Cub lowboy won't accelerate

mdm1

Member
Location
Onalaska,WI
My Dad has a cub lowboy that will idle but will not accelerate. All the linkages appear to be connected. If you move the linkage from governor to the carb, the governor will pull it back to idle almost immediately I am not to familiar with governors if that is what it is so any help is much appreciated. I will admit that I do have orange tractors.
 
Most throttle linkage is set up so it pulls a spring in some way which is hooked into the governor system and if that spring is missing or broken it will cause that. Slowly move the throttle control and watch things move and you should be able to trace down what and where the problem is
 
As old indicates, the linkage to the governor is likely the problem. The hand lever has either a rachet like positioning system,
or a spring loaded friction pad at the lever pivot. If the teeth on the lever or quadrant are worn, it will slip to idle. If the
pressure spring on the friction style is rusted or weak, it will return to idle. Jim
 
We didn't have time to pull the hood and won't get back to it until next week. I will do that and see what is going on. Thanks for the suggestions!
 
Took the hood off and the governor spring is broke. Have one ordered. Looks like fun to install. Thanks to everyone that responded! Mike
 
We installed the new spring and adjusted the linkages. But now it has a surging problem. It doesn't surge when he engages his mower but it does all the other time. I adjusted the bumper screw and it worked for alittle while but started surging again. Should I replace that spring also? It is not broke but may have lost its tension. How far in should it be?
 
BTW, the governor pulling back when you pull the rod between the governor and the carburetor is normal. That's what a governor does. At that time the governor was set to "idle" and will adjust the carburetor throttle plate to maintain idle RPMs. You pulling the carb open made the engine speed up, so the governor naturally pushed the carburetor closed to get back to idle RPMs.

Have you adjusted the linkage between the governor and carburetor since you replaced the spring? Engine off, unhook it at the clevis. Move the throttle lever to wide open. Hold the carburetor butterfly wide open. Adjust the length of the clevis so the pin slides through the clevis and governor arm easily. If it's off a turn or so that can cause surging.
 
I have done the linkage adjustment as mentioned. We did pull the governor out to attach the spring. We did not move anything so I hope we didn't change the timing. The tractor runs really quite well under load and today we adjusted the bumper spring again and it seemed to clear up. We will see I guess.
 

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