Product review (5 stars): Quality Part, So Easy to Replace
My LG washer model WM0642HW/01 had been making some odd noises for some time. Eventually the tub quit spinning altogether. I could hear some sound from the motor as though it was trying to spin the tub, but it was not moving. I watched a youtube video where this guy had the same problem, and it was very funny because this guy was verbally reproducing the exact sound my washing machine was making. When I watched the video, I knew instantly this was my problem, since my machine was making the same sound. The problem is caused by the plastic teeth on the rotor being stripped out. So when the motor turns, there are no teeth on the rotor for it to grab.  Eventually when it gets bad enough, your washer will quit spinning altogether.
This new rotor has metal teeth that shouldn't strip out like the old one did. The part was very well packaged.

The repair is really simple, quick and easy. There are some good videos on youtube that show how to do the repair.  Search for "lg rotor replacement".  You remove a few screws from the back panel of your washer and the back panel will come off. Then there is only one bolt which holds the rotor onto the washer. When I took mine apart, the single bolt holding the rotor on was really loose.

Before you bolt on the new rotor, be sure and apply some medium strength thread locking compound to the bolt. This will help prevent the bolt from coming lose over time. There are a number of different brands of thread locking compound, below are links to a couple on Amazon:

Permatex Medium Strength Thread Locking Compound:
https://www.amazon.com/Permatex-24200-Medium-Strength-Threadlocker/dp/B0002UEMZ2/ref=sr_1_1?ie=UTF8&qid=1506279413&sr=8-1&keywords=thread+locking+compound

Locktite Medium Strength Thread Locking Compound:
https://www.amazon.com/Loctite-37418-Strength-Threadlocker-6-milliliter/dp/B000FIXQXK/ref=dp_ob_image_hi