Ford 3000 governor linkage issues

I have a late 60's Ford 3000 Gas 3-cylinder that the governor linkage is giving me issues. The good - The tractor starts, runs and idles perfect. The bad - When you throttle the tractor up, there is zero movement from the governor arm that is attached to the throttle shaft on the carb until it gets to about 2/3rds throttle. So the tractor will literally jump from idle to 2/3rds throttle, you cannot get it to sit in between unless you bump the governor arm with your hand. It then works as it should from 2/3rds throttle to full throttle as well as when you reduce the throttle down to idle. What I know - Both springs are in place on the linkage (the larger one that attaches to the manifold and the one near the governor lever that only has a hook on one end.) Also, there is not a bind in the throttle shaft (it's brand new and moves freely) and I have lubricated the governor arm and it doesn't seem to have a bind in it as well. I have also made sure every joint/ connection on the throttle linkage is lubricated and moves freely. Could this be an issue with adjustment of the governor or the linkage? I don't see anywhere that the spring tension on the linkage can be increased (which seems like it would correct the issue) and I'm at a loss. Can anyone provide me some insight on this?

Sounds like adjustment problem.

First look at the spring that pulls the throttle plate open. Not running,it should let the throttle just go closed at idle. Hold slight closed pressure with your fingers, reach up or have an assistant slowly move the hand lever toward full speed. You should feel a steadily increasing spring pressure as the throttle plate is pulled open. If it jumps, or gets all the tension suddenly at the end, something is wrong, either binding or wrong spring geometry.

If that checks out good, remove the link from the gov arm to the throttle plate. Hold the throttle plate closed, have the assistant start the motor (and stand by to kill it just in case!) Push the disconnected gov link to the throttle open position and hold it there. Carefully bring the RPM up and feel for the gov link to start pushing back, as it would be closing the throttle if it were connected. It should provide steadily increasing pressure as the RPM increases, eventually lining up with the hole in the throttle plate in the closed position. If it doesn't come back far enough, adjust it a little longer so it is capable of fully closing the throttle, and still has enough travel to fully open the throttle.

Theory is, the spring from the hand lever to the governor link is trying to pull the throttle plate open. The spinning weights in the governor are trying to push the throttle closed. It's a balancing act between the force of the spring and the power of the spinning weights.

Sounds like an adjustment issue. Do you have a manual? There is an adjustment procedure that starts with taking off the governor link and adjusting it to a specific length. There are two styles of link so two lengths. There are also adjustments on the links from the throttle lever and governor to carb. I'm going from memory here and it's not an easy procedure.

. Thanks for the replies Mike and Steve. I plan on picking up an IT manual this weekend and working on it. I do know from playing around with it last night that the lever jumps when you get to 2/3rds throttle even when the tractor is off. I will look in the manual to see what the adjustments are, but do you think it's possible that the big spring on the throttle arm is stretched or weak?

That's a possibility but get the manual and set it properly. Then see how it runs.

Ok sorry for the delayed response. I got the manual and adjusted everything as directed. It helped the issue a little bit, but did not completely fix what was going on. The tractor was needed so I was not able to continue tinkering with it, but I have a feeling that it may have been an issue inside the governor. I appreciate the responses, maybe if I get a chance to work on it again in the future I can let everyone know what I find.