When a top-loading residential washing machine emits a loud buzzing, humming, or grinding noise during the wash cycle but fails to move or agitate the clothes, the malfunction is typically caused by stripped agitator dogs, a broken motor coupling, or a worn transmission shift actuator. In many direct-drive washers, a small plastic motor coupler shears apart when overloaded, allowing the motor to run while disconnecting power to the transmission. Alternatively, worn agitator dogs allow the transmission shaft to turn without rotating the agitator fins. You can troubleshoot mechanical engagement easily by checking tub movement. You can verify that your corrective action is successful when replacing sheared motor couplers or worn agitator dogs restores quiet, powerful clothes agitation.
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