Posted by D Slater on February 16, 2018 at 17:31:05 from (184.13.46.65):
In Reply to: Super M? M? posted by johnlobb on February 16, 2018 at 13:11:29:
M tractors were built from 1939 into early 1952. SM tractors assembled at Farmall works were built from early 52 until early 54. Louisville SM tractors were assembled at Louisville KY. from in May 1952 to into July 53. If you take the last M tractor and the first built SM tractor and sit beside each other missing the emblem and lettering, and not close enough to see numbers you couldn't tell them apart. Late M tractors got some SM upgrades before the supers. Most stuff already posted about M tractors applies though, like band used on 99% of M verses disc brakes. Around 7 horsepower more on SM for gasoline engine tractors when first built. In March of 53 the chassis was changed on both models of SM for accepting a engine driven hydraulic pump. Countershaft driven hydraulic pump like used on a M and SM was still available for SM tractors built after the chassis change if the engine driven pump was dropped. Most noticed chassis change was battery box moved to under seat, for non diesel models a clutch housing for 3 bolt starter mounting instead of two. Other changes like controls and gear shifter to chassis also. Transmissions on SM had faster 2nd through 4th speed gears. Both M and SM had a lower speed first gear option. M only had a faster 4th gear option. Bigger bearings were used in certain places on real late M and SM in transmission housing and for engine crankshaft. Crankshaft diameters were actually bigger and bearings less thick. SM engine block can use 1/8 bigger cylinder bore than a M block. SM and real late M used a 12 inch clutch and flywheel with pilot bearing that didn't require grease at lube time. No live or IPTO on a M or regular SM. Think the SM was the first Farmall that could be equipped with 13X38 tires when assembled. Other sizes were installed. Other than a bigger engine bore slight changes in cylinder head, manifold, carburetor and aluminum pistons used on most SM tractors resulted in more power. Manifold and head were also added to real late M. Early in production SM got thicker drawbars. Late M and SM got a lower bolster with less caster and thicker flanges on the loop type front cast wheels. Several other changes but getting to long with this.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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