Ok here goes, (1) check for any loose linkage , from the lever all the way to the Gov. And fix it (2) remove the Gov. cover and look where the spring hooks to the two arms , Does the spring just flop around in the arms?? . IF it does then the bushing are long gone as the spring is suppose to fit with vary little slop . (3) your spring may be getting weak or stretched You should have speed increase with in one notch of throttle movement . And full RPM's by the last notch . I went thru this on a friend's 400 and he is hard headed SOB as he did not believe me till i showen him the difference between his Gov . and my Gov. on my S/MTA even though mine is a M & W verse's his Stock one his bushings were gone and his would not ideal down or even come close to full throttle even with the throttle lever pulled down past the stop . I fixed it one afternoon for him and it made a new tractor out of it . So pull the sheet metal and the side cover back off and study every inch of the linkage and where the spring sets .
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Today's Featured Article - Tractor Profile: Farmall M - by Staff. H so that mountable implements were interchaneable. The Farmall M was most popular with large-acreage row-crop farmers. It was powered by either a high-compression gas engine or a distillate version with lower compression. Options included the Lift-All hydraulic system, a belt pulley, PTO, rubber tires, starter, lights and a swinging drawbar. It could be ordered in the high-crop, wide-front or tricycle configurations. The high-crop version was called a Model MV.
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