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49 G Governor

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Clay

06-20-2002 18:22:22




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I am only 14 and own a john deere g , which is currently under restoration. I am wondering how the governor actually works. I know that it controls the mag and isnt it connected to the carb




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Gman

06-20-2002 19:02:32




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 Re: 49 G Governor in reply to Clay, 06-20-2002 18:22:22  
Hi Clay glad to see some young people in this tractor world. Clay now to your question ay the top of Gov. housing you got a rod protruding thru case with an spring arm attached to it,one goes to hand throttle and the other goes to carb.When you get to the point of starting tractor or final assembly pay particular attention to the rod going to carb,it should be adjusted a halve a holes width (I think in full throttle position).If you have a I-T Manuel it will clarify this. Keep up the good work if I can be of assistance email me. Gman

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Clooney

06-20-2002 19:02:02




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 Re: 49 G Governor in reply to Clay, 06-20-2002 18:22:22  
Clay, the governor on a Deere 2-cylinder only controls the carb & not the mag.
~Basically the governor is a set of pivoting weights that expand or contract based on the centrifugal force due to the speed they rotate at. ~On each weight is a lever that pushes on a spool & that spool moves due to the weights pushing on it due to RPM, riding on that spool is a fork hooked to a shaft & that shaft is hooked to a lever with a spring on it that attaches through a rod to the hand throttle lever, the lever itself is hooked to the carb with another rod. ~When the hand throttle lever is moved to the desired speed, it puts pressure on the governor lever spring, as soon as that spring is put under tension it tries to move the governor lever & open the carb throttle plate to wide open. As the engine starts to accelerate the weights in the governor move outward due to centrifugal force caused by their faster rotation & try to close the throttle to slow the engine down. ~The engine RPM remains pretty constant even under load due to the balancing of the governor weight force against the governor spring force. As the engine starts to slow down due to added load, the governor lever spring adds throttle plate opening to try to speed the engine up, as the engine speeds up due to less load, the governor weights swing out & close the carb throttle plate to slow the engine down.
~If everything works as intended the engine will remain at a constant speed regardless of load.
~So when you move the throttle lever to add RPM you are actually just increasing the spring pressure on the governor lever & the weights in the governor try to keep it where you set it..... ....

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Clay

06-20-2002 19:06:06




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 Re: Re: 49 G Governor in reply to Clooney, 06-20-2002 19:02:02  
Thanks Clooney that really helps. By the way I ordered a gasket set from jd for the governor, but do you know where to find a rebuild kit?



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