Whirlpool washers are equipped with a split type agitator. The top is called the "auger", the bottom is the agitator. To disassemble, follow these steps:
1. Remove the agitator center cap by either pulling straight up or gently placing a flat blade screwdriver into a slot located in the cap.
2. If the agitator is equipped with an inner cap with a handle, remove this as well by pulling straight up.
3. Remove the center bolt of the agitator.You will have either a 7/16” hex bolt or a recessed square plastic nut.If you have the square recessed type, use a 3/8” to ½” ratchet adapter to remove.
4. Remove the agitator by grasping the bottom flange and carefully pulling straight up.Try to keep all the parts assembled while doing this, so do not pull too hard.This will make this repair much easier.
If you have further questions, or need additional assistance please let me know. I hope this helps you.