.004 to .006" of circumfrential rotation (measured at the outer edge of the ring gear, tangent to the edge) will be a good guess. The gear (assuming it is either a spiral bevel, or straight cut bevel) will be fine if it has full length tooth contact, and a wipe pattern that is consistent along the tooth drive face. Pinion preload is another guess it should resist turning by hand, and stop when trying to spin it. It should not be so tight that you cannot turn it by hand on the pinion gear. Jim
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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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