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70D: Actually, I think the precleaner might have been selected as an option most by operators who were working in extremely dusty conditions. Someone else might be able to help here, but I would have thought that standard tractors might have used them more than row crops since they tended to have a dustier environment, and probably would not have minded the hood being filled with upright stacks. We had one on our 4020D, and it did help grab extra dirt prior to the aircleaner. We did not have one our '70', but did run a picker (227) on it. Corn picking looks pretty dirty, but it's lots of leaves, and husks, and chunks of smut, and that stuff is pretty big. Working dry ground is where you really need that precleaner. When the numbered series came out with the fine screen grilles, it removed a lot need to prescreen the radiator for picking. I imagine it helped filter out the larger bits that the old vertical air stacks used to let through. Frank
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