Once you take off the front cover. You will see the impeller. Take of the rear cover and the shaft has a flat spot on it. You can hold it with a open ended wrench and spin off the impeller. It will be tight. There is no need to take it off unless it's broken.
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Once you take off the front cover. You will see the impeller. Take of the rear cover and the shaft has a flat spot on it. You can hold it with a open ended wrench and spin off the impeller. It will be tight. There is no need to take it off unless it's broken.