disassembling whirlpool dishwasher

we have a model number DU980QPDB3 and I am trying to figure out how to remove this shaft (here is a pic i took of it):
it's part number 24 on the "pump and motor parts" section of this page (I think)
http://www.appliancepartspros.com/partsearch/model.aspx?model_id &2213
Help would be greatly appreciated--thanks.
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