hub motor weird inner gear problem question


New member
Local time
10:22 PM
Dec 17, 2021
Hello, before opening my rear hub motor which is a part of the wheel,i wanted to ask your help with advice.
last time i open the motor i saw three outer gears co-rotating.

when i ride my bike,when i stop pedaling and the motor needs to stop working, i hear very hard gear grinding.
when i start pedaling again, the gear makes noise but start working no problem.

The most intresting happens when the motor stops working i just lift the back wheel hit it a little against the ground and the gears are fine working again.
What could cause cause this issue?
You can open up the wheel hub and see if you can find what is making the grinding sound. this video will give you a visual of what's inside the hub that could be making the noise:
here is another one: