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 and the connections were clean and tight. 12 volt size cables were 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 - Product Review: Black Tire Paint - by Staff. I have been fortunate in that two of my tractors have had rear tires that were in great shape when I bought the tractor. My model "H" even had the old style fronts with plenty of tread. My "L" fronts were mismatched Sears Guardsman snow tires, which I promptly tossed. Well, although these tires were in good shape as far as tread was concerned, they looked real sad. All were flat, but new tubes fixed that. In addition to years and years of scuffing and fading, they had paint splattered on
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