According to my serial number list, yours is a 1949 model MD. I could be wrong but I don't believe that any MDs had a battery under the seat from the factory. My '50 model has a spot for the battery under the fuel tank like a regular M. There are also remnants of a battery box located to the right of the seat on the operator platform. As I understand it, the MDs originally had two 6-volt batteries wired in series to make a total of 12 volts. I just use a single 12-volt battery under the fuel tank and it turns over very well.
If yours is like mine, the compression lever is to be pushed forwards to start on gas. This is opposite to my 400 diesel which is pulled toward the operator to start. Once the engine is warmed (about a minute or so) the lever can be pulled back and the throttle is raised slightly to run on diesel.
I can't explain why you have a regular throttle lever. Mine on the MD is a lever to the left of the stearing wheel that is parallel to the ground at idle. It is raised about the same axis as the steering wheel to increase RPMs. Yours might have come from a different tractor?
Good luck with yours. They can be a challenge to bring back from the dead but are well-worth the time and energy. I would definately recommend changing the two fuel filters if yours has been out of commission for that long. Don't be suprised if the fuel pump needs attention too. I've had both of mine apart to clean gunk out and found that they are complicated but can be repaired if you are mechanically inclined. A manual is an invaluable tool....
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