Google up the AGCO Parts site ( sign in as a guest ) and look up your tractor. Book # 651045, page 56 has all the information you asked for. They list a complete car repair kit # 830942M91 for the TSX 644 or individual part #'s. The Main nozzle #37, pt# 1754659, does NOT come in the kit per the book, please check the numbers I have given you before ordering. As to whether it originally came with the economizer jet ?? If you post the question down in the Massey Ferguson Section you may get a definitive answer.
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Today's Featured Article - George's Fordson Major - by Anthony West (UK). This is a bit of a technical info to add on to the article about George's Major in the "A Towny Goes Plowing" article. George bought his Major from a an implement sale about 18 years ago for £200.00. There is no known history regarding its origins or what service it had done, but the following work was undertaken by Harold alone to bring it up to show standard. From the engine number, it was found that the major was produced late 19
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