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Tractor Talk Discussion Forum

Generator governor

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meanmtn

02-16-2008 14:52:10




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What exactly makes a governor work?I have a small generator that runs great after cleaning the tank and carb. But, when you plug something into it the engine does not rev back up to adjust the voltage properly. did i put something back together wrong or is the governor not working?




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KEB1

02-17-2008 08:26:51




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 Re: Generator governor in reply to meanmtn, 02-16-2008 14:52:10  
Did you get the linkage from the governor to the throttle hooked up properly after you cleaned the carb? One possibility is that something is binding in either the linkage or the throttle mechanism and the governor can't open the throttle far enough to carry any load.

Is there a high-speed mixture screw on the carburetor? If that's not set properly, the engine can get enough fuel to run great with no load, but not enough fuel to keep the engine speed up under load.

Check for proper throttle movement. With the engine off, the governor should be holding the throttle all the way open. Once the engine starts, the throttle should close most of the way, just open enough to keep the engine turning at the proper speed. When you apply a load, the throttle should open progressively as the load increases.

Put a heavy load on the generator that won't be damaged by variations in voltage and frequency, such as an electric heater. With the generator loaded, can you manually push the throttle open enough to bring the engine speed (and generator output voltage) back up to where its supposed to be? If you can, sounds like a governor problem. If you can't, then its likely a carburetor adjustment or fuel delivery problem.

Keith

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Bob

02-16-2008 20:55:02




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 Re: Generator governor in reply to meanmtn, 02-16-2008 14:52:10  
NO generator engine will have an "air vane governor".

It sounds like there is a lack of fuel flow to your engine.



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Janicholson

02-16-2008 17:47:43




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 Re: Generator governor in reply to meanmtn, 02-16-2008 14:52:10  
Dave's response is about all there is.
Small engines with air cooling have either an internal flyweight governor or an air vane governor.
The carb will have a throttle that controls speed. Attached to this is a rod that connects to a spring and lever assembly. Some of these levers are connected to a rod going into the crankcase. Others go to the air cooling shroud and an air vane in the inside of the sheet metal. In either case, the rod and throttle should move (with it shut off) from idle to full throttle. If it is stuck, and very modest force (fingers) won't move it, it needs to be taken apart to get it operational. Un-governed engines can become self disassembling broken components. There are many websites dedicated to specific engines, put a google on it. JimN

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dave guest

02-16-2008 16:57:39




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 Re: Generator governor in reply to meanmtn, 02-16-2008 14:52:10  
Purty sure some of the old engines used an air flap sorta thing that was moved by air according to speed of flywheel. That and a spring was it. You may have something newer. I would not know about it.



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