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Ill-behaved Wega with probable pump failure
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Discussions > Espresso > Espresso Mods > Ill-behaved Wega...  
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CraigA
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CraigA
Joined: 19 Dec 2001
Posts: 11,264
Location: Rexdale, Toronto, Ontario, Canada.
Expertise: I live coffee

Espresso: PID/PressureMod 2001...
Grinder: BUNN FPG-2 DBC, Baratza...
Vac Pot: Bodum Santos manual, Yama 5...
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Roaster: Refurb Behmor 1600, BBQ...
Posted Mon Jun 23, 2008, 9:18pm
Subject: Re: Ill-behaved Wega with probable pump failure
 

proximityzero Said:

link to data table direct from Ulka here

Posted June 23, 2008 link

Yeah, I was just there..

 
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bobvilax2000
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Joined: 15 Apr 2005
Posts: 126
Location: Cincinnati, OH
Expertise: I love coffee

Espresso: Rotary Brewtus
Grinder: Macap MXK, Rocky
Drip: Swiss Gold One Cup
Roaster: Behm
Posted Tue Jun 24, 2008, 3:37am
Subject: Re: Ill-behaved Wega with probable pump failure
 

Fluid-O-Tech has a 70W pump that some consider quieter. I'd replace that opv, though.

Click Here (espressocare.com)

Excuse me, but what is the box to the right of the pump that feeds both the inlet and outlet of the pump? I've been trying to find a diagram to answer my question, but with no success.

- -Barrett
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proximityzero
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proximityzero
Joined: 12 Apr 2005
Posts: 184
Location: Dallas/Denton TX
Expertise: Pro Barista

Espresso: Wega Mini Nova
Grinder: Mazzer Super Jolly
Vac Pot: vac pots are for pretentious...
Drip: Capresso ST600
Roaster: Behmor 1600, homebuilt fluid...
Posted Tue Jun 24, 2008, 5:50am
Subject: Re: Ill-behaved Wega with probable pump failure
 

I don't have a real answer to that, as I am uncertain what role it plays overall. It seems to serve as a distribution block as well as housing the primary solenoid (visible behind block). It has lines that feed into the boiler inlet, HX inlet, and into the top of the boiler. The water inlet (3/8" commercial line) and pump inlet (clear teflon line) feed through it as well as the pump outlet line feeding into it. I've resisted the temptation to open it up and map the internals, mainly because  I assume if I do so, it will make the leaks worse. I'd imagine that part hasn't been made in at least a decade....

The pump, in this case, uses a threaded inlet instead of a barbed connection. Since it is low pressure, I can probably use a threaded/barbed connector to install it, but tempting to go with something other than the teflon hose with flared fitting, as it is (rather obviously) prone to leaking slightly over time. Just enough that it is undetectable with the cover off.
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proximityzero
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proximityzero
Joined: 12 Apr 2005
Posts: 184
Location: Dallas/Denton TX
Expertise: Pro Barista

Espresso: Wega Mini Nova
Grinder: Mazzer Super Jolly
Vac Pot: vac pots are for pretentious...
Drip: Capresso ST600
Roaster: Behmor 1600, homebuilt fluid...
Posted Tue Jun 24, 2008, 6:45pm
Subject: Re: Ill-behaved Wega with probable pump failure
 

Sorry if that came across as a memo from the department of the obvious, Craig, I just wanted to post the link for others following the conversation. Hope it didn't come across as an offense.
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CraigA
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CraigA
Joined: 19 Dec 2001
Posts: 11,264
Location: Rexdale, Toronto, Ontario, Canada.
Expertise: I live coffee

Espresso: PID/PressureMod 2001...
Grinder: BUNN FPG-2 DBC, Baratza...
Vac Pot: Bodum Santos manual, Yama 5...
Drip: Behmor BraZen, BUNN VPR-APS,...
Roaster: Refurb Behmor 1600, BBQ...
Posted Tue Jun 24, 2008, 6:52pm
Subject: Re: Ill-behaved Wega with probable pump failure
 

No, not at all Brad., the more info the better for all of us! {;-)  & I hope my flippant remark didn't offend you either. It wasn't meant to be, but it was late & I was beat..

 
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proximityzero
Senior Member
proximityzero
Joined: 12 Apr 2005
Posts: 184
Location: Dallas/Denton TX
Expertise: Pro Barista

Espresso: Wega Mini Nova
Grinder: Mazzer Super Jolly
Vac Pot: vac pots are for pretentious...
Drip: Capresso ST600
Roaster: Behmor 1600, homebuilt fluid...
Posted Thu Aug 14, 2008, 10:27am
Subject: Re: Ill-behaved Wega with probable pump failure
 

I've ordered the Ulka EAX5 along with new pump feet and a 1/8"BSP to barb fitting from Espressoparts. I expect to have it reassembled and leaking all over the place by this weekend. I would have replaced the teflon supply line brass fittings, but didn't see them in the ESP catalog. Stay tuned for updates. I will be waiting on the heatsink from a CNC machinist, but will assemble it in the meantime.
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proximityzero
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proximityzero
Joined: 12 Apr 2005
Posts: 184
Location: Dallas/Denton TX
Expertise: Pro Barista

Espresso: Wega Mini Nova
Grinder: Mazzer Super Jolly
Vac Pot: vac pots are for pretentious...
Drip: Capresso ST600
Roaster: Behmor 1600, homebuilt fluid...
Posted Fri Aug 15, 2008, 10:51pm
Subject: Re: Ill-behaved Wega with probable pump failure
 

Everything is now buttoned up. Unfortunately, contrary to what I had expected, the EAX5 shipped with a plastic barb fitting. Hopefully it won't be a problem, but I must admit to being a bit disappointed. The two lug wiring scheme threw me off a bit (it had a diode demarcation on the chassis), but it appears to be pumping, although I haven't run it against coffee to see how it will perform under pressure. Tomorrow morning will show the results of the repair.

proximityzero: schematic.jpg
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proximityzero
Senior Member
proximityzero
Joined: 12 Apr 2005
Posts: 184
Location: Dallas/Denton TX
Expertise: Pro Barista

Espresso: Wega Mini Nova
Grinder: Mazzer Super Jolly
Vac Pot: vac pots are for pretentious...
Drip: Capresso ST600
Roaster: Behmor 1600, homebuilt fluid...
Posted Fri Aug 15, 2008, 10:53pm
Subject: Re: Ill-behaved Wega with probable pump failure
 

I wanted to include this so that when people have this problem in the future, they will have an idea of how to go about it. Pay no attention to the filthy condition in the base of the machine. I'm not cleaning it until I'm certain its not going to leak like a sieve.

proximityzero: internals.jpg
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proximityzero
Senior Member
proximityzero
Joined: 12 Apr 2005
Posts: 184
Location: Dallas/Denton TX
Expertise: Pro Barista

Espresso: Wega Mini Nova
Grinder: Mazzer Super Jolly
Vac Pot: vac pots are for pretentious...
Drip: Capresso ST600
Roaster: Behmor 1600, homebuilt fluid...
Posted Sat Aug 16, 2008, 11:14pm
Subject: Re: Ill-behaved Wega with probable pump failure
 

Hypothesis: Pump has failed and requires replacement.

Action: Pump replaced with different model, with minor adaptation to fit plumbing in place.

Result: Espresso machine now fully functional. Grouphead output may be slightly higher than with previous pump. Ulka EAX5 pump (52W) is functional replacement for Vibropompe city pump, demonstrates significant reduction in pump noise.

Caveat: Ulka EAX5 has brass output fitting, plastic barbed inlet similar to other Ulka E series pumps.  I had expected brass fittings for both, but hope that the plastic (Nylon, I believe) will not develop leaks. The brass fitting that converts 1/8" BSP male to barbed type fitting changes inlet line geometry enough to strain the connector. This spot may be prone to leaks and will require further checking.

Outcome: functional Wega. Hypothesis proves true.

I'll try to update this post in a few months with the status of the upgrade.
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JonR10
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JonR10
Joined: 26 Apr 2004
Posts: 10,376
Location: Houston, Texas
Expertise: I love coffee

Espresso: E61 Legend, Livietta,...
Grinder: Robur, B-Vario-W
Vac Pot: Hario Tabletop, Yama...
Drip: Technivorm
Roaster: 1-lb US Roaster, Behmor 1600
Posted Sun Aug 17, 2008, 6:12am
Subject: Re: Ill-behaved Wega with probable pump failure
 

proximityzero Said:

Result: Espresso machine now fully functional.

Posted August 16, 2008 link

Good news!  I know how painful it can be without espresso....that's why I have at least one backup machine.  :-)


As for the pump and its end fittings, I seem to recall that Chris Coffee had the replacement with brass ends, you might check them out and you might even consider keeping a spare on hand.  I have found the vibe pumps to be less reliable than the rotary pumps.

 
Jon Rosenthal
Houston, TX
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