On some of the 4020's the starter brush dust will pile up and cause a partial short circuit. This will drain the batteries after a couple days. Short of removing the starter I don't know if there is a way to jar or blow it away.
You either have a dead cell in the battery which is draining power or something is on draining power. On a tractor there is not much to be left on, so check everything. It is more than likely a dead cell and a new battery is in order. To check the alternator to see if it is charging, start the engine and with a volt meter check the voltage at the battery. If it is reading between 13.5-16 volts the alternator is more than likely good. If any lower than 13.5 it is defective.
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