The agitator bolt may be loose, or the dogs may need replaced. The following link explains how to access and repair:
http://www.fixya.com/support/r823955-replacing_agitator_dogs
You can view what agitator dogs look like at appliancepartspros.com. Just type in your model number and look for item 18 under the Agitator, Basket and Tub heading. A replacement kit only costs about $5. For a bit more, you can purchase the entire agitator repair kit for about $11 (item 22). The exploded view diagram can also assist you.
Your agitator has a cap that comes off the center post, followed by an air gap cap inside. The air gap cap just pulls out, exposing the agitator bolt. The upper portion of the agitator (called the "auger") will lift off once the bolt is removed.
NOTE: Make sure when you reassemble the agitator that you remember to reinsert the air gap cap and that the rubber o-ring gasket is intact. Without it, water will eventually work into the gearcase (transmission). Also make sure you do not overtighten the agitator bolt. Doing so may damage the agitator or restrict its movement. Tighten until snug.
If you have any questions, please let me know. I hope this helps you.
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