Todd,
If you have an Oberdorfer 202M series pump, there is a small snap ring that holds the impeller on the shaft (product number CSOB_05_66 in our online catalog at moyermarine.com). You'll find a snap ring pliers in the Specialty Tools section of the catalog to assist in removing and reinstalling the snap ring. There is no reason that you should not be able to pull the impeller and shaft out of the pump other than possibly wear on the shaft.
Don
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