How long will this pump last

[Gary80gas]

I opened up a heating pump today. Jammed in a screwdriver and stopped it spinning without too much pressure. I know its not a good sign it should have tossed the screwdriver back at me. Its still circulating heating for a 10 rad system, what's happening inside pump and how long do you think its got?

 

[Harvest Fields]

How long is a piece of string is the honest answer mate. I have recommended new pumps when they have been like that and they have lasted another 2 years. Some 6 months.

 

[dancinplumba]

what do you call Too much pressure ?

 

[Last Plumber]

I opened up a heating pump today. Jammed in a screwdriver and stopped it spinning without too much pressure. I know its not a good sign it should have tossed the screwdriver back at me. Its still circulating heating for a 10 rad system, what's happening inside pump and how long do you think its got?

You will easily stop any domestic Circulator if you do that!!
They are only a small single phase motor.
What were you doing that for?

 

[ShaunCorbs]

You will easily stop any domestic Circulator if you do that!!
They are only a small single phase motor.
What were you doing that for?

Grundfos approved method of testing shouldn't stop but slow with pressure

 

[Last Plumber]

Grundfos approved method of testing shouldn't stop but slow with pressure

Well It's a daft way of telling someone to test anything in my opinion Shaun. Grundfos or not.
Just off the nature of the beast, any small single phase motor like those will stop if you apply enough pressure. It's only a magnetic field that gives the rotation. I suppose if you teach people exactly how much pressure in foot pounds or newton meters it should overcome at various speeds then ok but using a tool by hand will depend on how strong or heavy handed you are and where you jam the tool.

Sounds like Grundfos need to be a bit more Scientific lol.
I've never heard of this method in all my days.

Is this something they are teaching on courses now then??

 

[ShaunCorbs]

Yep they say use an old screwdriver and lightly push if you stop the pump the rotor is weak

 

[Gary80gas]

Thanks Shaun that's what ive been led to believe. You put a screwdriver with a bit of pressure on a good pump and it kicks the end of the driver around, no slowing and definitely not grinding to a halt. That's what a good pump should do.
I just don't understand the mechanics of a pump becoming weaker. There were some strange loud reported noises from the pump cupboard but the pump was quiet when I looked. Sounded like the motorised valve was slipping lots of repetitive whirring before stopping after a minute. So i'm going to change the valve and pump otherwise ill get a call on xmas eve.