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The agitator is snapped into place over the number 310 part in the diagram at the link below.
Pull the agitator completely off and see if that bolt (number 301) is tight and the bell coupling (number 310) is securely fastened to the transmission shaft. If it is, the agitator may be worn and needs to be replaced if you push very firmly to lock it over the coupling and it still comes off. If those parts are not tight, tighten the blot. The agitator is available below if you should need to replace it.
The link below is to the part you will need from a highly recommended company rated A+ with the Better Business Bureau. They offer a 100% money back guarantee, EVEN ON INSTALLED ELECTRICAL PARTS, for an entire year! They are the only company to allow returns on installed parts for a refund and offer a FULL ONE YEAR WARRANTY!
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