Thanks for the reply's everyone. I ordered a new pulley from ebay. It was $50 for the OEM pulley and this one seems better and cheaper.
I pulled the pressed in 1/4" oil plug and found saturated wicking material in there. I assume they used a plug for the same reason it is a sealed housing. The amount of crud that would end up inside would kill it pretty quick. I don't know what the service interval is, the wick is saturated with oil still. I havent added any in 25 years.
If this unit used a bronze bushing and oil wick it does it need the seal to prevent oil seepage onto the commutator. Would a sintered bronze bushing hold the oil better and maybe get away with out the seal. Either way I decided I'm not going to replace the bearings or bushings right now. Just going to get the field coil replaced and put it back together. A lot more things to fix before I can fire this tractor up.
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