Installed a new pump now I have problems - Millenium. - Page 2

August 29th, 2010, 6:56 pm

Hi,
Confirm pump is Ulka EX5 identical to the one removed.
One pressure gauge which is boiler pressure I believe. I have a portafilter pressure gauge assembled using some of the posts here.
Did the flow test at the hx end. Zero flow!
Thanks.

http://users.rcn.com/erics/ · #12: Post by **erics** » August 29th, 2010, 8:44 pm

Well, I suppose at this point I would try manually priming the pump with a turkey baster or the equivalent. It is entirely possible that the new pump has a sticking suction check valve inside. This is a small glass or plastic ball, spring loaded, as shown below:

Was the machine's check valve as I described - steel ball held closed with a spring?

August 29th, 2010, 9:51 pm

Confirm that check valve was as you described. ie. steel ball and spring.
So I remove the tube on the suction side and manually prime with baster.
Do I watch for flow at the hx or closer to the pump?

http://users.rcn.com/erics/ · #14: Post by **erics** » August 29th, 2010, 9:56 pm

Hx fitting first, then tighten same and look for flow at group. Prime the pump and then put suction line back in reservoir.

If you decide to take the pump apart, BE VERY CAREFUL as parts are easily lost.

August 30th, 2010, 8:03 am

Eric,
Good new is that I solved the problem. Turned out to be the priming valve that was causing the restriction. Replaced it and voila good flow rates everywhere.

Bad new is that I burned out the heating element when I was originally working on the pump (pre my first post).

Will have to order one tomorrow. It doesn't look to be such a big job?? I'll do a bit of research here in the next day or two.

Thanks for your help it was much appreciated.

http://users.rcn.com/erics/ · #16: Post by **erics** » August 30th, 2010, 9:07 am

The heating element is sealed to the boiler with an o-ring gasket so be sure to get one of those also. Lightly lubricate the o-ring with some food service grease.

The best tool to use when removing an element is an ADJUSTABLE impact wrench in conjunction with a 6-point socket.

August 30th, 2010, 7:36 pm

Just ordered the parts.
Thanks for the heads up on equipment.

August 31st, 2010, 12:54 am

Got myself a cheap impact wrench (AU$80).
The element came out with absolutely no hassle.
Suspect that this job would have been rather tricky without the impact wrench tip.
Thanks.

#19: Post by **DaveDixon** » February 12th, 2011, 12:32 am

Hey erics - thanks millions for the pump diagram. My Pavoni stopped pumping water and it turns out it was mineral buildup on the check ball in the pump. Your diagram enable me to take it apart and, much more importantly, put it back together! Back in the high life again!!