Question about Bunn -o-Matic G3 (3 lb. Commercial Coffee Grinder)

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I have an 10 year old bunn 3g coffee grinder. I was wondering how I could clean and service and adjust the burrs.

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You will need a manual that has all the instructions for your machine, as this is too long a subject to answer here. The manual for your machine can be found at: http://www.bunn.com/pages/techdocs/manuals/grind.html

Posted on Feb 13, 2009

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I took off the grind settings knob on my Bunn G2 grinder... and now it won't grind!


oooooooooppppppppppsssssssssssssssss
you should not do this

the knob keeps two burrs together .The knob forces the screw (when you turn for grinding quality).
and adjust burrs far and close as needed
.reinstall it and turn the knob to the right until you feel tightness.Then,turn to the left 3 turns. and then adjust the grinding quality whatever you like .
thanks
please rate my work

Apr 27, 2011 | Bunn -o-Matic G2 (2 lb. Commercial Coffee...

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The grinder is able to spin, but gets very hot and heats up the coffee it is grinding. It seems to be jammed, though turing the motor on will still cause it to spin. The adjustment ring is set on the...


Relax and be patient, problem is evident and it can be solved. you will need one key for releasing oil filters(borrow from your mechanic but it is good to be 3 legged one)

Detection of problems:

  1. You have old burrs and they chew coffee, they don't cut grind any more. Because of that coffee is overheating = burning(after that you have very bitter espresso)
  2. Upper holder of burrs is jammed and it needs to be released and removed for cleaning.

Repairing:

Repairing 2=

  • Remove hose and dozer cover, jam the blocking pin in open position (to not block the burr holder), take the oil filter key and input it in burr holder, start moving left and right slowly
  • When you see that you can move the burr holder than check again blocker pin and roll against fine grinding, to release the holder. do not go more than quarter of revolution, you can break the block pin with filter key leg.
  • Replace the key and continue releasing
  • When you once get it out you should clean very around grinders and all the place from coffee.
  • Remove the block pin and the spring below it
  • Screw the holder in place and be sure it goes inn easy
  • NOW IF YOU HAVE NEW BURRS YOU CAN REPLACE THEM
  • In case you don't have than measure the diameter to be sure what you are asking for.
  • Assemble back the grinder and test it with old ones once(might be you set it too fine and that is the reason for burning)

PS. do not hesitate to ask me for further instructions' such is burr changing.

Dec 27, 2010 | Nemox Lux Electric Burr Grinder

1 Answer

I have a bunn coffee grinder that keeps on jamming up everytime you put coffee beans in it. I took the front part off to clean it out every time it jams,but it keeps on doing the same thing. The model bunn...


It sounds as though your grind is out of adjustment. The grinder is probably set too fine. I have not worked on a G3 grinder but I would think it is like the Bunn G2. On the front knob you will find 2 small set screws and one larger adjustment screw (in the middle of the knob)
1. Set the selector knob to finest setting (Espresso or Turkish)
2. Loosen the 2 set screws about 2 turns.
3. Activate the start switch (you must activate the "bag switch" behind the chute)
4. With the grinder running, SLOWLY turn the center screw clockwise only until you hear a very slight whirring sound (this is the burrs touching).
5. Then, back off the center screw counter-clockwise about 1/8 of a turn, shut off grinder and re-tighten the set screws.
Check the grind in the "drip" setting by running a few beans through... the grounds should be about the consistency of sand. You should get a better flow through the machine with the grind adjusted properly. You may want to check the cleanliness of the hopper in the top... I have seen these dirty enough to impede the falling of the beans to the grinder.
Also, whenever you remove (for cleaning) the 2 larger screws that hold on the front "plate", be sure to put them back in evenly... kind of like one would with a wheel on a car- Finger-tight then slightly tighten each on a little at a time (back and forth) until tight.
Hope this helps.

Oct 15, 2010 | Bunn Coffee Grinder

1 Answer

How to calibrate my Bunn grinder.


It would be easier to pick up the manual in the commercial section under products from bunn.com, rather than me explaining it.
You have to loosen the nut on the adjustment wheel, then pull out slightly and turn towards coarse a few numbers, then push back in and turn grinder on and slowly turn toward fine, until the burrs slightly touch, you will hear a little metal on metal, at that point turn the grinder off, back off about slightly, then pull out adjuster and turn it to Turkish and tighten screw.

Mar 13, 2010 | Bunn -o-Matic G3 (3 lb. Commercial Coffee...

1 Answer

Oily beans seem to have clogged our coffee grinder up. What can we do?


Rotate the bean hopper counter clockwise until it stops. Lift it off. Remove the outer burr with the 2 wings and clean under the burr. Clean the opening going to the chute for ground coffee(inside where the burr was).
Install the outer burr. Install the bean hopper. Rotate the bean hopper to the French press grind (coarsest) and operate the grinder. This will clean the burrs and the passages. If it starts to clog, repeat the last part to clean the burrs and passage. It must be grinding to go to a finer setting, but you can go to a coarser setting any time. Another thing. Turn the grinder upside down (empty) and rotate the bean hopper back and forth to clean the threads of the adjusting burr..

Dec 20, 2009 | Solis Maestro Electric Burr Grinder

1 Answer

Mini mazzer grind doesnt adjust


Can the silver collar turn? If yes then adjust, clean out all the grounds then grind for 3 secs, clean grounds then 10 secs(that will give you about 12-16 grams for a test shot). The 3 secs grind and clean is for the coffee that is already ground with the previous setting, there is still a small amount between the burrs and the chute.

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1 Answer

Severe clogging


Try using long grain white rice works better than minute rise, if that does not help, then the burrs need to be replaced on grinder.

May 12, 2009 | Breville Conical Burr Coffee Grinder -...

1 Answer

My Bunn Grinder sounds like it is jammed. I have power but no mov


First turn grinder to coarse setting and try grinding some white rice through it, that will clean out the coffee oils, if that does not work then the you will have to open the grinder and clean out the burr chamber and the spout for the grounds.

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You'll need to remove the hopper and grind out all the beans. Then, with the lock tab depressed (if it has one), unscrew the grind adjusting collar out of the body. Once it's out, there are three screws (sometimes only two) holding each burr. Remove screws and separate the burrs. Clean away!
Be very careful putting it back together so that you don't cross-thread the collar into the body. Clean threads can help this.
Good luck!

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