Good luck! It's a mess, but someone spent a lot of time on that. I'd start by taking photos of everything, then I'd carefully dismantle it, clean everything, then slowly put it back together making sure everything gets a drop of oil. As long as the wheels turn freely and the rods don't bind, I'm sure it runs - those old motors are hard to kill. I personally prefer to have gone through everything, making sure everything is free, before trying to run anything.
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