Bought a CaseIH 1640 last year. Had the same experience with wheat straw last year and at the beginning of harvest this year - almost as if I had a chopper (which the machine does not) - but a few days ago I decided to open the concave from a "1" (for hard to thresh crops) to a 2.5 (regular grain). Huge difference. Straw is not chewed up, full length with heads attached. Fully threshed. Going 3 mph in 70 bpa wheat w/16.5' header. Uses less power & fuel and increases capacity. Hit 3.8 mph yesterday trying to finish a field ahead of a storm. Bottom line, it's all about adjusting the machine correctly to match crop conditions. You can make nice straw behind a rotary. My neighbor put up several thousand bales behind me last week and the bales (late model JD baler) were as perfect as one could hope for.
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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