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LM GS/3 Paddle Group Pressure Profiling

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  • LM GS/3 Paddle Group Pressure Profiling

    A few weeks ago I mentioned in another thread that you can pressure profile with a LM GS/3 MP in reply to someone who said you can't, a few people since have asked how. Its pretty simple, the GS/3 MP group is the same as a Strada MP group minus the brew pressure gauge that reads the brew pressure above the puck after the Gigleur. Although it isn't true pressure profiling in a sense as the pressure curve isn't all that smooth but it's easily workable especially at home. Originally i wanted to do it so I could pre-infuse as i couldn't get 3 bar of line pressure, which i found the cause of later when installing the gauge and reseating the microswitch, at factory LM kicked the pump in to early on my machine. Thats irrelevant now and if i wanted to run it on tank in the future i can now pre-infuse without line pressure. It's also quite cool to see how some coffee's react at different pressures, Ive found that the Ethiopian Harrar that I love tastes more fruitier and sweeter at 8 bar with a slight pre-brew at 4 bar. Anyway its quite a simple install (if you can service your group you can already do this). I love to play around with anything I can these days as i was an engineer and now an artist.
    Attached Files
    Last edited by micksquires; 27 July 2012, 11:25 PM.

  • #2
    hi,
    can you post step by step and what the different if you compare with LM Strada MP?

    cheers....

    Comment


    • #3
      Nice work Mick!

      I shudder to think what you paid for those parts... the plunger alone is worth a few hunge retail! The Strada bits are a nice refinement to the LM paddle group which is already a thing of beauty.

      I'd be interested in a video comparing the system pressure and the group pressure during an extraction, if you can be bothered. Would be keen to see the ramp-up after the gicleur.

      Comment


      • #4
        I thought about trying to explain how to do this but putting all the processes in writing would be a massive task. I have a better way, La Marzocco have a youtube clip on how to service your MP (Manual Paddle) group. Most of the steps required are what you need to do when replacing the O-Rings in the group when servicing. So I've listed what sections/steps of the youtube clip that are required to install the Manometer. Ive also listed the parts required plus detailed the extra steps that the clip wont cover.

        A.5.010 SHAFT FOR PADDLE STRADA MP

        F.1.020.MP GROUP PROTECTIVE COVER X PADDLE

        E.3.009 VERTICLE GAUGE FOR PADDLE

        H.1.021 EPDM O-ring 103 (or2018)

        A.2.018 VERTICAL MANOMETER NUT

        A.2.019 VERTICAL MANOMETER FITTING

        H.1.020 EPDM O-Ring 3024



        Please make sure water and power are off before trying any of this..

        Also lube all o-rings with an appropriate grease before installing.

        Mechanical Paddle Service Guide - YouTube


        *First up you need to start the clip ^ ^ ^ and watch up to 1:06 for the disassembly process.

        *Next step Flip Microswitch on the group around, the switch control the pump activation. You flip the switch around because you want the pump to kick in early before the valve opens. You also need to disconnect the red wire and cap it off and connect the loose white wire that wasn't connected. Connect it to the connector that the red wire was connected to (you'll know what im talking about when its in front of you) this switches the function of the microswitch for activation of the pump.

        *Start watching again from 3:29 Thru to 4:28 ***Note instead of the Blue Shaft that is re-insterted, use part No A.5.01

        *Next step is to screw part no. A.2.019 (with H.1.020 installed) into the thread of the new shaft. ***Note this part needs to be lined up correctly as it slides through the group cover.

        *Slide the new group cover on (F.1.020.MP)

        * Install o-ring H.1.021 and thread part no. A.2.018 onto the manometer (gauge)

        *Screw the manometer onto the fitting sticking out of the group cover, screw it all the way down and lock it down with the manometer nut that you previously installed on the gauge.

        Your done!


        **Im not taking any responsibility for anyone trying this
        Last edited by micksquires; 28 July 2012, 11:47 PM.

        Comment


        • #5
          Originally posted by rick_bond View Post
          Nice work Mick!

          I shudder to think what you paid for those parts... the plunger alone is worth a few hunge retail! The Strada bits are a nice refinement to the LM paddle group which is already a thing of beauty.

          I'd be interested in a video comparing the system pressure and the group pressure during an extraction, if you can be bothered. Would be keen to see the ramp-up after the gicleur.
          Yeah mate the parts weren't that cheap, obtaining those parts was a mission though, the shaft is worth $230 I think.. If you have access to the lathe, you could drill your existing shaft and tap a thread into it quite easily. Thats the only difference between the two.
          The group gauge and the system gauge are actually the same pressure when the pump is fully activated and a correctly loaded puck is being brewed due to the group being fully saturated but its quite cool to see what happens to the pressure at the group when its under extracting its drops a bit due to there not being enough resistance from the grounds. Also during ramp up is pretty cool to see whats going on. I'll record a video tomorrow for you. Ive also checked with a Scace II device to see if the reading are the same on the group gauge and the device. They do read the same.

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          • #6
            All done mate, theres no difference between what ive done and a Strada MP group. They react exactly the same..

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            • #7
              I must say I was surprised when I saw where the brew gauge was on the MP Strada, as it sits directly above the group it could quite easily get clogged up with coffee solids. No reports of stuck gauges yet, but time will tell.

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              • #8
                I know this has nothing to do with it, but geez Mick... You've gone from a Breville combo, to a minore db, to a LM GS3 paddle. Plus not to mention every mazzer ever made.. And all since January... Lol That's awesome

                Comment


                • #9
                  Originally posted by rick_bond View Post
                  I must say I was surprised when I saw where the brew gauge was on the MP Strada, as it sits directly above the group it could quite easily get clogged up with coffee solids. No reports of stuck gauges yet, but time will tell.
                  Rick how many Strada MP's have you guys put out there or service? Ive pulled the gauge off a couple times to see if there is any solids build up but there doesn't seem to be any so far. I'll post that video up tomorrow when i get a chance

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                  • #10
                    Mick, exactly none to my knowledge. Most Strada purchasers go for the EP and consider that the only one worth having, which is a little misguided I think.

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                    • #11
                      Originally posted by wonder View Post
                      I know this has nothing to do with it, but geez Mick... You've gone from a Breville combo, to a minore db, to a LM GS3 paddle. Plus not to mention every mazzer ever made.. And all since January... Lol That's awesome
                      Haha yeah I've gone a little out a control, i had the opportunity to get the GS3 at an amazing price, why not. I'm actually living in my first real home in about 5 years, I've spent the past few years living/working in and out of a suitcase all over the globe.

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                      • #12
                        I need to convince my wife to give up the cabinet above the LM/3 because that gauge stick up a bit to far to open that door.... Darn
                        Attached Files

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                        • #13
                          Oh, and contrary to what I wrote above, Veneziano First Pour in Bond st. put in a 3 group strada MP recently.

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                          • #14
                            Mick:

                            How far above the paddle does the gauge stick up? I would appreciate knowing that height.

                            I really would like to do this MOD and I have the group rebuild kit and tool so the Strada parts are the only stuff I need now.

                            BTW, where did you get those cool glass end panels?

                            Thanks for your time in writing up this fine explanation

                            Stephen

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                            • #15
                              you could also use a male to female elbow fitting and turn the gauge 90 degrees to the right if you really need to. It would look a little odd, but work just as well.

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