Grundfos (25-60) UFH pump - seized?

[Nozzle]

I have a grundfos UFH pump on a stand-alone manifold that hasn't been run in a few years - I suspect it might be seized. How might I go about breaking the crud up and running the pump to then sweep some cleaner through?

I've taken the cap off the end with a large slotted screwdriver and I can see the end of the rotor, but it's not an Allen cap on the end but some sort of 4 point asymetric head. I don't want to just grab it with some pliers as this would likely gash up the thread/sealing face for the cap I removed.

I note from the manufacturers manual that the 4 Allen bolts holiding the motor to the pump can be moved to re-orient the motor. However, being as there's CH fluid in behind the cap, there's a good chance it's supposed to be full of water, and therefore the flange with the 4 bolts has a sealing face (and I don't want to break this seal unless I have to)

Nozzle

 

[just pumps]

In the absence of the correct tool a suitable screwdriver or maybe an Allen key will get it rotating.

 

[Gasguru]

The pump shaft is brittle so if you mad at it it will shatter.
Drain or isolate and just take off the pump head. The sealing washer will be fine for re-use.
With patience you can normally unseize the pump.

 

[just pumps]

The pump shaft is brittle so if you mad at it it will shatter.

Thinking you better lay of the Shredded Wheat for breakfast mate.

 

[Nozzle]

Thanks for your feedback folks - I'll give it a go and report back when I get the time

Nozzle