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« Last post by mash on it on September 11, 2023, 04:38:14 PM »
It sounds like A impeller territory.
I'd first check the wear ring to skirt clearance.
Some can be measured through the clean out inspection hole.
If it's waaay out, then pull the pump apart, inspect the impeller, and you can also see what size the impeller is.
Feeler gauges for checking the gap.
My last one was .050 per side, or .100 total.
Ideally, .012 per side o r.025 total is factory spec.
Dan'l