I got duct seal at Menards in the electrical department. Lowes or Home Depot may have it. It's used for sealing up conduit in a box. You just work it...
Is that robot using vision to determine which bin to place the different types of trash? I noticed that when each pile of trash was moved that there...
If your motor ohms out o.k. the other thing to check would be the incoming voltage to the motor. I've seen the condition the electricians would call...