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37 A throttle/gov/carb linkage

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1 Dollar

12-29-2006 15:48:23

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Got the A back together and running decent but I know something isn't right in the throttle linkages. 500 RPM is basically the lowest it will idle before it hits the end of the range of motion for the throttle lever. If you move it just 3/8 to 1/2 an inch forward to increase RPM's it starts to run so fast that I think it will fly apart if I let it sit there for more that 2-3 seconds. Basically the entire throttle range is 3/8 of an inch. FYI I think that the gov. to carb linkage is correct because I did the 1/2 hole method, I think the main problem is in the throttle lever to gov. linkage. If anybody wants to go through the entire procedure A-Z I wouldn't mind at all. Any help is appreciated.

Thanks

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john chapek

12-30-2006 07:58:47

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Re: 37 A throttle/gov/carb linkage in reply to 1 Dollar, 12-29-2006 15:48:23

yes JDAOS is right thats the fastest way to check the govenor

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Duane Larson

12-29-2006 19:53:36

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Re: 37 A throttle/gov/carb linkage in reply to 1 Dollar, 12-29-2006 15:48:23

1 Dollar,
Good info given below - check the governor as suggested. I would add that if it has a problem Bob Beaver has a good governor repair video that goes through the problems and shows how to completely overhaul one. www.robertscarbrepair.com

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1 Dollar

12-29-2006 22:18:23

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Re: 37 A throttle/gov/carb linkage in reply to Duane Larson, 12-29-2006 19:53:36

Before I started taking it apart (Jan 7 06) it ran fine so I figured that the governor would be fine considering it was fully functional then and I only did a cosmetic restoration. I touched no internal mechanical parts. I'll still look into it though. I'll try that test as well next time I start it.

Thanks

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Duane Larson

12-30-2006 06:37:10

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Re: 37 A throttle/gov/carb linkage in reply to 1 Dollar, 12-29-2006 22:18:23

1 Dollar,
If the butterfly is upside down on the throttle shaft you would see the run away result you observe, because as the governor is trying to slow up the engine it opens the throttle plate rather than closing it. The hole in the butterfly where the governor rod fits should be on the load needle side of the throttle shaft for an A.

One other thought - what is the number of the carb you have on it? If it happens to be from a D (probably 16 or 63) the throttle linkage on the butterfly works backwards from an A carb (the hole in the butterfly is on the idle needle side of the throttle shaft) and that could explain what you are observing relative to the engine running away.

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1 Dollar

12-30-2006 10:34:45

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Re: 37 A throttle/gov/carb linkage in reply to Duane Larson, 12-30-2006 06:37:10

It has a 51 big nut carb.

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F-I-T

12-30-2006 18:11:59

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Re: 37 A throttle/gov/carb linkage in reply to 1 Dollar, 12-30-2006 10:34:45

Was the "Big nut" carb installed on the tractor before when it was running "right"?

Have you verified that the governor action is free and correct by disconnecting the throttle rod at the carb and "operating" the carb butterfly by hand as you feel the governor pull back to limit engine overspeed?

When you performed the "half hole test" did you hold the butterfly full open, the throttle lever full open, and indicate the rod to be a 1/2 hole short?

Lot's to do before you open a governor that was operating fine before you just painted the tractor.

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1 Dollar

01-01-2007 13:55:38

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Re: 37 A throttle/gov/carb linkage in reply to F-I-T, 12-30-2006 18:11:59

yep, been on there for 30+ years

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P Browning

12-30-2006 06:21:02

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Re: 37 A throttle/gov/carb linkage in reply to 1 Dollar, 12-29-2006 22:18:23

1 Dollar -- Once you have dealt with the issues sufficiently to learn you need to go into the governor, it would be a great idea to learn more about what to look for and how to tackle disassembly. The JD Governor is a straight-forward mechanism using the flying weight concept to govern engine speed under varying load cnditions. Overhual essentually means you remove any floppiness in the bearings and in the delicate bellcrank mechanisms that carry the weights. Of course, overhaul also means that you clean -- and verify the oiling passageway is free. You may even have to do some machining and milling to build up a worn surface. Two things you will find (1) The parts cannot be pulled off the governor shaft, so they must be pressed off, and (2) Governor bearings and gears are among the most expensive parts on your tractor. Some simple but special tools were recommended for JD techs back in the early days and outlined in Field Service Bulletins -- FSB 84-S (1938) and FSB 99-S (1939). Having either or both of these in hand may prove helpful as you go into the governor. If you need my help in getting a copy, eml me with a name & mailing address.

Now -- all this having been said, there is a very important relationship between the governor and the fan shaft. You can go to the JD-H Restoration Site to read more about that one. The relationship deals with two spiral-bevel gears (yes, the precious ones) that need not be set too tightly together. This is a hotly debated issue here on the forum -- also discussed in FSB 87-S (1938) and others that followed.

Restoration Site, JD-H

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DRL

12-29-2006 18:58:49

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Re: 37 A throttle/gov/carb linkage in reply to 1 Dollar, 12-29-2006 15:48:23

Yep, sounds like faulty governor. Ran across similar problems on one of my JD's. Upon inspection, found that someone had loosened the set screw that holds the governor arm to the shaft, so the arm was not in the correct position. The set screw is tapered and should go into the slot of the shaft. Also, when they loosened the set screw, the shaft fell down and the fork was riding on the main governor shaft. After everything was put back where it was supposed to go, governor worked flawlessly. Could also be that you dropped a weight off, or could be like another governor I ran across. Engine was so over revved that the weight came into contact with the governor case and chewed them down to nubs. After performing the tests that others have suggested, and the governor doesn't respond, you will need to pull the governor off and inspect. JD governors are pretty simple, but as always a repair manual is always a good thing.

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Mike M

12-29-2006 15:58:30

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Re: 37 A throttle/gov/carb linkage in reply to 1 Dollar, 12-29-2006 15:48:23

Hows your governor and weights sounds like they may not be working ? Grab ahold of the linkage by hand can you feel the gov. pushing on it trying to shut it down ?

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JDAOS

12-29-2006 15:55:16

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Re: 37 A throttle/gov/carb linkage in reply to 1 Dollar, 12-29-2006 15:48:23

Sounds like the governor isn`t working. Take the throttle rod out of the carburator while it is running and hold it with one hand while giving it some gas manually with the carb throttle shaft. The governor rod should be trying to move to slow the engine down. If the governor rod doesn`t move you have a problem in the governor.

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