take the retain clip off
I just OH my Oberdorfer pump and you have to take the retain clip off to change the impeller. Use a fresh gasket when assembling DON’T use the old one IT WILL LEAK.
Remember to put the drain plug back in the bottom of the pump. Trust me it fills your billage up in less than 5 minutes if you don’t. A dumb mistake on my part. That took all day to find. Get yourself a long extension bolt for the bottom bolt ,you won’t regret it.
Uwe
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