I would bet that your not getting full voltage at the start solenoid from the crank circuit. Take a volt/ohm meter and measure what voltage you are actually getting at the starter solenoid from the switch. This is a problem on many tractors. More so if they have safety switches in that circuit. You have more connections that can corrode.
Also see what your voltage is at the battery cable at the starter while your cranking or trying to crank. I have had bad grounds act this way.You would not get full voltage all of the time until it arced to make good connection.
IF you are getting full voltage than the solenoid itself is bad. So you maybe able to clean it up if it can be taken apart. If it is one that is crimped together than replacing it is your only option.
IF it is low voltage than work your way back to the power supply to and from the crank switch. JD actually made a kit to put a relay right at the solenoid with full power supplied from the battery terminal. This way low voltage from the starter switch circuit would usually activate the low draw relay which in turn gave good higher voltage to the starter solenoid.
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Today's Featured Article - Fordson Model N: Field Service Operations and Lubrication - by Anthony West. The daily or weekly servicing of any vehicle is of the utmost importance, and in days gone by when our favorite tractors were doing an important and Commercially vital job on the farm, these service operations would make a major difference to the running costs and economy of the farm. This being so, it surprises me to see how many enthusiasts attending rallies, shows etc, seem to be unaware of the importance of this constant attention. Possibly the modern machine with its 6,000 mile or even once
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