The thing that gets my attention here is that the carriage bolt is marked 307, which is an ASTM designation and I believe the equivalent of grade 5, regardless, the manufacturer has marked these as such and they should meet the criteria for same, obviously not the case in tension here is it ? Could be the same for shear, appears to be defective or substandard material. This creates an unsafe connection, one that may fail and cause someone injury. I do not believe a grade 5 fastener should fail like it did, unless it was over torqued. In comparison, structural steel connections are made with A325 fasteners, high strength bolts, which I believe are the equivalent to grade 8, regardless, they are marked as such, you cannot have substandard materials for these kinds of connections, it would be catastrophic. Funny, while on high rise jobs I used to pick up a lot of those A325's and put em in my bin at home, same ones fit and hold my tractor wheels on, ironworkers used to drop buckets of em on jobs, never stop to pick em up, I used to find a lot of useful hardware on jobsites such as these.
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Today's Featured Article - Tuning-Up Your Tractor: Plugs & Compression Testing - by Curtis Von Fange. The engine seems to run rough. In the exhaust you can hear an occasion 'poofing' sound like somethings not firing on all cylinders. Under loaded conditions the tractor seems to lack power and it belches black smoke out of the exhaust. For some reason it just doesn't want to start up without cranking and cranking the starter. All these conditions can be signals that your unit is in need of a tune up. Ok, so what is involved in a tune up? You say, swap plugs and file the points....now tha
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