The Whirlpool W10837625 Drive Motor Pulley transfers motor rotation to the dryer drum for proper tumbling during drying cycles. This replacement pulley mounts on the dryer motor shaft and works with the drive belt to transfer rotational force to the drum. Proper pulley movement keeps the belt aligned and supports consistent drum rotation as clothes tumble. A worn, cracked, damaged, or loose pulley may cause belt slipping, unusual noise, slow drum movement, or a dryer drum that does not rotate properly.