I just received a LG Gas Dryer #DLG5988W that I just got in the shop yesterday - customer complained about the Dryer not working - it just HUMMS when you push the start button. My FIRST thought it might be a stuck sock in the blower motor chamber or something wrapped around motor. Pulled the front panel off and look what I found!!
Looks like the Throw Out Clutch Springs broke on the motor. One of the ears snapped holding the two pieces together for the throw out clutch. I just happen to have a BAD LG Motor with good clutch (EARS) that I just replaced 2 days ago I used to replace the part. CRAZY HOW YOU WANT TO THROW THINGS AWAY AND YOU WIND UP USING SOMETHING OFF IT. NOW IT WORKS PERFECTLY!!
Here are some pictures.