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Possible UKLA pump issues
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Discussions > Espresso > Espresso Mods > Possible UKLA...  
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dshavers
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Joined: 28 Jun 2013
Posts: 23
Location: Alameda,CA
Expertise: Just starting

Espresso: Starbuck Barista
Posted Sun Sep 8, 2013, 2:12pm
Subject: Possible UKLA pump issues
 

Hello everyone, I was curious about the pump pressure that my little Starbucks Barista was making so I hooked up a portafilter gauge for the measurement. According to my gauge it shoots up to around 10bars and then slowly starts dropping down to around 8 before I shut down the pump. Theres a tiny bit of leakage from the fittings, and also the portafilter is the non pressurized version from seattle coffee company. No leakes around the portafilter.

Does this seem correct? or is the pump on its last leg? The pump model is a UKLA EAP5 52W

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D4F
Senior Member


Joined: 15 Mar 2012
Posts: 2,014
Location: USA
Expertise: I like coffee

Espresso: Gaggia Classic PID
Grinder: Baratza Forte-AP
Posted Sun Sep 8, 2013, 2:47pm
Subject: Re: Possible UKLA pump issues
 

Is there any pressure regulation, opv or other adjustment, or is that pump max?  What is the leak/flow rate?

 
D4F also at
http://www.gaggiausersgroup.com/
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dshavers
Senior Member


Joined: 28 Jun 2013
Posts: 23
Location: Alameda,CA
Expertise: Just starting

Espresso: Starbuck Barista
Posted Sun Sep 8, 2013, 2:52pm
Subject: Re: Possible UKLA pump issues
 

Hey Fred,

No Pressure regulation. I did have the dimmer hooked up before but disconnected it before reading the pressure. There is some kind of OPV valve in the system, but i'm not sure if it's adjustable. I'm assuming it tightened all the way in. I'm going to hook up a needle valve to the gauge to try and simulate an actual flow rate.



D4F Said:

Is there any pressure regulation, opv or other adjustment, or is that pump max?  What is the leak/flow rate?

Posted September 8, 2013 link

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D4F
Senior Member


Joined: 15 Mar 2012
Posts: 2,014
Location: USA
Expertise: I like coffee

Espresso: Gaggia Classic PID
Grinder: Baratza Forte-AP
Posted Sun Sep 8, 2013, 3:01pm
Subject: Re: Possible UKLA pump issues
 

Hi David,

Pressure may be factory regulated to say 11, though I do not know that.  You are leaking from somewhere, so catch that for 25 seconds from the first drip to see what it amounts to.  8 bar seems low for the pump, but just check the leak rate as I saw plenty of drips.  What is dripping?

 
D4F also at
http://www.gaggiausersgroup.com/
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dshavers
Senior Member


Joined: 28 Jun 2013
Posts: 23
Location: Alameda,CA
Expertise: Just starting

Espresso: Starbuck Barista
Posted Sun Sep 8, 2013, 3:16pm
Subject: Re: Possible UKLA pump issues
 

I'll try and maeasure that. I just tightened all my connections again and it gets up to 10 bar and the quickly falls. Keeps falling to around 7-6 bar. Something else I noticed is that the pumps gets pretty quiet during the drop as well. A new pump isn't that expensive and I could always try a deep clean of the parts if it sound to be failing. I just noticed this because the last couple of shots I pulled seemed to take a big longer and where struggling a bit with the same grind and tamp settings.
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D4F
Senior Member


Joined: 15 Mar 2012
Posts: 2,014
Location: USA
Expertise: I like coffee

Espresso: Gaggia Classic PID
Grinder: Baratza Forte-AP
Posted Sun Sep 8, 2013, 3:45pm
Subject: Re: Possible UKLA pump issues
 

My guess is a failing pump unless the leak flow is significant enough to relieve some pressure.  I doubt that it was set to 10 as it came with pressurized PF and would have been higher. The leaks need to be fixed or quantified to account for your brew.  Perhaps you could get lucky and leak at your desired brew rate.

 
D4F also at
http://www.gaggiausersgroup.com/
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dshavers
Senior Member


Joined: 28 Jun 2013
Posts: 23
Location: Alameda,CA
Expertise: Just starting

Espresso: Starbuck Barista
Posted Sun Sep 8, 2013, 3:51pm
Subject: Re: Possible UKLA pump issues
 

Yeah it kind of sounds like it. Possibly related to the voltage mod I did. Ugh. It doesn't leak during the brew, only when testing the pressure. I guess the only true way to tell is to get the brass fittings tight enough not to leak, and hook up a needle valve to simulate a shot. But the fact that the pump goes quieter is suspect. This machine has a valve in the group that once hits a certain pressure, opens up to I'm assuming 9-10 bars.
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D4F
Senior Member


Joined: 15 Mar 2012
Posts: 2,014
Location: USA
Expertise: I like coffee

Espresso: Gaggia Classic PID
Grinder: Baratza Forte-AP
Posted Sun Sep 8, 2013, 4:00pm
Subject: Re: Possible UKLA pump issues
 

My pump sound is different running as it is building pressure or open steam wand than against a brew or blind PF.  It still seems that your pressure is low and does not hold.  I cannot see how it would work if you had a pressurized PF that uses higher pressure.

 
D4F also at
http://www.gaggiausersgroup.com/
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iko
Senior Member


Joined: 30 Aug 2013
Posts: 58
Location: Toronto
Expertise: Just starting

Posted Sun Sep 8, 2013, 6:37pm
Subject: Re: Possible UKLA pump issues
 

I really don't think that a dimmer would damage the pump. However, the leaky connections could cause a large drop in pressure. I have experienced that while experimenting with my machine (an old Gaggia). The other possibility is that the OVP is set too low.

My pump also became a lot quieter when it reached 13bar with a blocked portafilter. Probably not a good idea to run the pump on max pressure for a long time (when it gets quiet).
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dshavers
Senior Member


Joined: 28 Jun 2013
Posts: 23
Location: Alameda,CA
Expertise: Just starting

Espresso: Starbuck Barista
Posted Sun Sep 8, 2013, 7:36pm
Subject: Re: Possible UKLA pump issues
 

Yeah me neither but I guess you never know. The pump is probably pretty old, and I got this machine off eBay, so god only knows its true lifespan.

Yeah the leaking from the brass fittings could be causing some of the loss. I need to tighten those fittings up, and get some more tape around them. I would expect the pressure to hold around 10 at least with minimal leakage.  The pump sounds fine without any pressure buildup.



iko Said:

I really don't think that a dimmer would damage the pump. However, the leaky connections could cause a large drop in pressure. I have experienced that while experimenting with my machine (an old Gaggia). The other possibility is that the OVP is set too low.

My pump also became a lot quieter when it reached 13bar with a blocked portafilter. Probably not a good idea to run the pump on max pressure for a long time (when it gets quiet).

Posted September 8, 2013 link

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