In article 66a97b76-8547-4465-a760-07b9fbff7d15
@b64g2000hsa.googlegroups.com, (Just Me) says...

In short, I have no idea of what the maintenence procedure for this
thing may be.

Not much. If you can flush the chain case and re-fill with a good gear
grease, and change the motor oil, that's about it. It's a simple
machine. When the seals go, you can replace them, or just lube it
before each session, at your option. For something that old, you may
not be able to get replacement parts. If you are lucky, they built it
with off the shelf seals and bearings, which means you might be able to
keep it running forever.

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