JD M governor runaway

Ford4100

New User
1950 JD M governor is running away. Advance
throttle and revs way up and stays. Weights
move freely. Any help would be helpful.
 
What's the "rest of the story", has the tractor been in operation, and working correctly, or are you getting a neglected machine running again?

The governor spring acts to open the throttle, the weights act to counter the pull of the spring an hold the RPM's in check.

You say the weights move freely, are the little "fingers" on them that contact the thrust bearing intact?

Is the thrust bearing complete and intact (14)?

Next, the thrust bearing contacts the "fingers" on the governor fork (13). Are they intact?

Is governor-to-carburetor rod length adjustment correct?


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Thanks
It's been restored and just got it running.
The fingers are intact and move trust bearing.
Not sure on gov to carb rod will check.

More info when you advance throttle it revs way up and cant get rpms down without shutting off.
 
(quoted from post at 08:24:10 07/02/20) Thanks
It's been restored and just got it running.
The fingers are intact and move trust bearing.
Not sure on gov to carb rod will check.

More info when you advance throttle it revs way up and cant get rpms down without shutting off.

Do you know if the carburetor has been changed?

If it's been changed (or overhauled incorrectly) it's POSSIBLE that it's set up wrong and the butterfly is actually OPENING when the governor is trying to close it. (wrong throttle shaft, butterfly incorrectly installed, etc.).

Without starting engine, note which was linkage to carburetor moves when you advance the throttle lever.

You'll probably have to take the carb off to do this, but figure out if that linkage motion is opening or closing the butterfly.

Should be OPENING it, so when the engine is started the governor does the reverse and CLOSES the butterfly as the engine speeds up.
 
Thanks, we will looking into that.
We are finishing it for a friend who passed
away so his family can put in a museum
 
(quoted from post at 11:59:45 07/02/20) The butterfly arm was the wrong one there was two in rebuild kit. Thanks for all the help!!!

YAY!

A relatively simple fix!
 

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