Posted by LenNH on January 24, 2008 at 09:36:08 from (75.69.99.42):
In Reply to: 10 20? posted by Milo Holroyd on January 17, 2008 at 15:18:28:
Another note on the governor control. On the tractor, there is a quadrant attached to the steering column just below where the steering shaft enters the casting. On the front of the quadrant is the spark control, and on the back, closer to the driver is the governor control. All the way to the left, at 9 o'clock is slow (and off for the mag), and all the way up at 12 o'clock is fast (and full advance for the mag). The linkage is two tubes. The outside tube stops above the mag, and has attached to it a short lever, which is connected to the mag (E-4A or others similar) by a heavy rod, bent to the proper shape, with L's on the end where the rod is attached at each end. Obviously, this later mag doesn't have any connection to a retard/off lever. The governor control on the tractor is a rod INSIDE the tube. This rod went to the front of the engine, where there was a bracket with a small bushing for the rod to turn in. At the front of this rod was a small lever, and from THIS, a rod, similar to the mag lever, but shaped to fit this area, went across to the governor control, which is ANOTHER lever that goes into the tube leading back to the carb. Sounds incredibly complex, but it's easy to understand, esp. if you see it once. F-20 and F-30 are similar, but the rods go over the top of the hood instead of down inside the engine compartment. I have good photos of this setup in a very old IH repair book for the 10-20 and 15-30. I will gladly scan and send these to you via e-mail if you just drop me a note at the e-mail link. I "lived" on a 10-20 and an F-20 in my misspent youth, and they are still very much alive in my mind even if I haven't used one of them in over 50 years. Amazing what trivia you can remember. Now where did I put my car keys?
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