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Check that the drive unit spins freely on the upper bearing, also check whether it has the older 6100.60 drive unit as this drive unit could sound an alarm if the brake shoes are loose or broken. Only the oldest waveboxes have this drive unit, usually the pump would be brown.
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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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