Whirlpool has a split agitator design. The upper portion is called the auger, while the bottom is called the agitator. Between these components is a agitator cam assembly. This problem is commonly caused by worn agitator dogs or the agitator cam assembly. The following link explains what the dogs are and how to replace them:
http://www.fixya.com/support/r3608577-replacing_agitator_dogsThe part number is included in the link provided. You can purchase replacements at pcappliancerepair.com for about $5. For a little more you can purchase the entire cam replacement kit, which includes the cam, the thrust bearing, and the dogs for about $11 or $12.
IMPORTANT NOTE: The model number you have this question listed under did not have the split agitator design. It used a single piece agitator with a center post cap installed. If you need further assistance in identifying parts, please post back with your complete model number (located along the wash tub rim under the lid).
NOTE: You can refer to the excellent exploded view parts diagrams the web site has to offer for assistance. Whirlpool also recommends the application of a little grease on the thrust washer. The part number for their recommended grease is AP3098553.
If you have any questions about this repair, please let me know. I hope this helps you.
NOTE: DO NOT overtighten the agitator bolt. This can cause damage to the plastic, or restrict the agitator movement. Tighten until snug only.
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