Unstyled JD A Governor Issues!

[Navajo350]

I took the throttle rod of the carb when running. I manually moved the butterfly to the open position to see what the governor did. It did really nothing. So I don't think it's the spring.

Inside the governor, everything looks fine, free, and like it dhould work like it's suppose to with the weights, bearing, and fork. The shaft that the for is on is going the right way and the governor spring is facing the right way.

The throttle rod is adjusted a half hole a full throttle. I hit 1000 to 1100 RPMs at mid throttle range. If I go past that, the RPMs will go much higher. I have the rod between the governor and throttle lever rod adjusted almost to full length, when it was shorter, it was worse. Stopping bolts, the one for adjusting full throttle is not long enough to keep me from moving the lever too fast. Again, this is only mid throttle range anyway. They are the correct bolts.

The tractor idles fine. It runs good. I'm at the last issue here I believe. If I can get this problem fixed soon, I can take it to a show this weekend.

Everyone's help would be appreciated!!

 

[teddy52food]

If you can move the flyweights all the way out, the throttle should be closed. If not, find out why.

 

[DeltaRed]

The butterfly one half open at full throttle at no load (fast idie) is correct/normal.Only when a load is encountered will it open
further.The governor does that.Easy to check. Just drive it.Go up a hill,step on the brake.Just put a load on it. If it pops
louder and maintains RPM,the gov is working. If the motor slows down and lobors,the governor may be suspect.The governor
acctually has a 'two fold' job.It maintains constant throttle operation,keeps the RPM to a safe/normal level. It also maintains
rated speed during working conditions. Light pulling-heavy pulling.The governor gives more fuel during those heavy load times,It will decrease the fuel delivered at light load times to maintain RPM.The Governor keeps the engine running at the 'optimum' place.That is why onehalf butterfly at 'fast idle is normal.To allow room for the extra fuel needed at full load conditions.

 

[Steve@Advance]

You can't adjust the governed speed by changing the length of the throttle rod. The speed is set by the amount of pull on the spring in relation to the position of the hand lever.

With the hand lever set for idle, the rod should be just long enough to push the throttle plate closed. If you try to over ride the governor, you should feel it try to push the throttle back closed as the RPM come up. If you don't feel this happening, either the rod is out of adjustment, of the governor is not working.

Once you get it to the point you feel it work, set the spring tension so the RPM won't exceed the rated RPM with the hand lever set at full speed.

You can then watch it work. When set for full speed, over ride it back to idle. Release it, the throttle should go wide open until the engine comes up to speed, then the gov will throttle it back to maintain rated RPM.

 

[Navajo350]

Set the spring tension? The governor spring? Adjusted by the rod between the governor and vertical throttle rod?

 

[Steve@Advance]

Not familiar with the exact model, but when you move the hand lever, the faster you ask the engine to run, the more stretch you are putting on the governor spring. You adjust the speed by the amount of pull the hand lever is applying to the gov spring. There will be some way to adjust the amount of pull on that spring when the hand lever is fully in the fast position. That will set the RPM to the rated engine speed. (975 according to Tractor Data)

 

[Steve@Advance]

Remember, the spring wants to pull the throttle plate open. The spinning weights in the governor want to push it closed. It's a balancing act between the 2 forces.

 

[Navajo350]

(quoted from post at 13:03:52 09/02/15) Remember, the spring wants to pull the throttle plate open. The spinning weights in the governor want to push it closed. It's a balancing act between the 2 forces.

Thanks.

I started it for the first time today. Adjusted the stopping bolts for the lever range, and got it to govern at the full throttle I set it too, 1100rpms. I ran it a bit, and now when the engine is warm, the engine runs away again. Even at little throttle.

 

[Pete in MD]

" I ran it a bit, and now when the engine is warm, the engine runs away again. Even at little throttle."

I think you'll find that the cast governor arm that attaches to the vertical shaft coming out of the governor is not adequately locked on the shaft. When the engine runs away the shaft turns like it should but the arm doesn't move to close the throttle plate.

The square head lock screw that holds the arm on the shaft should have a smooth, reduced diameter at the inner end on it. This end goes into a small blind hole on the shaft and locks the arm to the shaft. There should also probably be a jam nut on the screw.

Everything I've said is based on your statement that the engine runs away at little throttle (idle).

Did you have the arm off the governor or loosen it when you looked inside the governor innards? If not, a previous owner didn't set the screw correctly.

 

[Navajo350]

I made sure when I put the tapered bolt back in, that it was going into that groove, or aligned with that groove I should say, and matched up on to the tapered hole. There is still a jam nut on that little square headed bolt. It's not missing. I will check again though to see if the tapered hole is clean and perfectly in the groove again. Good point, thanks.