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 - Diagnosing Engine Difficulty - Diesel Tractors - by Staff. The following suggestions are listed for your assistance. You can make simple adjustments on your tractor that will improve its operation and save you the time and expense of hiring someone to do it for you. Always make one adjustment at a time, and if the adjustment made does not improve the condition, return to the original setting before proceeding to the next adjustment. Hard Starting Cold air temperatures. Insufficient fuel.
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