John Deere 40 governor issues. HELP

Hey guys. This is my first post and I am sure not my last. I have gotten my hands on a 1954 40T with wide frontend. I replaced all fluids, plugs, wires, cap, points, etc. The issue I am having is I believe the governor. The tractor will fire right up but idle, mid, or full the tractor doesn't run right. If I hold my hand on the throttle on the carb it runs great but as soon as I remove my hand it starts to run rough again. I called myself cleaning the carb fairly well. Any suggestions or ideas would be awesome but I believe the governor is my issue. Where can I find parts, another governor, rebuild, etc for my tractor in regards to the governor?

Is the cab to govenor throttle arm jerking back and forth?
Will the engine run smooth if you hold that arm stationary?

If I hold my finger on the throttle on the carb to hold it steady it runs great. The arm going to the governor is moving back and forth like it is hunting.

I would tend to loom at the linkage of the throttle system. It probably needs to be adjusted as the yokes are worn out. Also, if I remember correctly, there are a couple of springs in the system. Are they there or missing?

Carburetor needs adjusting or cleaning.

?<font color="#6699ff">[b:654c4848f0][i:654c4848f0]Where can I find parts, another governor, rebuild, etc for my tractor in regards to the governor?[/i:654c4848f0][/b:654c4848f0]</font>?

You might consider adjusting the governor linkage.

Reviewed the [b:654c4848f0]SERVICE MANUAL SM2013 JOHN DEERE 40 SERIES TRACTORS AND CRAWLERS[/b:654c4848f0] in the [b:654c4848f0]Governor[/b:654c4848f0] section under the [b:654c4848f0]INSTALL AND ADJUST GOVERNOR LINKAGE[/b:654c4848f0] heading in the [b:654c4848f0]Governor Connecting Rod[/b:654c4848f0] topic on page 70-5-6.

Take a look at the diagram below.



Note the speed control lever (Key 2), governor control rod (Key 7), and connecting rod (Key 15).

[b:654c4848f0]Governor Control Rod[/b:654c4848f0]
?[b:654c4848f0][i:654c4848f0]Move speed control lever counter-clockwise as far as possible (slow-idle position).

Slip flat washer over end of control rod ( B ) and slide connecting rod ( A ) into place on control rod.[/b:654c4848f0][/i:654c4848f0]?

Take a look at the photo below.



?[b:654c4848f0][i:654c4848f0]Push governor lever ( C ) as far down as possible and turn adjustable yoke until hole in yoke lines up with the hole in governor lever. Then unscrew yoke two complete turns. This insures that governor lever is tight against stop pin when governor control rod is against stop on control rod front bracket. Insert pin through yoke and governor lever and secure with cotter pin. Tighten lock nut on connection rod against adjustable yoke.[/i:654c4848f0][/b:654c4848f0]?

Take a look at the photo below.



?[b:654c4848f0][i:654c4848f0]Move speed control lever to its wide open position and install second flat washer and spring on control rod ( B ). Be sure spring is seated in grooves provided for it.[/i:654c4848f0][/b:654c4848f0]?

[b:654c4848f0]Governor-to-Carburetor Connecting Rod[/b:654c4848f0]
?[b:654c4848f0][i:654c4848f0]Insert the ball joint of governor-to-carburetor connecting rod ( E ) into governor operating shaft lever from outer side. Tighten nut securely.[/i:654c4848f0][/b:654c4848f0]?

Take a look at the photo below.



"[b:654c4848f0][i:654c4848f0]With the speed control lever in the wide open position, move the carburetor throttle shaft arm ( F ) as far forward as possible. Adjust length of governor-to-carburetor connecting rod ( E ) until it will just slide into hole in carburetor throttle shaft arm. Then turn rod into ball joint two complete turns, and secure it to carburetor throttle shaft arm with cotter pin. Tighten lock nut against ball joint.

CAUTION: Check to make sure that air cleaner bracket does not interfere with governor lever movement.[/i:654c4848f0][/b:654c4848f0]?

Take a look at the photo below.



Hope this helps.

Awesome. I will try to adjust according to this and go from there. I pulled the carb again last night and going to go threw it one more time. I will report back with whatever I come up with. Thanks guys

When you are looking at the carb, with it apart, back off the idle speed screw and gently fully close the throttle plate and note if it fits closely to the bore, look at it towards light and see if there's a gap at one side or the other.

If so, slightly loosen the screws and move the plate a bit so it closes evenly to the bore.

(A throttle plate that doesn't fit well can affect how the idle circuit works and how the carbs transfers from the "idle" to the "load" circuit.)

Too much "gain" will make a "proportional" controller "hunt".