Hi Christian,
refer to the service manual page 5-7 explosion drawing:
remove motor from the turntable by unscrewing from its 3 anker points and disconnect.
take off idler wheel (one thing less to worry about)
take off the cover – item 184
separate stator from the motor – item 177
remove motor bracket, held in position by 3 rods and secured by one nut – item 164
that frees up the rotor and its bottom bearing – item 178
remove and replace bearing with its oil-soaked felt ring after cleaning.
hope that gave some idea how to remove the bottom bearing
ALF