M&W made a retrofit pump to fit H and M Farmalls. (made before 1950.5) The 1950 and a half and later tractors have the same bolt pattern and better cam gears found on super H and M tractors. Earlier tractors have a different bolt pattern. The weak cam gears do fail when used with a pump. The M pumps from super Ms SMTA, 400, 450, all will work with the later M tractors. The SH 300 350 live pump wil fit the later H. The replacement of the cam drive gear and front cover casting (or plugging and redrilling mounting holes for the same old cover is needed to use a live IH OEM style pump on an older H or M. M&W pumps are no longer made and command a good price if good. Jim
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