Some manuals recommend changing the impeller annually if the motor sees a lot of run time or is operated in silty water. For occasional use this might be a bit too often but it does give the owner peace of mind. Most of my motors get little if any use but they always get a fresh impeller and wear plate or housing when bringing them back to life.
Some of these impellers were in motors I had running for maybe ten minutes before checking them. The motors had sat for years and the impellers weren’t in bad condition except for taking a set and breaking up on startup but they probably worked great the last time they were used.
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