Just a guess... I had a similar problem on a totally different printer. I thought that the bearings were bad, but after I disconnected the belts, the head slid beautifully. Turned out that the y-axis belts weren't set up parallel to the axis, so they were torquing the bearing as it slid.
Perhaps you have something similar happening? Look at the long belts that run front to back, and make sure that they run perfectly parallel with the axis rods. Particularly if the X-axis rods have moved at all (as some people's have), then the pulleys at either end of the y-belts might not be in the right place.
You might also check whether it could be actually the sound of the pulleys slipping on the rods, or the rods somehow catching on the frame.
As George said, a video would help.
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gr5 2,295
Don't know but someone else might:
1) Turn off your machine. With the power off try pushing the head back and forth in Y direction. It's safe to do this even when powered on but easier when the servos are off. Does it make the same noise? Or a similar noise?
2) Please take a short (10 second?) video of the issue so everyone can hear it.
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