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John Deere Tractors Discussion Forum
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The D finally runs/more questions (long post sorry

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B. Duncan

09-26-2006 09:17:44




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Hi all,
Well finally after 2 years of off and on work my Dad and I finally got my 39 D poppin this saturday. I had never heard the tractor run until then so it was a surprise. We had all sorts of probs to get it started. Carb, Carb nozzel, Mageto out of time, missing flyweight on the governor, leaking head gasket just to name a few. The tractor sounds great with the straight pipe. Oil pressure is close to the H mark and the temp never got above 170 with the shutters open. Since I have never heard it run before there seems to be a surge in the carb or governor. I can hold the gov rod and just control the carb and it will idle and accelerate fine. Could it be out of adjustment or a weak spring. Also while it was apart we installed new clutch disks and replaced the felt seal on the clutch pulley. However while it was running for the 4+ hours i noticed a little oil was being slung out of the pulley cover. In the parts breakdown I dont see another seal or gasket. Am i missing something. Sorry for the long post. Thanks in advance for all the help and advice

Brad D

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Skyhawk Greg

09-26-2006 12:17:25




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 Re: The D finally runs/more questions (long post s in reply to B. Duncan, 09-26-2006 09:17:44  
Brad, Hope you caught what I consider to be an important sentence from Glen (the one that was almost hidden within all the other good information) - "What happens when you adjust or open needles more on the carb?". This is very easy to do, and the results can be immmediate. I just had a D with this problem. Putting in good gas, and a few moments spent on turning the idle mixture screw, and it was fixed. Good luck!

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Glen in TX

09-26-2006 10:31:32




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 Re: The D finally runs/more questions (long post s in reply to B. Duncan, 09-26-2006 09:17:44  
Hi Brad, Glad to hear it's running now. Sometimes you just need to turn the carb throttle stop screw in some against stop spring till it runs even. Late D engines are rated at 900 rpm loaded and should not run over 975-980 rpm high idle. The throttle and governor rod needs to fit in holes well and not have to be forced in or held down to get cotters in or it may be bent. The cotter is removed in sleeve on spring on rod and sleeve is moved forward toward carb to increase speed 30-50 rpm or back to decrease. I take it you overhauled the carburetor completely. Sometimes if throttle shaft, bushings or butterfly is still worn bad it can cause that. Some have even had the wrong shaft or butterfly in one causing problems like that also. What happens when you when adjust or open needles more on carb. Make sure ventilator tube from governor to air cleaner casting is clear and open and breather is clean or excess crankcase pressure will push oil out mains causing problems. The dust shield behind clutch needs to be centered so it doesn't rub on clutch pulley and only has a gasket behind it and had lead washers originally on bolts to help during aligning it. The shield also acts as a slinger inside to keep oil back on other side of reduction gear cover so it could just be out of line or bent someplace. I didn't think there was any kind of drain hole on it.

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B. Duncan

09-27-2006 03:23:41




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 Re: The D finally runs/more questions (long post s in reply to Glen in TX, 09-26-2006 10:31:32  
Thanks for the input guys. I will try with the carb a little more this weekend. Thanks again
Brad



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