Dalet: The raddle chain does the same thing as the shoe augers on your JD 4400. The raddle carries the grain/trash up from under the cylinder. The straw walkers have a pan made in the bottom of them to shake the grain forward. If you go down a steep hill the raddle chain will plug and if you shell up a steep hill the straw walker pans can get full and walk all the grain out the back.
The augers where a big improvement over the raddle chain. I think this one thing really jumped JD ahead in the combine market around here.
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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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