Worcester oil boiler pump & motor

[Gord]

Hi all new to the forum so please go easy on me hehe!!

I would like to know if any other engineers are having any problems with the simmel 70w motors and danfoss 41- L3 bio pumps for me they keep seizing up after working for aboiut 8 hrs or so,its the third time its happened to me.
Would be grateful for any ideas how to solve.
Many thanks Gord

 

[Best]

What exactly is happening? Are the pumps leaking oil past the shaft seal while running & getting into motor bearings?

 

[Gord]

Dont think so never had that on the other 2(different boilers by the way)only changed it this morning customer phoned to say its making the same sound as before meaning its siezed im wondering if its slightly out of line and i put a new coupling on.

 

[SimonG]

Not a R3 instead of a L3. Being a newbie, don't know your level of competence, so shooting in the dark.

Welcome to the forum

 

[Roger Welton]

Not had any problems, you have replaced the coupling with the right one? they look similar to the riello ones but are not interchangeable.

 

[SimonG]

Both pumps from the same source? Have you spoke to your source?

 

[Gord]

Haha if i could make R3 go backwards that would be great.
Correct coupling as all my riello couplings are white.
Yep checked with source only seems to be me.

Pumps set at correct pressure,oil is clean,thats why im a little at a loss apart from it being out of line maybe not sitting in motor properly!

 

[kimbo]

I had exactly the same problem and changed 3 pumps. It turned out to be the oil. I ran the boiler on a fresh supply of oil in a container via a temporary supply and it worked fine. You couldnt tell that thete was anything wrong wiyh it and it wasnt worth getting it analysed.

 

[Gord]

Thanks for replys
Going there today will update later.

 

[Bunker]

You sure they're seizing? Why is the coupler (dog) in question, it would either turn or not? Whats your symptoms?
You sure its not the motor or cap?
Oil pumps do feel a bit graunchy anyway.
Tell us more.