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If the drive unit spins freely on the shaft, they should not be fused together, when fully assembled the shaft does not spin, the magnet spins on the shaft, then the motor is dead and needs to be replaced. Based on the pictures I would estimate the pump is from 2009, by late 2009 the disk was different and by mid 2010 the propeller was blue.
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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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