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Southern MN | Bought one new back in about 1997 to pull behind our 230hp 4wd and were generally happy with it. It was a huge improvement over the International 55 chisel it replaced due to it's improved trash flow and increased weight. It, however, pulled HARD. We ran ours with 4" twist shovels and it was all that 4386 wanted. A few things about them; the coulters don't do much other than stabilize the machine and keep it from rocking side to side and you definitely want to make sure it is equipped with the shank extenders (3 on the 11 shank model) on the rear. We always chopped our stalks and in the spring was able to get by with two-passes with the field cultivator prior to planting. On a couple occasions when the stalks were not chopped it tended to drag, then plug with long stalks near the wheel assemblies. The trip mechanisism worked fine for us when encountering large obstructions, but I do remember replacing a fair number of shear bolts.
Hope this helps.
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Case IH 6650 disk chisel?
