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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Posted on Jan 02, 2017

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Bunn g3 commercial grinder


Humm, G-3 grinders. Okay what common problems I've come across:
* Wrong setting for grind on label. Usually means worn out grinder burrs. But this does not happen often unless you are using it to grind commercial amounts of coffee? It's a retail level grinder meant to be user friendly and simple to use. Say grind a bag of beans once every 10 mins or so even with customers lined up to grind there own. Running a G-3 constantly is usually done by upcoming coffee vendors whom are using it for small flavored bean batches. But expect the burr plates to only last 3 to 6 months. We used to change it every month till the boss bought a bigger pro grinder. (whew!)
* Out of calibration (for grind) This usually happens as soon as it's installed. Either the grinder got banged (Dropped?) around or the lock nut was not tighten down. If caught quickly then it's a simple adjustment. Left unchecked will wear out the burrs or crack the plate.
* Trips out breaker. This is common at retail stores as it's located in a shelf rack that really does not have the required outlets. Many times there is a brewer(s) connected to the same line. It only trips out when one or both brewers are heating and the grinder is running a very fine grind.
* Trips out breaker when grinding espresso or very fine grinds. Worn burrs or slim chance the grinder was miss calibrated (but you would catch this when first installed)
* Shocks the customer. Dry climates or heavy air conditioning will build up static electricity at the chute. There usually a small chain attached to the chute to prevent this. Attach a SHORT metal chain or thin cable to the metal case of the grinder and add a metal clip to attach to the coffee bag. Many use a chain and clip just short enough to keep the bag positioned under the chute. Note many coffee bags come with bag clips. Just make sure the clip and chain can't get stuck in the grinder.
* Not working. This is usually the on/off switch as it gets beat up the most. There is sometimes a safety micro switch under the chute to sense if there is a bag there. I've found may have been defeated.
* No power, check cord, breaker (GFRI) outlet, Plug prongs if broken off or bent.
* power but no motor hum. Tripped thermal breaker (usually a red button on side or back. Some models may have it inside on the motor itself. Call for service to check.
* Turns on but loud hum (may be hot too). Burrs stuck. This could be from adjusting grinder while grinding beans and adjusting to a fine setting. Grinding finer slows down the beans feeding the burrs. Large settings flood the burrs with a lot of beans. Adjustments are usually done when the grinder hopper is completely empty. If loaded and turned down from coarse to fine grind the beans already in the burrs get crushed and stuck between the plates thus locking them in. It may be possible to clear the hopper and open up the grinder to its coarsest setting to jog out the crushed beans. Otherwise call for service to have the burrs cleared manually.
*Finally check with your vendor if your still having problems.

Aloha! ukeboy57

Mar 22, 2017 | Bunn Coffee Makers & Espresso Machines

1 Answer

I don't know how to calibrate my coffee grinder


Check bunn.com for a free download of your model's manual.
You should contact your vendor for service.
*** the following is for information only. Service should be performed by a qualified tech.***
* Most Bunn grinders usually have an adjustment screw in the middle of the burr plate housing.
* LPG is under the bottom chute. It's hard to see and you may need a mirror. Take a stubby flat blade screw driver in the slot and turn as needed, but go a quarter turn at a time!
* G2/3 have a large dial with the grind sizes clearly marked out. There is an adjust/calibration screw in the center of the knob.
* G9 have a large bolt in the center of the burr with a slot that could fit a quarter coin in it. You must un tighten the locking nut to turn it. Make sure you lock it down again after the adjustment.
* Final; if there any loud noise or grinding metal sounds or the motor hums and stops. Then turn off grinder right away. Back off whatever you did last and try again. If it's still making noises then unplug and call your vendor for service.
Aloha, ukeboy57

Jan 27, 2014 | Bunn Coffee Makers & Espresso Machines

1 Answer

I cannot adjust the grinds its only cming out fine even if I turn the screw in the center


You should call your vendor for service.
*** The following is for information only. Service should be done by a qualified tech.***
* Check bunn.com for a free download of the G3 manual
* If turning the dial does not change the grind size then the inner burr spring is broken, stuck, of missing (it broke into small pieces to fall into someone's coffee grounds). Call vendor for service.
* If turning dial is very loose then the lock screw is loose. check setting then tighten down to lock into place. It's usually a small 1/4" hole on the side of the knob.
* The burr plate may be gummed up and stuck in place. Especially if oily beans or 'flavored' beans were ground in this machine often.
* It's possible the Grinder is WAY out of calibration. It's so far out of adjustment that the only setting is fine when the dial is set on course ground. This grinder was not assemble correctly. Check the parts diagram. Call your vendor for service.
Aloha, ukeboy57

Jan 18, 2014 | Bunn -o-Matic G3 (3 lb. Commercial Coffee...

1 Answer

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...

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

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.

Jun 28, 2009 | Mazzer Mini Burr Coffee Grinder with Timer...

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.

Apr 21, 2009 | Bunn Coffee Grinder

1 Answer

Bunn G2 is caked and I need to remove burr gear


For this job, you will need detailed instructions. You can download a use and cleaning manual for this Grinder at this adress: http://www.bunn.com/pages/techdocs/manuals/grind.html

Nov 18, 2008 | Bunn Commercial Grade Home & Office Black...

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