2021 XCR Switchback 850
Take the secondary off, pop the seal, and fill the bearing with grease, replace the seal.I do most all of my own maintenance with exception of warranty work. Do you know of a video (You Tube?) that shows the way to do this on all of them?
While the secondary is off, loosen the track, take out the 6 Torx bolts holding the drive bearing cover plate on, pop the seal, and fill the bearing with grease. Replace the seal, and replace the bearing plate (There is a DOWN marker on it). Can be a little tricky by yourself, but without track tension, its doable.