Posted by Janicholson on February 07, 2010 at 11:02:14 from (64.61.211.33):
In Reply to: governor mystery? posted by mike paulson on February 07, 2010 at 10:40:38:
Governors, like the one on your tractor, control the engines speed. The common speed control on a gasoline engine is the throttle plate. A shaft linkage is connected to the throttle shaft where that tube connects (a tricky connection to get correct as well, if taken apart) coming from the governor. The governor is similar to a rock on a string. When whirled around over head, the faster the whirling, the stronger the pull on the string. This is speed sensing, and (metaphorically) the string is connected to the throttle plate, and a spring. To make the engine run faster, the spring holds the throttle open more. increasing the RPM of the "rock". When the rock pulls hard enough to close the throttle some, it levels out the RPM. Your speed control on the steering column of the tractor, pulls on the spring when it is moved downward, and releases pressure when idled down. When it is used in the field, working the tractor, the throttle plate is adjusted to keep the engine speed constant (within a narrow range) as loads increase. As the load gets tougher, the engine speed slows down a little. THis allows the "Rock" to come closer in as the spring pulls it. This opens the throttle and gives more power. When the throttle is fully open, and the speed continues to fall, the engine will be putting out max HP. At some point the engine will have less power than needed to continue running at a reasonable RPM, and shifting down will be needed. The governor then takes over again. Max RPM is determined by spring design, and loading of the spring. Idle is set by a stop in the carb that keeps the throttle plate open at a tiny crack. I hope this worked. Jim
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