Results 1 to 7 of 7

Thread: E61 Head not Releasing Pressure

  1. #1
    Junior Member
    Join Date
    Dec 2011
    Posts
    2

    E61 Head not Releasing Pressure

    Gene Cafe Coffee Roaster $850 - Free Beans Free Freight
    Hi Guys,

    Just bought a used Isomac Zaffiro and have noticed that the E61 head is not releasing the pressure at the end of a shot or when back flushing using a blind filter (after blackflushing the pressure stayed at ~90PSI until i removed the portafilter and redecorated my floor with cleaner suds).

    There is also no noticeable delay for pre-infusion like there should be on an E61 machine.

    After brewing, water should come out the bottom of the grouphead, right?

    If anyone could advise me what the problem might be or how to fix it, id be very grateful.

    Cheers.

  2. #2
    enjoy black coffee JamesM's Avatar
    Join Date
    Nov 2008
    Location
    Perth
    Posts
    672

    Re: E61 Head not Releasing Pressure

    are you pushing the lever all the way down? Not resting it in the middle position?

  3. #3
    Member
    Join Date
    Sep 2010
    Posts
    46

    Re: E61 Head not Releasing Pressure

    Second hand, the group is simply blocked from lack of maintenance, specifically back-flushing. The group should be back flushed once a day with water, once a week with powder.

    Water is obviously making it to the portafilter, in the diagram water comes in from the top inlets (both when pressurised by the pump) down to the valve (in orange) up and then down to the portafilter.*
    When you release the handle, by pushing it all the way down, the orange cam valve pushes the plunger below it down opening the pressure relive valve, so this is where your blockage probably is.
    So what can you do about it?
    Get a blind filter, put cleaning powder in it, pressurise the head, and leave it. and keep trying this. The blockage may SLOWLY dissolve and start to release pressure.
    If not after lots of trying its going to need to be taken apart.
    Cheers Craig :)


  4. #4
    .
    Join Date
    Aug 2004
    Posts
    2,312

    Re: E61 Head not Releasing Pressure

    Welcome to CS healer :)

    Hmmmmm....Ill go with James on this one.

    If it was really that blocked up I wouldnt bother soaking, waste of time, I would go straight to manual disassembly to check.

    But until we are told otherwsie as stated Im with James....well spotted ;)

    Rgdz,
    A

  5. #5
    Junior Member
    Join Date
    Dec 2011
    Posts
    2

    Re: E61 Head not Releasing Pressure

    Quote Originally Posted by 765D51594F713C0 link=1323230346/1#1 date=1323234407
    are you pushing the lever all the way down? Not resting it in the middle position?
    Well that was mildly embarassing. Works like a charm.

    Thanks for the tip!

  6. #6
    Senior Member saoye's Avatar
    Join Date
    Jul 2011
    Location
    Adelaide
    Posts
    1,006

    Re: E61 Head not Releasing Pressure

    Sometimes the solution is staring us in the face but we focus too much on the problem. :)

  7. #7
    enjoy black coffee JamesM's Avatar
    Join Date
    Nov 2008
    Location
    Perth
    Posts
    672

    Re: E61 Head not Releasing Pressure

    Fully turn the lever all the way down once you want to cut your shot, to release the pressure quickly, somewhat ignoring the middle position.

    Some people pull the lever up to the middle position for a few seconds before commencing a shot to infuse the puck with water under no-pump pressure. Ive tried this but dont see any improvement in cup taste.

    Also be aware that chemical backflushing an E61 group will mean the removal of any lube on the cam and valves, as well as removal of coffee oils, resulting in a squeeky and possibly stiffer lever action. If you only brew once or twice a day I would only chem backflush every fortnight or month. Water backflush every day or two is good. (personal prefs) Might pay to get some appropiate lube/grease and re-grease the lever cam after a chem flush. Its really quick and easy to do and will increase the life of the valve stems. You only need to undo the larger of the bolts on the cam lever assembly (bolt closest to the group) and pull out the entire assembly. If you do, ensure you have the lever in the middle position at all times during removal and replace as this is the cams "idle" position (not under load/spring)

    enjoy!



Similar Threads

  1. Brew head pressure testing....
    By espressolover in forum Brewing Equipment - Pointy End ($1500-$3000)
    Replies: 2
    Last Post: 14th March 2013, 05:00 PM
  2. BZ40 - group head pressure not stable when adding water pressure limiter
    By pup26 in forum Brewing Equipment - Extreme Machines ($3000+)
    Replies: 4
    Last Post: 19th March 2012, 09:24 PM
  3. Em6910 - No pressure to group head
    By KiwiFrase in forum Brewing Equipment - Midrange ($500-$1500)
    Replies: 2
    Last Post: 7th March 2011, 09:50 AM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •