Replacing a Grundfos pump

[ToughButterCup]

Here's what needs replacement.  Just checking that there isn't some hidden gottcha about them....

 

 

Thanks

Ian

 

[PeterW]

Good spray of WD40 on the stems of the isolator valves and when you reopen them, open full then back off 1/4 turn. 

 

And use pipe  pliers on the big nuts ..!

[Nickfromwales]

And the pump MUST lay perfectly flat or the front wet bearing will run dry and burn the pump out prematurely. The pic seems to show it slightly uphill. 

[ToughButterCup]

2 minutes ago, PeterW said:

Good spray of WD40 on the stems of the isolator valves and when you reopen them, [...]

 

I'd heard of the back off a 1/4 turn , but not WD40 on the isolators valves. I've just renewed the valves because the previous lot were seized solid - because I didn't know about using WD40  on them.... Hmmm.

 

Ya dunno whatcha dunno do ya? 

[ToughButterCup]

1 minute ago, Nickfromwales said:

And the pump MUST lay perfectly flat or the front wet bearing will run dry and burn the pump out prematurely. The pic seems to show it slightly uphill. 

 

There ya go! If anyone wants to know why I keep coming back to BH, here's the answer. 

Thanks Nick

Ian

[dpmiller]

that's why we read the instructions too!

[ToughButterCup]

Just now, dpmiller said:

that's why we read the instructions too!

 

Who is ' ...we...' in this case.

TBH I am more guilty than most of the opposite

[Nickfromwales]

7 minutes ago, dpmiller said:

that's why we read the instructions too!

NEVER!!!!!!!!

 

[ToughButterCup]

OK then boys... (sorry @lizzie, @Hecateh, @Moira Niedzwiecka and every other woman in the world ).....

 

How do you level a pump? Eh? Tell me that, now

[Declan52]

With a level.

[daiking]

51 minutes ago, recoveringacademic said:

OK then boys... (sorry @lizzie, @Hecateh, @Moira Niedzwiecka and every other woman in the world ).....

 

How do you level a pump? Eh? Tell me that, now

 

Jack up the left hand side of the house 

 

(Your left as you’re looking at the pump)

[Temp]

3 hours ago, Nickfromwales said:

And the pump MUST lay perfectly flat or the front wet bearing will run dry and burn the pump out prematurely. The pic seems to show it slightly uphill. 

 

+1

 

See page 27 of the installation manual... 

http://net.grundfos.com/Appl/ccmsservices/public/literature/filedata/Grundfosliterature-4609706.pdf

 

The shaft of the pump should be horizontal and it looks "tipped back" (possibly as much as 45 degrees) in the photo above.

 

 

Edited March 5, 2018 by Temp

[Nickfromwales]

2 hours ago, recoveringacademic said:

OK then boys... (sorry @lizzie, @Hecateh, @Moira Niedzwiecka and every other woman in the world ).....

 

How do you level a pump? Eh? Tell me that, now

Just rotate the wee beastie before finally tightening the nuts up. 

Simples. 

[Onoff]

And use a decent lubricating / pipe fitting compound I would, like (Jet Blue Plus) on the compression joints.

 

[Nickfromwales]

Don't get any on the flat mating surfaces of the pump or valves, ( where the rubber sealing washers press against ).