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Loud pump seems like this pump is too loud.

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You could have a worn pump bearing.

Posted on Nov 03, 2012


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Posted on Jan 02, 2017

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Grundfos MQ3-35 hums loudly and does not pump. Alarm light does not go on. Pump seems "happy" but when a tap opens and the pump turns on, there is no boost in pressure and the pump just hums loudly......


Pump probably runs dry, try to fill up the pump with water a few times and see what it gives. If the pump heats up then the rotor is turning but no water moves, pressure is not building up. Pressure switch is maybe faulty. If you have the possibility to connect a pressure gauge after the dicharge you can see if the pressure is building up or not.

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Drain Pump

If the dishwasher is loud during operation, the drain pump might be defective or might have some debris in it. This is a common problem.


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Circulation Pump

If the dishwasher is loud during operation, and the noise is a continuous drone similar in speed to the circulation pump sound, it's likely that the circulation pump motor bearings have failed. Once this happens the circulation pump will have to be replaced, the bearings are not repairable.





Drain Impeller

If the dishwasher is loud during operation, the drain impeller might be broken, or there might be debris in the pump. Generally, to gain access to the pump the top of the pump housing will have to be removed.





Pump and Motor Assembly

If the dishwasher is loud the motor bearings, drain impeller or wash impeller might have worn out. All three of these components are part of the pump and motor assembly. It may be possible to replace one of the impellers, but the motor bearings cannot be repaired. In that case the pump and motor assembly will need to be replaced.





Wash Impeller

The wash impeller is a small, plastic blade. The motor spins the impeller forcing water through the spray arms to clean the dishes. If one or more blades has broken off of the impeller the dishwasher is loud. The impeller can also scrape against the pump housing if it is damaged, warped or bent.





Circulation and Drain Pump Motor

If the dishwasher is loud during operation, and the noise is a continuous drone similar in speed to the motor sound, it's likely that the circulation and drain pump motor bearings have failed. Once this happens the motor will have to be replaced, the bearings are not repairable.





Water Inlet Valve

The water inlet valve is an electrically controlled water valve. When it is new, the water inlet valve is very quiet. Over time, the diaphragm inside the valve deteriorates and deforms. This deformation interacts with the water rushing in and can cause a loud vibration, buzzing, squealing or other noises. If the dishwasher is loud during the filling cycle, replacing the water inlet valve may solve the problem.

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Any warning lights on on the dash?

Oil pump working ok?
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you have posted your question under category "chain saws". Please repost under the pools and spas category so that the correct expert can assist you.

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Loud buzzing sound began on start up


It could be several things but the most likely are: Something is spinning around with the motor shaft. Unplug the motor and "blast" water through the vent holes to clear debris. Let it dry completely before returning to service. Something could be caught in the impeller. Remove the front end and check. Squeals, loud hums, heat and vibration are indications of bad bearings.

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there is the possibility there is trash caught in the impeller that is causing noisy operation.

Other than that, sometimes the pumps will run loud. Its usually a early sign of motor failure. Not much you can do there.

I would recommend you order a new pump and have it at least on standby. And be prepared, Hoshi is proud of their parts and it shows in the price.



In short, if theres nothing caught anywhere, let it roll til it dies and then replace it.

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If your motor is running and not the pump, the malfunction is either in the pump or the coupling between the motor and the pump.

Some of these compressors are manufactured so cheap now that there can be just a set screw that is loose and the motor shaft is spinning free inside of the crankshaft.

If you drain the oil out of the pump and take off the pump crankcase cover, you should be able to see the problem.


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Fisher-Paykel washer pump noise & some water left in tub


Lube the brass bearings on the motor. For some reason the bearing on the bottom nearest to the cooling fan will start to whine. I would guess because it's kicking dust up around the unit. I used a lube that will hold in place. Lube between the bracket that holds the motor together and by the fan. The noise should stop. I also suggest you lube the top bearing as well. The lube I recommend is a Silicone paste type.

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Fuel pump is loud and seems like engine is starved for fuel.


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