Stanley Range Help Needed!

[WHPES]

I was called out to a stanley which had the heating side stopped working. The pump was stiff, the rubber coupling shredded and the motor windings burnt. I have replaced all 3 but when I try to run it, the motor struggles to turn everything. (works fine when not coupled to the pump). It's one of those 2 solenoid pumps BFP 52 EL5. You get a very sooty flame and the motor seems to be struggling. It's as if something is causing resistance to the pump. I haven't checked anything between the pump and the nozzle yet, nor whether there is a voltage on either of the solenoid plugs yet. When the burner starts up for the first 2 seconds it runs at top speed then starts to labour and gives a very weak flame. The oil pressure is wobbling around on startup, around the 150psi mark. I haven't left running more than a few seconds as the motor gets very hot.

Any suggestions? Could it be a supply to one of the solenoids? Not have chance to study the instructions in detail yet.

 

[lame plumber]

fan jamming with dirt or mouse?

 

[WHPES]

No all runs freely. The problem occurs when you try to run the pump at operating speed

 

[lame plumber]

something is out of alignment probably

 

[Bunker]

2 things:
Check the bolts that hold the pump on, could well be over tight, that's my main suspicion. Also take the nozzle out and you can unscrew a check valve in the stem ( I think there's one in that one), take it out and check it for blockage.

 

[WHPES]

I called Ecoflam who advised me that they have been having this problem recently with the type of pump in question and I had been supplied with a faulty replacement pump. Another new pump from a different batch and the boiler was working fine.