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John Deere Tractors Discussion Forum
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'51 A govener searches

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JDW

07-17-2004 09:01:20




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I am working on a 1951 model 'A' for a guy, and after some time I finally got around to getting it running again yesterday. One problem... it does the same thing it did when he brought it to me. The engine (govener) searches badly. I have tried to adjust the rod between the carb and gov but to no avail. The carb is perfectly clean and rebuilt, and so is the air intake system with proper weight oil in the cup. Rebuilt distributor and govener. Carb must be in proper adjustment as it starts well and has plenty of power under a heavy load. This also makes me think the timing must be close to perfect. Engine is tight and blows no smoke what soever. What about different gov. springs? Maybe the throttle rods are not original to the tractor? any ideas?

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Mike Aylward

07-18-2004 07:50:15




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 Re: '51 A govener searches in reply to JDW, 07-17-2004 09:01:20  
JDW, just to add to the fine information that John and Frank gave you, I see you mention governor "springs". Does this, by chance, mean you have more than one installed? If so, the governor will never work right. If this tractor had been pulled at some time many pullers mistakenly think that this will help the performance of their tractors. It doesn't. Check to see if there are two springs or that something has been done to alter the spring. Hope this helps. Mike

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John T

07-17-2004 13:55:56




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 Re: '51 A govener searches in reply to JDW, 07-17-2004 09:01:20  
JDW, In addition to Franks remarks concerning external to the Governor solutions, on the inside when the weights n pins they ride on get worn extreme, she never has the correct quick smooth acting response. If none of the external things like rod length adjustment or spring replacement does the trick, it may be time to get inside and while there repair/replace any weight or pin problems as well as bearings and the fan shaft bevel gears if needed.

Make sure theres no bindings in the linkages, especially no cotter pins or wires which might hamper smooth linkage action, like in the rod to carb linkage.

This all assumes the carb is okay as you indicated and shes not revving up n down like they can do when the carbs idle circuit is plugged. A small amount of choke dont make her work better does it (like fuel starvation problems) and adjusitng the carb tops load n idle needles dont help, right???

Im not much of a governor man, so thats all I have to say about that as Forrest Gump would say.

Good Luck n God Bless

John T

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Jason Wahl

07-18-2004 12:19:17




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 Re: Re: '51 A govener searches in reply to John T, 07-17-2004 13:55:56  
Yes, all inside pieces of the govenor are in perfect shape and tight to boot! I went throgh all this already after I bought the rebuild video from Robert's Carb Repair. I found three things wrong with it that other 'experts' on two-cylinder tractors in my area missed including my local dealer. Please read my response to F-I-T for more info. Thanks!



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F-I-T

07-17-2004 09:55:10




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 Re: '51 A govener searches in reply to JDW, 07-17-2004 09:01:20  
JDW:

I would ask how did you adjust the rod? If I remember right, at full throttle position and the carb throttle shaft held wide open, you should be 1/2 to 1 hole short from the rod makig it to the throttle shaft hole. When you "pull" on the rod to get it to hook up, that will provide the necessary pre-loading for the flat steel spring on the governor.

Now if that doesn't help, I have heard that what could have happened is that in the past, the flat spring could have broken off, and someone re-fitted it by shortening it. If that's the case, you'll need to buy a new spring, becuase it will never have the correct governor response.

Frank

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Jason Wahl

07-18-2004 12:13:41




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 Re: Re: '51 A govener searches in reply to F-I-T, 07-17-2004 09:55:10  
I adjusted the rod per the I & T shop manual just like you described. Moving it in or out has had no effect at all when it should dramatically make some kind of change. I replaced the govenor shaft with a perfect used one of mine along with the spring it already had on it. This spring is nearly an inch longer than his original one. The parts book (PC675) shows two different springs listed according to SN# breaks.PT# A3408R for serial numbers (584000-672473) & PT# A1491R for #s' (672474-up). Deere's part website says that the A1491R superscedes the A3408R as it's replacement. My point is... If there was a change in springs, then there is a reason why! What was this change? Change in lenghts as I have found? What effect does this have on rod adjustment if any? Also notice two different 'short rod' part numbers for item #7 on page 51 of PC675. Same questions arise on this as well. Even if I buy a new spring from Deere (A1491R), will this work? The parts book says otherwise. What am I to THINK!!!!

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