IH sold several size pulleys for M tractors depending what was being run from the belt. Belt drives and pulleys were considered a attachment, so I don't yhink any one size was considered standard. Common was the 11 x 7.5 and a 12 x 8.5 and 13 x 8.5 were sold. The only advantage with iron was holding up better if left out in the weather. Fiber, paper pulleys griped belts better. IH was getting fiber pulleys for M size tractors until in 1951 or 52 when something happened to the supply. Think the company went out of buisness or quit making pulleys. IH then went to selling the iron ones for the next few years. Don't know if IH considered the iron ones less effective or they cost more, but for some reason IH considered the iron ones to be sold for emergency use on H, M size tractors when fiber pulleys were not available.
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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