Re: Ditch digger
Please tell me I understand the issue. If you push gravel with the FEL bucket and you hit a big rock, the tractor might stall or lose traction, but probably won't be damaged because the impact is 1) evenly distributed between the arms, and 2) in the direction for which the arms are designed to absorb impact. Likewise if your box scraper gets hung on a rock--the force is fairly evenly distributed between the the hitch points.
It sounds like the main concern is the twisting action that could result if the offset plow were to come to a sudden halt, because it would pivot, pulling on one point while pushing against the other. If that is the case, it sounds like the only solution would be to attach the plow boom to something more solid (e.g. the mid-body frame) or prevent the cause of the stress (e.g. a tension-release decoupler).
Is the 3-pt hitch that frail? I've seen pictures of box scrapers hoisted up to a 30 degree angle and being used to cut ditches, but the tractor had rear hydrolics and the hitch might have been category 2.
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