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John, So many carbs used on the JDs and others that it could get kind of long but the DLTX seems to give most the problems it seems. Those are covered on Pat B's site and at Roberts Carb Repair site. Just a note here to explain if someone has JD tractors or engines needing carb work or even other tractors with same style carbs the JD SM2024 Service Manual for Carburetors used on JD tractors and engines covers about 75 different gasoline and LPG carburetor models used on JD tractors, power units, combines, balers, hay presses, beet harvesters, cotton pickers, forage harvesters, & windrowers. For JD it covers carbs used on A to 730 tractors like the Marvel Schebler DLTX single & dual induction models, Marvel Schebler TSX carbs used on L,M,40,420,430 and other engines and brands, Zenith carb models 61, 62, 68, & 161 series used on many power unit or combine engines, LP carbs, TSG LP carbs, Zenith TU carbs used on 70-830 pony start engines, Marvel Schebler SL-2 used on R pony engines, and a 2 barrel Zenith OE1539B that was used on some 95 combine engines. The SM2024 can be obtained from JD Publications on paper for about $45 currently and you find it on the JD tech pubs site only by typing in "carburetors" in the search box. You don't find it on their site currently listed with manuals for tractors but they did once list it that way in paper catalogs for dealers and customers. Other ways to order it are by calling them direct at 800-522-7448 or if you go through your dealer or JD parts site I recently found the SM2024 priced through my local dealer at JD Parts site for $48.15 on paper or SM2024CD on CD disc for $32.10 but the JD Tech Pubs Dept. should be able to price it to you on CD also but their site wouldn't let me. It's a good carburetor manual for the money for carb theory and overhaul but still won't answer everyones questions and doesn't advise things like running drills by hand through the passageways or other trouble shooting tips. The SM2024 gives some specs for the early D and GP carbs but not really a overhaul section on those. The early D and GP carbs are covered some in one or two pages quickly in the SMF116 Service manual for JD D & GP tractors and E engines. Many have found Cork Groth to be knowledeable also on the early GP carbs and he has done seminars at GOG and other articles on carburetors. Frank has a lot of good restoration info on his site also www.fboerger.com JD Publications Dept. http://techpubs.deere.com or 800-522-7448 JD parts online http://jdparts.deere.com JD Industrial Publications www.jdtechinfo.com or 866-213-3373
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