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depending on the age and the way the machine has been treated, the axles can be miserable to remove. my sprocket tubes were bound to the axles from years of corrosion. i cut the axles out, then put them in a press. they poped out of the sprocket tubes at 4-6000 psi. needless to say, a slide hammer wasn't gonna do it.
if the machine is running you can remove the bolts that go through the axle/ sprocket tube and take the machine for a drive... that might break them loose. other than that, it's just a matter of loosening the setscrews on the inner bearings, and the set screw on the ecentric collar on the outer. then with a hammer and punch, try to spin the ecentric collar on the axle. if it wont go one way try the other. once all that's done, they should slide out.
good luck
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"momentum is your friend"
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