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 - New Life for an Old Allis - by Tyler Woods. My friend Jon, has an old '39 Allis Chalmers B. He thought it a marginal tractor that had long since served its time. She smoked terribly and never had much power but he couldn't afford another so he was limping along with what he had. Jon's Allis has a small front loader and though it doesn't carry much, it serves his needs. It was the hard starting and low power that made him think it was time to replace the old girl. Jon called me to help him discover why his tractor wouldn't start
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