Farmall A running wide open

RC661950

New User
My 1940 A sat over a winter, then for no reason, only runs at full rpm unless I hold rod from governor to carb ahead. It has a new spring (
years back I rebuilt everything)in the housing, bearing looks ok, has good spring tension not running (between levers), weights move
freely,and not sure where else to look. I have service manual and have rebuilt some before so I have some experience with them but just
replacing springs, bearings, etc. It has sat about 5 years now since the problem started and finally trying to fix it so I can run it. Any
thoughts will be appreciated.
 
So are you saying it was working correctly then you let it sit and now it runs wide open?? Or are you say it was doing that and you have checked every thing and can not find a problem??

The way you word this sounds like you fixed the gov years ago and then parked it and it has not run for a long time and now it has a problem with the gov again correct?? If what I just said it correct good chance from sitting the weight in the gov have rusted in place so now it is not working as it should
 
I had fixed it up years back, including rebuilding governor, it ran fine for a few years, then after sitting one winter it ran wide open..then I just never got around to fixing it which I'm trying now. It had a little rust on outside of bearing after taking it apart last night, but now cleaned and oiled it. The weights move freely.. I was hoping to find that as the problem but not the case. If all else fails I'll change the housing from another motor to see if it makes any difference
 
Make sure all the linkage moves freely. I have had problems where a cross shaft rusts and then the linkage will not move like it should
 
When the engine is not running,and you have the throttle in idle position,is your throttle at the carb at idle or full rpm? When you have the engine running,is it hard to push the throttle back to idle? Or is is light spring tension?Observe the movement of everything with engine off,and see if your linkages all move where expected-idle at throttle lever in idle position,and off idle the throttle at the carb should have increasing spring tension, towards wide open, as you move the lever to high rpm position.If not study the linkage and springs.I would guess there is a spring pulling linkage in the wrong direction.Mark
 
The governor spring makes the engine run fast and the action of the weights flying outward slows it down.

For all this to work, the length of the linkage between the governor arm and the carburetor has to be correct.

Short version is that the carb throttle shaft must hit it's wide-open stop just before the governor arm reaches the end of it's travel in that direction.
 
I want to say that with engine off ,throttle in idle position that the carb arm is correct , but will get my Super A next to it and comprare everything side by side, and will check cross shaft to see how free it moves again
 
Has the throttle plate possibly come loose from
the shaft?

Does the engine slow down when you push forward
on the linkage?
Jim
 
Have you set the linkage with engine off remove the pin in the clevis going to the carb then open throttle now adjust clevis so it holds carb open.
 
Things seem to be tight...yes, it slows down and runs fine when controlling linkage to carb by hand against the spring tension. I found a spare housing I rebuilt some time ago, gonna bolt it on and see what that does tmrw.
 
We've checked everything..looks exactly like pictures in manual, switched the housing with another one and does same thing. the weights, bushing, and bearing all move and look fine. We thought we had it a few times and corrected small things we found , but still leaving 3 of us scratching our heads over this.
 
Have you checked the throttle bracket on the end of the carb shaft like brownie suggested those do get loose and cause problems just had one on a Cs carb that was loose and caused problems
 
Just for grins, drop the carb off and make sure the throttle plate is not loose, or missing a screw.......unlikely, but a really quick elimination of something that could cause that type of symptom.
 
I just saw that Brownie450 suggested the same thing, but in different words. Still, I would check that if you haven't. Takes 10 mins.
 
Actually I think that may be the problem..it has a replacement carb on it with "fits all linkage" and it is not tight.. I'm going to
investigate as soon as I can get back on it..got too dark last night to go further
 

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