The gears are put on HOT, and then when they cool they lock into position. A good puller usually can pull them off, but you may have to heat them with a torch if they are stubborn. don"t heat the shaft, just the gears.
Depending on its age, it might be a 2 piece gear, or a single gear. I"d use a bearing puller or something behind the gears so your puller jaws aren"t pulling on the gear teeth (they break).
IF you go here, you will find gravely manuals that will show you how to do all this stuff.
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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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