The most common cause is people overlook the upper bearing and it is cemented to the magnetic rotor by calcium. The upper bearing is part 3000.610, it sits at the bottom of the well.
Other causes could be a bad motor block or the driver having minor water damage or salt creep damage.
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Roger Vitko
Tunze USA
"He's for every one of us, stands for every one of us, he'll save every man, woman and child in a mighty Flash!"
Current Tank Info: 210 gallon planted tank with Altum Angelfish
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