IMPORTANT: As of 7/17/2017 we have taken out the free technical support in order to offer a more competitive price. Consequently this kit NO LONGER includes technical support. Technical support with step-by-step repair help from the Doctor himself can be purchased for an additional $20 if needed.

This listing is for a set of O-rings for the Eugster Frismag brew group used in most Jura, Jura Capresso, and AEG Espresso machines and the oval head tool needed for some machines. These are the new improved red O-rings that Jura has been using since 2008 for the upper and lower piston of the brewing group. They are a direct factory replacement/improvement for the old black O-rings and are more service friendly thanks to only one size needed. (The black O-rings were less flexible and required you to use different sizes for the upper and lower piston).

The grease included in this kit is NSF/ANSI 51/61 certified and safe for use in food processing and in your coffee maker. Beware of equivalent kits using grease of unknown certification, origin, or freshness as it may not comply with United States food safety laws. The grease comes from a fresh batch with documented origin. Manufacturing batch# 0008806819 with a shelf life of 3-AUG-2021. Watch out for products of unknown origin or stale products - the grease in your brew group comes in direct contact with the coffee you're drinking.

The set contains:

  • One O-ring for upper piston (can be replaced without dismantling the brew group)
  • One O-ring for lower piston (brew group needs to be dismantled to replace this)
  • One O-ring for the lower piston water inlet pipe (this is the thinner of the two small O-rings. May be black or green in color.)
  • 10 general O-rings (this is the thicker of the small O-rings. May be black or red in color). One of these is used when servicing the drainage valve. The other is intended for the brew group water supply hose and the rest can be used anywhere else in the machine, for instance at the pump connection - a common source of leaks).
  • Two lip seals for the drainage valve (located on the bottom of the brew group)
  • Two O-rings for the raiser tube (located inside the upper piston).
  • Water tank lip seal (May be black or red in color).
  • One 6 gram bag of NSF 51/61 food grade silicon grease for lubricating the pistons and cylinder (date of expiration: 16-JUN-2020)
  • Oval head tool (stainless steel)

To our knowledge the O-rings will work for these machines. Please note that this list is not complete:

Jura/Capresso: E5, E7, E8, E9, E10, E25, E30, E40, E45, E50, E55, E60, E65, E70, E74, E75, E80, E85, ENA3, ENA4, ENA5, ENA9, F5, F50, F7, F70, F90, F9, XF50, XF70, S50, S55, S70, S75, S85, S90, S95, S7, S8, S9, C5, C9, C1000, C1300, C1500, C2000, C3000, J5, J6, J9, Z5, Z6, Z7, Z9, X30, X70, X90, X95, X5, X7, X9, Ultra, Cappuccinatore, M30, Scala, Scala Vario, Evolution, 201, 300, 401, 500, 601, 801, 2000, 3000, 4000, 5000, 6000
AEG Cafamosa: CF 80, CF 81, CF 85, CF 90, CF95, CF 100, CF 120, CF 200, CF 300, CF 400, CF 500

The O-rings ship with a 6g portion back of DOW 111 NSF51/61  food processing approved grease. (DOW 111 is the exact same compound as the OKS 1110 used in Europe when servicing Jura machines). The grease is used for lubricating the O-rings and the cylinder walls. By keeping the cylinder lubricated (relubricating every 6-12 months), these O-rings should last you up to 10 years or more. (The O-rings go bad when the lubricant wears off and they are run dry). The 6-gram pack of lubricant will last you a long time.

Instructions on how to open the S-series (C2000, C3000, S7, S8, S9, S9A, etc.): sgroup.pdf
Instructions on how to open the Z-series (Z5, Z6, etc.): z5bg.pdf

To replace O-rings in brew group:

  • Snap off the top cover (near the white gear) by gently prying it off in the corners.
  • Snap off the left and right cover. Each cover is attached with 4 tabs (note that one of the tabs is hidden).
  • Remove the two control arms and pay attention to the two metal bearings that will fall off. (Don't lose them!) 
  • Unscrew the white gear and note what side goes upwards for reinstallation (for instance use a black marker and put a dot on the side that faces upward).
  • Now the upper piston can be removed. Make a note of the orientation for reinstallation (it can be rotated 180 degrees and it may not be obvious what way it goes unless you make a note of it).
  • Change the O-ring on the upper piston. Remember to apply grease to the O-ring.
  • Optional: Unscrew the screw that holds the metal filter mesh in place and clean it. If the mesh is visibly dented or damaged you should consider replacing it since a dented filter may affect the ability to achieve a good crema. (Contact seller if you need a replacement).
  • Pull out the valve assembly (it slides out toward the bottom of the brew group) and replace the O-ring on the water inlet pipe. Note that it's the thinner of the two O-rings in the set that goes here. Again, remember to apply grease to the O-ring.
  • Remove the two 7mm locking rings on the bottom of the group and slide out the metal rod. (Sometimes the original alloy locking rings break. Don't panic - the brew group will work without them. Contact seller if you need stainless steel replacements).
  • Swing the bottom assembly with the gears to the side. Again, watch for two more bearings that will fall out!
  • Press the bottom and top part of the assembly together all the way to release the lower piston.
  • If you decide to remove the lower gear assembly for cleaning, pay attention to the orientation! It's easy to accidentally put it in the wrong way resulting in a non-working brew group. (If all coffee goes in the tray, this is probably what you've done wrong)
  • Replace O-ring, clean everything, apply fresh silicon grease to the O-ring and to the cylinder walls.
  • When reinserting the lower piston, make sure to press the gear assembly and the cylinder assembly (the brown parts) firmly together, then insert lower piston with a firm press engaging it into the gears.
  • Insert the steel rod (don't install the two locking washers yet). Install the two inner bearings.
  • Test the track movement and make sure the piston does not jam against the black plastic. If this happens, the piston was not properly installed, Go back and redo these steps.
  • Install locking washers.
  • Slide valve assembly into place.
  • Slide upper piston into place (make sure it's inserted in the correct orientation)
  • Screw on the white gear making sure to get the correct side upwards
  • Install outer bearing on one side, put control arm in place (rotate white gear to line things up), snap cover on. Do the same on the other side.
  • Snap on top cover. Test function (see note below). DONE!

IMPORTANT: Do not apply grease to the tracks where the four metal bearings run. These tracks must be clean and free of lubricant. This is important because the tracks are equipped with one-way feather stops, and if you grease the tracks the grease may cause the bearings to jump the stops and the brew group will malfunction. Grease should ONLY be applied to all O-rings and to the inside of the lower cylinder. Do NOT apply grease to any other parts. The plastic (Delrin) is self-lubricant. Applying grease to the mechanism will not do any good and results in coffee grounds and dirt getting stuck and eventually results in things gumming up.

BROKEN GEAR: A common problem with these brew groups is that the lower piston gear shaft comes loose. DO NOT GLUE IT! The material is Delrin (POM). Glue won't stick well and ruins the brew group by preventing proper future repair. The parts need to be chemically welded using Hexafluoracetonesesquihydrate or alternatively molten together (using an SMD hot air pencil works great). Contact seller if you have a broken gear that needs repair.

When testing the brewing group movement, ALWAYS turn the white gear fully in one direction until it stops and then turn it all the way in the other direction until it stops. Never change direction midway! Before installation, turn the gear counterclockwise all the way. Then clockwise until the brew group is in "coffee loading mode". (The cylinder is underneath the hole in the frame with the plunger in the bottom position, ready to be filled with coffee).

Shipping: In most cases your item will be shipped the same day if payment is received by noon eastern time (12 PM EST, 16:00 GMT Monday-Saturday). Items paid after this cutoff time may be shipped the next business day.
International customers: Please note that the default shipping is by First Class Mail. The US Postal Service does not guarantee timely delivery for this mail class, and although most shipments arrive within 7~14 days, on some occasions it has taken up to 30 days for international First Class Mail shipments to reach their destination. If you're in a hurry, please choose Priority Mail shipping!