GRAINFATHER G30 Pump Recirculating Hum

Replacement Mag-Drive Pump

The magnetic drive pump's motor is attempting to spin the impeller, but internal resistance or a failed magnetic coupling is causing the stator to vibrate (hum) without torque. If cleaning the impeller does not resolve the issue, the magnetic strength of the rotor or the stator windings have likely degraded from heat or repeated stalling. Replacing the full assembly ensures the magnetic coupling threshold is restored to factory specifications.

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Pump Impeller and Shaft Kit

The impeller is the only moving part within the fluid path and is held by a ceramic shaft. A hum occurs when particulates like hop trub or grain particles wedge between the impeller and the housing, mechanically seizing the rotor. If the ceramic shaft is snapped or the impeller fins are scarred, the imbalance prevents the magnetic field from achieving rotation, necessitating a component-level replacement.

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Pump Filter (Silicon Mesh)

The G30 pump filter is the primary defense against debris entering the mag-drive chamber. If this filter is torn, improperly seated, or missing, the pump will inevitably ingest solids that cause the impeller to stall and hum. Replacing a compromised filter is the root-cause fix to prevent repeated mechanical seizure of the pumping mechanism.

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