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John Deere Tractors Discussion Forum
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Governor or Carb or ?

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BUDD

08-31-2003 05:04:48




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I have a 49 "A" that I pull with. I have been tweaking on this tractor all summer and have gained on it some ( with the help of you on this board, thank you). It will pull consistent every weekend for the most part. When I hook to the sled and take off the it goes good for a few feet and then I loose MPH rather fast to a point and then it just hangs in there for a good pull. My question is why am I losing MPH before the butterflies open up all the way? The linkage is set per the book, the governor seems to be very sensitive as it will jump when driving down the road if your not careful on take off. It is bored .125 over, 148 psi at the plugs with a Distributor and hot coil. I have Dynoed this tractor several times (50 @ rated rpms and will pull down to 56 hp) and everything is adjusted to where it needs to be for the most power. Anybody have any ideal on this? I know this is not the pulling board, but I have gotten more help here with all the knowledge you have than on the pulling board.

THANKS>>>>";"<<<

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Rick K

09-01-2003 07:34:54




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 Re: Governor or Carb or ? in reply to BUDD, 08-31-2003 05:04:48  
One other thing you might want to experiment with is your idle mixture adjustment. I had a similar problem wiht my G puller as you describe. Additionally with no load on the engine, I could pull the throttle lever back from wide open position about 3/4" without slowing the engine down. I had been through the govenor and installed new weights and made sure the fork was not flat spotted so I knew I had to look elsewhere to solve the problem. I found that if I richened up the idle screw (about 1/2 turn in my case) both of these problems went away. Evidently I was getting a lean out condition at high idle before the butterfly opened far enongh to bring in the main metering circuit. I now runs a little rich at low idle (slight smoke out of the stack) but I don't have the quick inital speed drop off when pulling. My 2 cents.

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Earl S.

08-31-2003 08:50:33




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 Re: Governor or Carb or ? in reply to BUDD, 08-31-2003 05:04:48  
If everything in your governor is like new,brgs,weights,pins check to make sure the fork that is against the thrust brg is well rounded and not flat where it makes contact to thrust brg.The surface of thrust brg flat,no low spot.Also the surface that contact the Gov. weights.Gov. weights will wear flat where they contact sleeve.Make sure the fork is centered properly and not dragging on the sleeve. One of the most overlooked because the arm and housing wear after 50 yrs.The lingage from gov. to carb.will twist when you tighten jam nut. Make sure the rod isn't dragging somewhere. The COTTER KEY on the carb has to be free and clear.I always use a thin washer on the top side of throttle rod to carb.Earl In Illinois

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ChuckW

08-31-2003 05:58:44




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 Re: Governor or Carb or ? in reply to BUDD, 08-31-2003 05:04:48  
am not a puller rather a restorer, however I have seen the pullers use two governor springs, cutting one off slightly eliminating the linkage hole. I suppose they are trying to keep the rpm high when leaving the line? To my knowledge short of different weights there is very little way to control the governor. Now you may have wear where the governor arms has been riding in the sleeve. This may make for some delay. Tweaking these tractor is not easy...I am trying to tweak a power steering set up myself. Most of the old tractors even when new ran so so and farmers just left them at that.

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BUDD

08-31-2003 06:18:33




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 Re: Re: Governor or Carb or ? in reply to ChuckW, 08-31-2003 05:58:44  
I am having just about as much fun tweaking as I am pulling. I have learned so much and one thing is that these JDs do NOT compair to anything I have worked on before.

BUDD



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