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Author Topic: deep well pump  (Read 1286 times)
billi
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« on: September 25, 2018, 06:44:05 PM »

Hi,

I have a Grundfos deep well pump  similar or exactly built like the attached picture

It was out of the water for a few years .....  and i tried to use it today , but only gave a humming sound untill the house fuese turned off ,  the rotor/shaft  is not turning .... not sure if the motor or the pumpwheel is stuck , but asume they are directly connected ....

I  think i can get access to the shaft by removing a cover over it  and try  to loosen/turn  the shaft with a plier   whistlie

Any thoughts ?

Regards Billi


* 3gdfe7tt.jpg (181.71 KB, 533x798 - viewed 248 times.)
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offthegridandy
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« Reply #1 on: September 25, 2018, 08:24:13 PM »

I'd have thought it more likely to be siezed  at the pump end than the motor. But either way if you can access the end of the shaft you can try a gentle twist, if nothing will move you could try soaking the pump, it might soften up internal sediment from previous use.

Andy
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Philip R
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« Reply #2 on: September 25, 2018, 08:43:51 PM »

I am concerned that it was powerred up long enough to trip off the mains supply. It Hummed because the motor was overloaded. You may have cooked the stator windings.

Looking at the cutaway drawing, I would think that the motor should be able to be removed from the pump. the coupling may have a compliant polymer insert between the drive and driven  coupling segments. With them seperated, ascertain if the motor or pump is seized. My guess is that the multistage pump has corroded up inside.

Turn the coupling but don't mash the shaft with gland pliers or whatever. Otherwise Grundfoss will not even consider mending it for you.

Philip R

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« Reply #3 on: September 25, 2018, 08:46:48 PM »

The motor end is oil filled (to stop water getting in under pressure) so its the impellers that are stuck. just pour some oily diesel down the top end and wait a bit and then try again. Pumps always get stuck if you dont use them.
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oliver90owner
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« Reply #4 on: September 25, 2018, 08:55:48 PM »

It is a multi-stage pump.  Depends which end is seized as to whether soaking will free it off.  Coca-cola (dilute phosphoric acid) was often used to free off rusted engines, so might clean out/loosen any sedimant in some of the stages.  Good luck, if it was turned on for several seconds....
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billi
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« Reply #5 on: September 25, 2018, 09:30:29 PM »

ok , good advice , thanks ,  will soak it  and try gently to turn the shaft ....
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« Reply #6 on: September 26, 2018, 12:28:12 PM »

Well sorted  extrahappy  ,shaft is turning  , it was  a coroded connection to the condensator ...
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1.6 kw and 2.4 kw   PV array  , Outback MX 60 and FM80 charge controller  ,24 volt 1600 AH Battery ,6 Kw Victron inverter charger, 1.1 kw high head hydro turbine as a back up generator , 5 kw woodburner, 36 solar tubes with 360 l water tank, 1.6 kw  windturbine
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