I am trying to dissasemble my A9 grinder to clean the burr mill. The acorn nut on top doesn't budge. Is it reverse threaded or just tight?

Softly Scrambled: Kitchenaid A9 Grinder Refurbishment.

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Mar 1, 2014 - This is an original A9 from the days when Kitchenaid was owned by Hobart. ... Yes, it worked and would grind coffee, but the motor seemed to labor and the grinds were ... I am now doing this for mine, but I can not for the life of me get to the bushings. Does ... I don't recall a ball bearing from repairing my A9.

KitchenAid Burr Coffee Mill KCG200 (aka A-9) - Automatic Washers ...

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Jan 13, 2013 - 49 posts - ‎12 authors
I'll definitely use that cleaning method if I can't get the grinding mechanism .... I'd try lifting the lower burr assembly out with the aid of two flat ...

Kitchenaid A9 Coffee Grinder - HubPages

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Sep 20, 2013 - Where can I buy a retro Kitchenaid A9 Coffee Grinder? ... are paying for (is it new in box, has it been used for 20 years, or does it need repair).

KITCHENAID A-9 INSTRUCTIONS MANUAL Pdf Download.

I don't see a question in the paragraph but common problems for the A9 are 1) Shear pin 2) Motor brushes 3) slow motor operation
If shear pin then the grinders won't turn or may intermittently rotate if pin is half broken
If motor brushes worn to nubs then a fast clicking noise and sporadic on off operation followed by no operation
If motor is slow then the commutator may need cleaning requiring removing the rotor

Remove the grinder tray, remove the grinder top and clean out the burrs.
lift the command unit. close and remove the bean hopper. Press in the two thumb tabs either side of the grinder tray and pull the tray forward. If it's not been removed for a while it could be very tight. Push the tray in first then pull.
with the grinder tray removed, take out the white plastic ring that the hopper sits on. Unscrew the two Philips head screws in the top section of the grinder. Remove the screws and rotate the top section anti clockwise whilst lifting off. You should now have access the the grinder burrs. Carefully clean every part of the teeth burrs with a stiff brush or small screwdriver.
turn the tray over and examine the bottom end of the shaft which passes through the grinder. The centre is usually rubber and this can become detached with age. If the rubber is shot you will need to replace the pulley shaft. Check to the tension of the belt From the motor to the pulley shaft
Once everything is clean and clear, reverse the process to reassemble the machine.
you should find it now grinds ok

I found this while searching for shear pins http://www.partselect.com/PS984110-Whirlpool-9707016-Nut-Acorn.htm

Hi
I would suspect that the burrs have never touched. There has to be some coffee grounds in the threads that is preventing the burr assembly form going in any farther. Remove the burr assembly and check the threads inside the chamber. If there is any black coffee residue it has to be removed. It sometimes has to be chipped out of the threads. We used a dental probe to remove it. Then a tooth brush. When reassembling the burr assembly turn all the way in until you see the acorn nut in the center rotate. STOP. Back the assembly back until the nut stops rotating. That is ZERO. You can install the bean hopper with the zero facing the mark. You can also move the assembly a little counter clockwise, but not clockwise, to line up the screw holes. Make sure that you have the hopper stop in place before tigntening you screw down. Then turn the bean hopper to 7 and test.

Start by closing the hopper and grinding all the beans through the unit. Remove the hopper and look for any lock screws on the top of the adjustment collar (or ring). Remove the screws if present and turn the adjustment collar clock-wise (coarser) until it comes off. Pull out the upper burr holder. You then need to take out the three screws that hold on each burr (blades) and remove them. Then you want to use a shop vac to clean out all of the grounds. Make sure there is no coffee on the burr holders that could cause the new burrs to not be level. Assemble the new burrs on to the holders. Take a dry towel and clean the threads of the collar and the threads inside the mill. You don't want any coffee grounds on the threads, that could cause the adjustment collar to lock up and may damage the threads which can be extremely expensive. Use a small amount of lithium grease on the threads and reassemble. Screw the adjustment collar all the way down to where the burrs are touching. Then back it up 1.5 numbers (12-14 little bumps on the outer edge of the collar). This is a good "starting point". Pull some shots and adjust as needed.
good luck [email protected]

Search online for "Kitchenaid 8204548" that's the parts list. It should take you to a Sears page with the parts you need.

The part number for the Acorn Nut is 9707016.

Apparently, you unplug the unit, dump any beans out of the supply hopper, then rotate the burr intake module in the bottom of the supply hopper counterclockwise. You can then pull it out, and brush it out. You also brush out the other half of the burr unit; don't put water or anything in it, you'll kill your grinder. You can, in theory, wash the removable module, but if you do, be sure it's ABSOLUTELY dry before you put it back together.