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On the later model 620's, the final drive sprocket has 35 teeth and the driver, 13. The driven pulley is about twice the diamter of the mule drive (rough estimate without measuring). On that basis, you have a reduction of about 5.4:1, which would give an auger speed of about 560 rpm at an engine speed of 3000 rpm. Roughly 10 revs per sec.
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