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John Deere Tractors Discussion Forum
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A JD puller

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Jim Johnson

11-19-2006 06:44:23




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I have a friend that has an A that is not built up but pulls good but every time that the load hits it it misses two beats and then pulls great. Can't figure out the reason thought maybe one of you could come up with something we haven't tried.




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2 Cylinder

11-19-2006 09:58:33




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 Re: A JD puller in reply to Jim Johnson, 11-19-2006 06:44:23  
I"m not a carb expert, but I can tell you that I had a JD-A that did the same thing going down the pulling track and it was because the carb settings were to rich. I was going to try a higher gear, so I gave it more fuel, started missing. Luckily the transfer sled malfunctioned and I got another crack at it, set the carb back where I originally had it and it ran like a top. You can have it to lean, but also to rich. Your best bet to iron out the missing problems would be to put tractor on a dyno under a load and make adjustments for peak performance and reliability. As stated by others, probably wouldn"t hurt to take carb apart and clean also, they sometimes get sediment buildup in them that will make them miss.

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John T

11-19-2006 08:12:06




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 Re: A JD puller in reply to Jim Johnson, 11-19-2006 06:44:23  
Jim, It could also be carb related, does richening up the load needle seem to help??? Id sure try that first..... .

If I understand it correctly (Im NOT any carb expert) the quasi acceleration pump function (to provide sufficent gas on sudden load or acceleration) is performed by the excess gas stored in the well around the carbs main center brass nozzle which can get sucked up into the venturi as needed for a sudden load change. HOWEVER if that and/or the nozzle is clogged up that extra gas isnt available when needed so she sputters upon acceleration. A removal of the center brass nozzle (may require making a puller) and cleaning it and all its lil side holes and cleaning the other passages while inside there may be in order.

I will be looking forward to what the carb guys think????? ???

John T

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Paul from MN

11-22-2006 10:13:16




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 Re: A JD puller in reply to John T, 11-19-2006 08:12:06  
I think John T nailed it. That is exactly why the nozzel has holes on the side. Those holes will get clogged over time. The only way I know of to clean the nozzel is to remove it and bead blast it. This is often overlooked. Getting the nozzel out is a bit of a trick. Not hard to do, but a bit of a trick. If you'd like to try it, email me.



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Mike M

11-19-2006 07:29:52




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 Re: A JD puller in reply to Jim Johnson, 11-19-2006 06:44:23  
Get the engine warmed up fully before you put the load to it. Adjustments need to made at that temp. also because they can vary from cold to hot.



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