As Randy said, bolt patterns are the same and H and M pulleys are interchangeable. There are many different sizes of pulleys, depending on how fast you want the belt to run. The larger the pulley, the faster the belt speed. Also, I believe the H belt pulley turns faster than the M and therefore the H came with a smaller standard belt pulley than the M. So if you are going to run something with the belt, then you need to size the tractor pulley according to required RPM of the implement and the implement belt pulley size. If you are not going to use the pulley, then just put on the size that you think looks best.
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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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