scuffing and fading, they had paint splattered on
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