The early W-30, as in 10-20, 15-30, Farmalls Regular, F-20 and F-30 had a fixed speed governor, the 10-20 at 1000 rpm, the W-30 at 1200 rpm. The driver had NO control over engine speed. the other level on the same shaft was for the throttle limit. By this you could limit the amount that the governor was able to open the carburetor butterfly valve. As the 10-20 manual p[oints out if you limiut the opening you may have little power available. It was used to slow the tractor down, not buy changing the governor spring tension (balancing the centrifugal force) but by limiting the ability of the governor to let more fuel balance the increase in load. In later 1937 IHC modified the above mentioned tractors to allow a variable speed governor. The 12 series tractors had variable speed governors from the beginning as did the W-40 and WD-40. There was a method of externally adjusting governor speed on the earlier tractors but not from the driver's seat, you could adjust the spring tension but this was for getting the speed right for belt driven machines. The two tanks were for kerosene as the main fuel and gasoline for starting until the engine was hot enough to burn kerosene. These tractors also had radiator curtains to help keep the cooling water hot enough for burning kerosene (about 200 degrees F) and also manifold where the intake fuel/air was heated before reaching the cylinders to stop the kerosene from condensing on the cylinder walls. As it was, the sump oil had to be changed about twice as often as in gasoline tractors and the top pint of oil was drained from the sump each morning (contaminated with kerosene) and the oil then topped up. The carburetors had a drain so the the bowl could be drained if you unfortunately stopped the engine whilst burning kerosene. You had to start on gasoline as the kerosene would not burn unless the engine was HOT. When the new Farmalls came out in 1939 the standard fuel was kerosene or distillate which had come onto the market just beforehand as a cheaper fuel than kerosene (except for Farmalls A and B). The gasoline high compression version for the M and H appeared about 1940. All IHC tractors from about 1905 to 1939 were designed to run on kerosene (Mogul, Titan, 10-20, 15-30 etc).
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Today's Featured Article - A Belt Pulley? Really Doing Something? - by Chris Pratt. Belt Pulleys! Most of us conjure up a picture of a massive thresher with a wide belt lazily arching to a tractor 35 feet away throwing a cloud of dust, straw and grain, and while nostalgic, not too practical a method of using our tractors. While this may have been the bread and butter of the belt work in the past (since this is what made the money on many farms), the smaller tasks may have been and still can be its real claim to fame. The thresher would bring in the harvest (and income) once a y
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