Pull the machine out away from the wall, enough to tilt it back against the wall. The belt will walk off the large center pulley, as long as the motor will pivot inward. Try to turn the drain pump pulley by hand. It should turn freely, without resistance. If it grinds, and is hard to turn, replace it. Now, turn the large white pulley ond direction and have a friend see if the agitator is moving back and forth. turn it the other direction and see if the spinner (inner basket) spins. If you hear a grinding noise while trying to spin the spinner, pretty likely, the trouble is the thrust bearing is worn. (The thrust bearing helps release the brake for spinning.) A replacement thrust bearing kit includes a replacement pulley. If you're replacing any one of these components, also replace the belt.
Part number: AP4009132