Posted by Jeff Wenner on April 30, 2014 at 16:32:27 from (50.201.128.40):
In Reply to: F-20 question posted by Curt W. on April 30, 2014 at 08:43:01:
I'm guessing what your calling the square one is the older one for the single speed governor. The one with the arm is the later for the variable speed governor(or maybe a field change update). On the earlier IH tractors of this timeframe, the governor only worked when you had the engine revved up and working around it's rated rpms. The later ones (became std equipment around 1937 I think) governed the engine speed to maintain whatever RPM you wanted depending on where you had the "throttle" set. If you are going for originality on your tractor, get a parts book and figure out what would have come on it from the factory. If you're going to be using the tractor and you have or can get all the parts that go with it, use the one with the arm.
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