The 10-20 engine was governed to run at 1000 rpm. The throttle lever limited the movement of the carburetor butterfly, i.e if the governor tried to open up for more fuel to match increased load it could not. This is why the manual warns that if the throttle is closed there is little power available. The early tractors did have a governor adjustment on the rear side of the governor housing but this was for minor adjustments when say running belt driven machines (i.e. it was not adjustable from the seat). The very early 15-30 did not even have this adjustment, it came a bit later. As far as I know, the first IH tractors (post Titan 10-20) to have adjustable governors (i.e. where one can change the spring tension to adjust desired rpm from the seat) was probably the 1932 F-12 and the later 12 series tractors. The 1934 W-40 and WD-40 also had adjustable governors, the other tractors, 10-20, W-30 F-20 and F-30 did not get adjustable governors until about 1937. I believe there was an upgrade kit to make the changes on older tractors.
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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