Don't have the info at hand, but may "somewhere" in some of my old IHC brochures. Belt-driven machines required a certain "belt speed" (feet-per-minute) to run properly, not overspeed, etc. I know it was possible to get different sized pulleys for the machines (threshers, ensilage choppers/blowers, etc.). I do happen to have an H/M brochure handy. The pulley listed for the M is 11 X 7-1/2". The belt speed is 2588 feet-per-minute at 899 rpm (1450 engine rpm). There is no mention of other pulley sizes, but it may have been possible to get another size by special order.
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