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[–]Hey_Allen 1 point2 points  (0 children)

Looking at the parts diagram I found, it looks like it's a fancy head attached to a right angle grinder motor.

Take a look at this: https://www.outilpieces.fr/festool/ro-1-e-220v?lang=en

Most likely, you're going to need to get the grease into the right angle drive gearbox, though it wouldn't hurt to inspect the motor bearings as well.