The part(s) or condition(s) listed below for the symptom Washer won't agitate are ordered from most likely to least likely to occur. Check or test each item, starting with the items at the top of the page.
The drive block connects the washer transmission to the agitator. If the drive block is worn out, the transmission shaft will still move back and forth, but the agitator will only move slightly or will not move at all. Inspect the drive block for damage. If the drive block is worn out, stripped, or damaged, replace it.
The drive motor might be defective. However, the drive motor is rarely at fault for this symptom. Before replacing the drive motor, first check all of the more commonly defective washer components. If none of those components are defective, consider replacing the drive motor. To determine if the drive motor is defective, first ensure that the motor is getting power. If the drive motor hums but doesn’t run, is noisy, or does not turn freely, replace it.
The agitator might be damaged or stripped away where it connects to the drive system inside. To determine if the agitator is stripped inside remove it from the washer and inspect for damage or wear.