Grundfos SEG 40

A new customer called me for the repair of a Grundfos SEG 40.

https://product-selection.grundfos.com/es/products/seg?tab=models

The person told me that another customer recommended me as the right person for this task. I’m always very happy and grateful when in matter of pump problems difficult to solve, my name pops up eheh.

We are specifically talking about a Grundfos SEG 40 26 grinder pump. Generally the problem of EVERY kind of grinder pump is that the cast iron cutting system get stuck by the oxidation,

so I just unblock, clean or replace the cutting system and reinstall, but this is not the case.

I generally install stainless steel grinder pumps but it’s not so easy to find it, especially with this power and features…

In this link you find my favourite domestic grinder pump:

https://headpumps.com/en/grinder-pump-installation-2/

Pump conditions analysis

The insulation values of this pump were very bad so I elevated the pump and brought it to my workshop to analyze the problem, that could be  related to the damaged motor or the damaged cable.

Dismounting the pump I noticed the lower ball bearing in very bad condition, clear sign of a countinuous work

the motor is completely overheated and shorted to ground. In the link you can see the failed insulation test:

https://youtube.com/shorts/hdVTYpFrQi4?si=8QlPuLG8SJMFDsxq

Next step will be winding of the motor and complete maintenance of the pump but most of all we are going to check the control box of the pump.

Customers generally wants to replace the pump quickly and forget about that, but if we don’t understand why the control box hasn’t stopped the pump before burning the motor, we can easily deal with the same problem in a few months.