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sw corner ia. | I still run a 1980 model 643, about ten years ago I threw away the old cast rolls and replaced them with clarke machine knife roll conversions using oem caseih knives. I run the outside gears at 1 to 1 and run the head almost but not quite as slow as I the variable will let it go (9500 jd) I usually run about 4mph in pretty heavy corn and usually under 15%. these rolls work very well and running them slow seems to keep from shelling at the head but the knives will still pull everything through. I also replaced all the worn out snoots with clarke flip up plastic ones. makes it really easy to service everything when you can get the whole snout up and out of the way.
Love this old head, it still has the original bearings in the gearboxes. | |
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Tips to get a 643 head to do better
