Hi Andy, depends which type you have.
The 300 series just have bronze and brass bushes as bearings.
These will need lubricating! The data sheet (see attached) says ensure components are well greased!
The 301 series have bronze and Delrin self lubricating bearings and the data sheet (see attached) says lubrication is unnecessary!
All info and data downloads are here
http://raboeschmodels.com/index.php/en/component/virtuemart/marine-accessories/propeller-shafts
Cheers Doug 😎