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  1. #1
    Junior Member
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    Nov 2020
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    UK
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    Help Please: Servicing an HX Rocket espresso machine. How can I include a video ??

    I think something's blocked in my Rocket espresso machine.
    It screeches and dumps water when brewing, so shots are taking longer.
    The screech is the same as I get when back-flushing.
    De-scaling does not seem to help.
    My machine is plumbed-in using filtered water.
    No-one in the UK seems interested in servicing, so a home repair is required unless I use it as an excuse to upgrade (but even that is difficult in a lock-down).
    So where should I start?
    Any help most gratefully accepted.

  2. #2
    Senior Member
    Join Date
    May 2014
    Location
    Kansas City
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    1,427
    Post a video first... hard to diagnose without hearing/seeing it...

  3. #3
    Junior Member
    Join Date
    Nov 2020
    Location
    UK
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    8
    Thanks.
    I'll do my best - that's something I've not done before...
    please be patient!

  4. #4
    Junior Member
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    Nov 2020
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    UK
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    how do I attach a .mov file from my computer?
    Last edited by rogher; 11-23-2020 at 07:26 AM. Reason: video not loaded

  5. #5
    Senior Member
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    You may not have enough posts to be able to do that.. upload it to youtube or vimeo and then post the link

  6. #6
    Junior Member
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    Nov 2020
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    UK
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    how's that?

    With a blanking dish inserted in the portafilter for backflush, the group head pressure rises from around 9 bar to 13 bar (in case that's significant).
    Last edited by rogher; 11-23-2020 at 02:41 PM.

  7. #7
    Senior Member
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    May 2014
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    Kansas City
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    1,427
    I spoke to a friend who is the local espresso machine tech... feedback:

    "That is a relief valve screaming, I would start by checking the pump pressure, it sounds like it is WAY too high blowing water out of the relief valve that is set to release at 12 bar. 9 bar is pump max. If not that, the relief valve needs to be tightened down".

  8. #8
    Junior Member
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    Nov 2020
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    UK
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    I'd agree with that logic.
    So how do I adjust the pump pressure?
    There is an adjustment for the relief valve under the machine, but I'm not aware of any means to change pump pressure...

  9. #9
    Senior Member
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    May 2014
    Location
    Kansas City
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    You don't mention themodel you are using - does it have a pressure gauge on it? What is it reading before and when pulling shot?

  10. #10
    Junior Member
    Join Date
    Nov 2020
    Location
    UK
    Posts
    8
    Group head pressure goes to 12.5 bar.
    I've tried reducing the pump pressure by releasing the nut on the bottom of my Rocket machine by six turns, but there was no change.

 

 
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