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Gaggia Classic Pump Stalling During Extraction
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SJM
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Posted Mon Jan 20, 2014, 9:05am
Subject: Re: Gaggia Classic Pump Stalling During Extraction
 

James, you are going to have to take it apart anyway to install a new pump, so what you learn about your machine doing the Water Debit Test will just be preparation.  And, it just might save you the cost of the new pump.

It is certainly possible that your pump is kaput.  And you have one one the way.  All that is good.  But, from my brief 6-7 years of fielding questions at the Gaggia Users Group, the culprit has almost never been the pump and almost always been something blocking the flow after the pump.  The OPV?  The 3-way solenoid? The boiler itself?  All of these are potential areas of restriction to the flow being provided by the pump.  If the pump IS doing it's job, you will then have to take apart those other bits and pieces, so....

I highly recommend having a camera at hand to document every bit as you start dismantling.  It helps a lot when you want to put something back and you've forgotten exactly where it goes.

Susan
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JamesR
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Location: Dublin, Ireland
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Posted Mon Jan 20, 2014, 9:15am
Subject: Re: Gaggia Classic Pump Stalling During Extraction
 

Thanks Susan, I'll be sure to photo and keep track of each part as I go. I don't suppose you know of any online video tutorials on dismantling the machine that might help? I have the exploded parts diagram so I'll start with that.
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SJM
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Location: CA
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Posted Mon Jan 20, 2014, 9:25am
Subject: Re: Gaggia Classic Pump Stalling During Extraction
 

I could do a search for what you need, but ....so can you.
Check in the Reference Library at http://www.gaggiausersgroup.com/index.php

If it's not in the library, I think a general search or an inquiry will steer you in the right direction.
And....
I will be paying attention if you post pictures and questions either here or there.

Susan
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SJM
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Location: CA
Expertise: I love coffee

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Posted Mon Jan 20, 2014, 9:40am
Subject: Re: Gaggia Classic Pump Stalling During Extraction
 

Here, by the way is an interesting read on how (and how long) an Ulka pump works.  
http://coffeegeek.com/forums/espresso/machines/656005

I have bookmarked it so I can re-read it myself :-))))

Susan
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SJM
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Joined: 17 Nov 2004
Posts: 1,724
Location: CA
Expertise: I love coffee

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Roaster: HotTop   Huky en route
Posted Mon Jan 20, 2014, 12:42pm
Subject: Re: Gaggia Classic Pump Stalling During Extraction
 

And here is another good read on the way to understanding/fixing/replacing your pump:

Click Here (ulkapumprepair.blogspot.com)
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SJM
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Joined: 17 Nov 2004
Posts: 1,724
Location: CA
Expertise: I love coffee

Espresso: SAMA (2), Maximatic, Cremina...
Grinder: K-10PB, Rancilio MD-50
Vac Pot: no like
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Posted Mon Jan 20, 2014, 1:04pm
Subject: Re: Gaggia Classic Pump Stalling During Extraction
 

And lastly until we hear back from you, here is the text of the "Water Debit Test"

To test the pumpís effectiveness, ..disconnect the high pressure tube between the pump and boiler at
the pump. I then slip a piece of plastic tubing over the output and clip it in place so no water can leak
onto the electrics.
Place the unattached end in a graduated measuring cup, then turn the pump on and measure the
output: If itís less than 100 milliliters in 15 seconds the pump is bad, but maybe not irrevocably.
If your pump is sluggish, try descaling it by dissolving 2 tablespoons of citric acid in 2 cups of water. Place
the input and output tubes in the container, and switch the pump on for 30 seconds followed by a 60
second wait period. Repeat the on/off cycle 30 Ė 40 times, and then repeat the water debit test. If
thereís no noticeable improvement, then assume the pump is beyond salvage and replace it.
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JamesR
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Joined: 16 Jan 2014
Posts: 44
Location: Dublin, Ireland
Expertise: I love coffee

Posted Mon Jan 20, 2014, 1:33pm
Subject: Re: Gaggia Classic Pump Stalling During Extraction
 

SJM Said:

And lastly until we hear back from you, here is the text of the "Water Debit Test"

To test the pumpís effectiveness, ..disconnect the high pressure tube between the pump and boiler at
the pump. I then slip a piece of plastic tubing over the output and clip it in place so no water can leak
onto the electrics.
Place the unattached end in a graduated measuring cup, then turn the pump on and measure the
output: If itís less than 100 milliliters in 15 seconds the pump is bad, but maybe not irrevocably.
If your pump is sluggish, try descaling it by dissolving 2 tablespoons of citric acid in 2 cups of water. Place
the input and output tubes in the container, and switch the pump on for 30 seconds followed by a 60
second wait period. Repeat the on/off cycle 30 Ė 40 times, and then repeat the water debit test. If
thereís no noticeable improvement, then assume the pump is beyond salvage and replace it.

Posted January 20, 2014 link

Thanks a million for all of the links Susan, I've some serious reading to do!!! Will report back here with my progress.

:-D
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JamesR
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Joined: 16 Jan 2014
Posts: 44
Location: Dublin, Ireland
Expertise: I love coffee

Posted Tue Jan 28, 2014, 5:43am
Subject: Re: Gaggia Classic Pump Stalling During Extraction
 

Update:

Pump arrived yesterday so ran the water debit test today. Not too sure how to post images directly into posts so here are some links:

Tools used (I used the tube from my hydration backpack):
http://www.zoost.ie/coffee/debit-test-tools.jpg

Setup:
http://www.zoost.ie/coffee/debit-test-setup.jpg

Result after 12 seconds:
http://www.zoost.ie/coffee/debit-test-results-12-seconds.jpg

So does this suggest my pump's fine and the issue is further along the line? solenoid valve?

Thanks,
James
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SJM
Senior Member


Joined: 17 Nov 2004
Posts: 1,724
Location: CA
Expertise: I love coffee

Espresso: SAMA (2), Maximatic, Cremina...
Grinder: K-10PB, Rancilio MD-50
Vac Pot: no like
Drip: no like
Roaster: HotTop   Huky en route
Posted Tue Jan 28, 2014, 8:40am
Subject: Re: Gaggia Classic Pump Stalling During Extraction
 

Nice work and excellent reporting !!!!

With that output in that time, I'd say it is very unlikely that what is wrong is your pump.  
Certainly we know that it is working;  it is still possible that it isn't working well enough, but I don't know how to prove that until you rule out all of the possible issues after the pump and before the brew group.

Good work.
Very likely you have saved yourself the cost of a new pump.

Susan
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JamesR
Senior Member


Joined: 16 Jan 2014
Posts: 44
Location: Dublin, Ireland
Expertise: I love coffee

Posted Tue Jan 28, 2014, 9:14am
Subject: Re: Gaggia Classic Pump Stalling During Extraction
 

Thanks Susan!

So my pump could be good, that's good news. Where should I test next? 3-way valve?
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