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Hi LittleInch, You are right, i forgot to draw them, but they are there. In the photo: at the discharge of the pumps right before the shut-off valve of each pump. Sorry about that... As for the operating sequence, It cycles between each pump, trying to maintain the same amount of hours of use...

Hi artisi, yes i can isolate it, leaving the other 2 doing the work. Next week I'll take a look at it and pull it apart to have a peek inside. Will also look at the fan alignment and check valve imediatly at the discharge end (thanks Walt). I still need permission from the owner to pull it...

Photo of the setup https://files.engineering.com/getfile.aspx?folder=9ffc2913-d721-4b21-ba85-3afd1e4543b8&file=ABC.jpg

Quark - the video i posted is showing the pump working alone, I cut out the other 2 pumps while looking into this problem.

Image file with installation schematicshttps://files.engineering.com/getfile.aspx?folder=8e0bb77b-770f-4cdc-8eec-6aafd801320e&file=schematics_1.png

Video file: at 0:05 pump starts at 0:18 you hear a click sound - it's the pressure control shutting off a second pump (that's inactive because I wanted to isolate the sound of the pump in question). at 0:20 the pump shuts off and you can hear the sound...

Hi everybody, I have another file with better sound. I think I didn't choose my words right: it's not really a screeching sound, it's more of a "laser gun blast" kind of sound. It's pretty loud. In the new video I eliminated some background noise that's coming from a open water deposit...

Hi everybody, sorry for not responding, but i am currently dealing with a death in the family. I appreciate all inputs and promise to respond with more details tommorow. Thank you for your time and interest in helping out

Hi Quark, pump is running until 0:03, at 0:04 it stops and you can hear the noise I'm questioning about. Thanks!

Hi Itsmoked, I'm attaching the video with the sound I am asking about. It makes that loud sound when it turns off. Thanks for the feedback! https://files.engineering.com/getfile.aspx?folder=44e537cd-ce06-475c-9bfe-a131d82f09e6&file=20191227_104845_Trim.mp4

Artisi, I genuinely didn't take your response as a fob-off! Many times I have overlooked or not even remembered to do the simplest and obvious of things! So you are correct to start off with pointing me in that direction. Kind of like the " is the power on?" diagnostics when troubleshooting home...

Hi Artisi, i have sent the same question to them yesterday. But regardless, I would like to have opinions from the forum because I think that it will yield more valuable information on the causes and mitigation of the problem. There is nothing like getting information "from the horses mouth"...

Good Afternoon! I have just came from an installation where there is a Grundfos water pump (CR8)that makes a loud screeching sound when it turns off. Amp draw is OK 5,8 Amps on all 3 phases, pressure increase is normal compared to 2 other exact pumps that are in parallel, voltage across the 3...