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Zinan 
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Joined: 22 Jan 2020
Location: tn
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 Topic: CA Throttle linkage
Posted: 17 Nov 2020 at 12:45pm |
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I accidentally bumped the throttle linkage on my dads CA, its an aftermarket zenith carb, im scarred to start the tractor, in the first throttle notch it holds the lever on the carb at idle, second notch moves it forward about 1/8th inch, third notch the throttle lever on the carb is free to move idle to full throttle, anyone know how I can fix this, would like it to be fixed before my dad gets back from work (Either tomorrow night, or about a week from now, we dont know), where the throttle lever connects on the right side of the engine (Next to distributor) its a little loose, but its been that way for the 4 years we have had the tractor, any ideas? ive already tightened up the linkage on the throttle, so it holds everything in idle at the first throttle notch, still loose tho, and I dont want to mess with a tractor I cant start to test just yet, and I dont know all what is the adjustments for this one anyways
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Zinan
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Posted: 17 Nov 2020 at 12:46pm |
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also, when I bumped the throttle lever on the carb, it made a pop, then went loose as if something broke, but I looked nothing broke, shouldnt be anything inside the carb, as it wouldnt have had anything to bind on and snap.
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MACK
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Posted: 17 Nov 2020 at 9:13pm |
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Start it up. If it over reves, you can shut it off. Sounds like it in normal. MACK
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Zinan
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Posted: 18 Nov 2020 at 7:32am |
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when I move the throttle control to the 3rd position, the lever on the carb is free to move from idle to wot, above the 3rd notch, it goes wot, Maybe it has something to do with the governor not being driven from the engine? might also need oil pressure, but ill see if I can check
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Luke114
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Posted: 18 Nov 2020 at 9:29am |
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The governor more or less defaults to WOT by spring pressure until rpm's and spinning weights counteract the forces of the spring. The throttle is adding more spring pressure that the weights have to overcome. What you are describing sounds pretty normal with the engine OFF, unless I don't understand the question.
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Zinan
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Posted: 18 Nov 2020 at 10:27am |
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idle on the controll holds carb at idle, fifth notch of throttle holds it at wot, in between the carb can do whatever it wants, ill fire it up and see if the governor spinning does anything, hope its fixed by the time dads home in a few hours lol
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Dick L
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Location: Edon Ohio
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Posted: 18 Nov 2020 at 11:34am |
Would this picture help?
Edited by Dick L - 18 Nov 2020 at 11:38am
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Zinan
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Posted: 18 Nov 2020 at 11:37am |
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I can see better than the one ive got parked in my shed rn lol
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Zinan
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Posted: 18 Nov 2020 at 11:54am |
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I can move the link at the carb (2nd pic) without it trying to move the throttle lever, if thats normal, I think itll be fine, but I dont know if its normal
Edited by Zinan - 18 Nov 2020 at 11:55am
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Dick L
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Posted: 18 Nov 2020 at 4:26pm |
That is normal!
See the spring in the first picture. That is where the movement from the other side stops without moving the throttle by the steering wheel.
Edited by Dick L - 18 Nov 2020 at 4:30pm
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Zinan
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Posted: 18 Nov 2020 at 6:32pm |
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oh ok, so about half throttle? on ours right now (Without starting it) half throttle on the handle is holding the carb at wot, but I guess its just because the governor isnt functioning at the moment?
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Zinan
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Posted: 19 Nov 2020 at 8:42am |
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hope its fine, because I might need it soon, we cut a tree down for milling, and now ive got a massive brush pile to deal with, about a 130ft poplar, id say about 36 inches at the stump, made a nice thud
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Luke114
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Posted: 19 Nov 2020 at 10:53am |
Another way to think about it that might make sense...the throttle lever sets a desired engine speed at the governor, not the carburetor. If the engine speed is lower than the set point of the hand lever, the governor opens the throttle butterfly in the carb. If the engine speed is too fast, it closes it.
With the engine off, the actual speed (zero) is slower than the set point, so the governor is opening the throttle to try to increase speed. It doesn't know the engine is off, it's just trying to get more fuel/air to it. When you move the hand throttle, there is no direct connection to the carburetor (like a car accelerator pedal) other than through springs and weights, so it might feel confusing.
Just start it up.
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Zinan
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Posted: 19 Nov 2020 at 11:14am |
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oh ok, thanks, I had a rough idea of the way it works, but im not used to this exact setup, just lawnmowers and cars, so this is still new to me lol
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Ken in Texas
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Posted: 20 Nov 2020 at 5:35am |
The third photo Dick L posted shows a rusty washer and a cotter pin holding this joint together. . Taken loose with the throtle control wide open and the rod to the carb full open the rod to the carb should be 1/16 inch short of going in the hole in the arm coming across the front of the engine. Adjust for the 1/16 inch by BENDING the arm more or less to give you the correct 1/16th . This 1/16 inch is critical for the throttle lever to have the full RPM range from idle to wide open. Don't ask me why setting the linkage adjustment by bending the arm works. The anti surge spring must be of the correct strength and length to go from the hole in the rod to the carb and a manifold bolt also. I'm no good at posting pics. Maybe Dick L can post pics of the spring and what a 1/16 inch short looks like.
Edited by Ken in Texas - 20 Nov 2020 at 5:45am
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Dick L
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Posted: 20 Nov 2020 at 5:31pm |
I think and worry about you all the time. Glad to see you post. I have to thank you for noticing that I have a rusty washer to keep from wearing the cotter key.  Here is the picture you ask for. I remembered where to find this one that was with the first ones I posted which took several minutes to find them. That shows my memory is better than even I expected. Dixie tells me I am absent minded in my old age. I tell here she is being silly as I don't remember being absent minded. 
Edited by Dick L - 20 Nov 2020 at 5:32pm
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