Most likely then the motor is going bad, unless the disk 3005.740 is upside down or missing, it really is the only remaining possibility. How old is this pump? Repair would be by replacement of motor block 6105.100.
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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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