Posted by Brendon-KS on July 16, 2016 at 06:42:04 from (63.245.191.109):
In Reply to: DOT?? posted by Geo-TH,In on July 16, 2016 at 05:16:55:
3/8 inch Gr 70 chain has a working load limit of 6600 lbs so per the regulations one at each corner of your 3000-4000 lbs tractor provides a large overkill in strength. Even a 1/4 Gr 70 chain (3150 lbs WWL) at each corner would be in compliance for securing a tractor this size.
As you state, the regulations are based on braking, accelerating, and lateral loads since those are the only ones that are realistic and predictable. There's simply no way to predict the forces that could be applied in a collision scenario so there's no point in mandating to some completely arbitrary number. A Gr 70 chain's breaking strength is 4 times the working load limit so you already have a large safety factor working for you to cover unforeseen circumstances.
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Today's Featured Article - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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