M with engine serial # 228082 and higher, tractor serial # 238082 and higher (August 1950) used the same bolt pattern for mounting a IH pump like IH used on SM and others. Not all of those covers had enough clearance for the hour meter drive gear snout on the pump shaft, if equiped. Original IH cam gears have a number on them. Ones that end with D, worst. Ends with DA, better. Ends with DB, best. All original equipment gears had holes in them. If some aftermarket ones don't, that means you would have to install the gear on the cam after it was installed. D is thiner in the center than than other 2 gears. DA and DB look the same. DB has a center hole to give a tighter fit on the cam than DA does. Cams with left hand threads came out in 1957. They were sold as replacement parts for M camshafts and can be found in some M tractors along with any of the gears. Cam gear 6760 DB cam out in 1955. You can't depend on any model M tractor having a 6760 DA or DB cam gear.
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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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