You mentioned it was slow cranking over. The Dubuque series tractors,(M,40,420,430), had a bad problem with poor grounding of the starter motor to the engine. It is held in place with just one large pointed setscrew and a lock nut. Remove the starter from the tractor, clean up the holding screw and where it tightens against the starter nose cone. Then run a large gauge,new ground wire from the battery post to this bolt after you install the starter back in place. Be sure and clean the area where the cable end will be under the bolt head to provide a good connection. Some times you may need another ground wire to the frame also. A poor ground connection can/will cause many issues including a poor spark issue because it is a battery ignition system. The 6 volt battery system cranked these tractor just fine as long as the cables were large enough to carry the huge amount of amps in the 6 volt battery and the connections were clean and tight. 12 volt size cables are not large enough to do the job. I was working for a Deere dealer when these tractors came out.
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Today's Featured Article - Talk of the Town: The Saga of Grandpa's Tractor - by The following saga is from the Tractor Talk Discussion Forum. Someone. The saga starts with the following message: Hey guys I have a decision to make. I know what you all will probably suggest and it will probably agree with me way down inside, but here it is. I have a picture blown up and framed in my "tractor room" of a Farmall M. It was my Grandpa's tractor, of which whom I never got to meet. He froze to death getting this tractor out of the barn to pull a truck out of the ditch before I was born. Anyway my dad and aunt had to sell it at the auction,
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