Comments from my life, family, and projects I enjoy.

Saturday, March 1, 2014

Kitchenaid A9 Grinder Refurbishment.


Sometime last year I happened upon this Kitchenaid A9 coffee grinder on Ebay. The starting bid was low and there was no reserve so I bid. Much to my surprise I was the only bidder and won the little grinder for a very reasonable price. This is an original A9 from the days when Kitchenaid was owned by Hobart. This design was originally introduced in 1937 and I think it was discontinued in the 1950's. Later in the early 2000s Whirlpool, the current owners of the Kitchenaid brand, reissued an updated version of the little A9.

     Once I received it in the mail I gave it a cursory inspection and tested it's operation. Yes, it worked and would grind coffee, but the motor seemed to labor and the grinds were inconsistent. There was also a distinct electrical odor from the motor. A quick tear down revealed worn motor brushes and very worn burrs. I guess the original owner used the grinder a lot. Measuring the brushes with a micrometer, I determined a suitable replacement brush was part number 414 from carbonbrush.com. A light polish to the commutator ring with some 400 grit paper and a drop of light oil on the bearings had the motor working perfectly.

     Finding replacement burrs would prove to be more of a challenge. I had read on some coffee forums that the burrs from the newer A9 from Whirlpool were a direct fit. I found the manual for the new version online and called the number in the manual to order new burrs from Whirlpool. The nice gentleman informed me that the replacement burrs were no longer available, but he would be glad to sell me some wonderful new coffee grinding and brewing gadgets. I thanked him for his time and moved on to continue my search for the burrs. Another coffee forum indicated that the burrs were only available as an assembly. I searched for the upper and lower burr support assemblies and found them both available, but the upper support assembly was prohibitively expensive. Fortunately the burrs are removable from their support assemblies and both burrs are identical. I ordered two lower burr support assemblies (pn 9707092) from ddapplianceparts.com. They were very helpful and answered all my questions. Once I placed the order I received the parts in just four days. I highly recommend them.

Below are some photos of the original burrs in the upper and lower support assemblies.






Here are the two new lower support assemblies with new burrs in the upper part of the photo.




And here are the new burrs installed in my original A9  upper and lower burr support assemblies.






So now the little grinder is working perfectly. The motor purrs smoothly with no disconcerting odors and the new burrs produce a very consistent grind for my morning cup. I think I'll have another cup now.

25 comments:

Becky said...

It works like a dream. It is so wonderful to have such a handy husband.

Buttons said...

I had no doubt you could get it working:) B

Scott said...

Thanks, I love fixing things. Thanks for stopping by.

Robert said...

Hi Scott, Thanks for sharing. When you replaced the bushings did you oil the felt pad and grease the ball bearing? If you did, what type and how much oil/grease did you use?

Scott said...

Hi Robert,

Both the upper and lower bearings are simple bronze sleeve bearings that rest in a small cup assembly with a felt oiler. I think any light non-detergent oil will work just fine. I used 3in1. I think it is a 10w. About three drops on the felts and one on the shaft for good measure is more than adequate.

Scott

Shelley said...

Hi Scott and Becky,
Thanks for the post. My son picked me up one of these mills at a yard sale and it runs well, but not quite right. I seem to be missing that stem in the middle of the lower burr. I put a machine screw in it but it works its way out. Do you know where I can get this stem? (or what ever the part it's called). And what is it actually doing? Sorry if I sound stupid, just trying to learn. I love old appliances, they are meant to last forever!
Thanks!
Shelley

coolate said...

Thanks for sharing! I am now doing this for mine, but I can not for the life of me get to the bushings. Does the lower burr mount just slide off? The bottom plate does not seem to want to come off... Am I missing a trick?
Thanks!!

Scott said...

Remove the ring nut from the power switch. Remove the 4 small screws around the perimeter of the bottom plate. The entire motor assembly will now drop out from the bottom. It is a bit fiddly to guide the switch, motor assembly and power cord, but not to difficult.

Scott.

Anonymous said...

Hello Scott, I recently was given an old A-9 coffee mill. Its exactly like the one pictured in your post. It started limping after about 6 months. I have it disassembled and it also needs brushes. Your post is encouraging and I am ordering the brushes and burrs.
a ball bearing fell out on the table ? where does it live ?
Jack Kane
Summerland Key, FL

Scott said...

Jack,

I don't recall a ball bearing from repairing my A9. There are 3 spring loaded post nestled in the housing that press against the upper burr support assembly providing a detent mechanism for the grind adjust. The upper bronze shaft bearing is ball shaped with a hole through the center. It rides in a socket in the housing under the lower burr support.

Jack Kane said...

Hello again Scott, I was on a short vacation, but am back home and getting on with this coffee mill. How does the lower burr assembly attach to the motor shaft ? I don't want to force it ! The burrs are being very stubborn. and don't want to come loose from the assembly (top and bottom). I would feel a lot better getting it taken apart, before I order new ones. I have the new brushes and could put back together. But, after reading your performance report on the new burrs - I want some !
Thank you Scott
Jack

Scott said...

The bottom burr support assembly should pull off straight up. The bottom burr support assembly slides over the motor shaft and engages a small shear pin drilled 90 degrees through the motor shaft. Old coffee dust and rancid coffee oils are probably keeping it glued in place. Try heating the assembly with a hair dryer and it should pull free. Once both burr support assemblies are out, you may have to soak the burrs with WD-40 to get them free from their support assemblies.

Scott.

Heather Gragg said...

Hello Scott I have an A9 that was my grandparents. It still has the logo on the quart jar but I started trying to fix this before reading many post. It runs hard but has a little grinding noise at times but I have not tried beans in it yet. I put a sweeper cord rated at 300 v but it does not have ground is that ok? Also I have a ball bearing that I am pretty sure came out of it because when I took it past I put it in a bag for a while then a few months later I tried to continue fixing it. I found someone else asked you that question about a ball bearing do you still think they don't have one? Thanks for any help?


Lacey Hendrix said...

Hello Scott- This is so helpful!! Thank you for posting such great info and in detail. I am on a search for the same parts and the website DDappliances does not seem to cary that part number any longer, did you call them to find it or was it just online? than you for your help.

Scott said...

To order the Burr assembly I had to call DDappliances. I don't think the part was listed on their website. Several people have mentioned a ball bearing falling free from their grinders. My grinder did not have this, but I'm starting to suspect that the design of the detent feature for adjusting the fineness of the grinds may have changed some over the years. I would look for a spring in a pocket under the upper burr adjusting ring where the ball may belong. I'm using a 2-wire power cord on my grinder, but it is located well away from the kitchen sink. A 3-wire cord with ground would be safer, especially in a kitchen where it may come in contact with water.

Charlotte said...

how do you remove bottom burr support assembly , mine wont budge

Anonymous said...

Hi Scott..following your directions, I replaced both burrs in my 1937 vintage A-9 coffee grinder..it seems to run well without weird noises or smell. My question is how do I oil it and how do I get to the part that needs the oiled. I am new at this. Thanks, Char Please describe step by step in detail. I'm excited!

Anonymous said...

I inherited my A9 from my mother. Never have done a thing to it. Was just using it today and thought to look on the Internet to see if anyone else was. Good to see you are:)

Unknown said...

The bearing goes in the bottom plate . The motor shaft rides on it

Nass man said...

The Bering goes in the bottom plate. The motor rides on it.

Claire said...

Hello! Just wanted to say thanks for these instructions - and especially for including the part number. I just replaced the burrs on my grinder and it's like new. THANKS!

Cindy said...

Help! I bought my A-9 at an antique store about 30 years ago and it has always worked great. This morning I started grinding and it started and wound down and stopped a few seconds later. I thought the power had gone out, but no. I cannot seem to find a small appliance repair shop in the Seattle area. I am NOT handy, any suggestions?
Cindy

Anonymous said...

For those posters with a loose ball bearing: On my A-9, the shaft sits on a ball bearing, acting as a thrust bearing. If you removed the shaft and turned the assembly upside down, it probably fell out.

Jim said...

I just finished repairing my Hobart/Kitchenaid K-9 coffee grinder and called ddapplianceparts.com to order replacement burr assembly (9707092) and was told by Dennis that they have not been available for 7 years and that he had contacted his vendor, again with a negative response.

Does anyone else know of a source for this burr assembly? thanks, Jim

Anonymous said...

Scott,
I have three of these, if I send them to you can you fix them? Be happy to pay you!
Thanks,
Brenda

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Midlands of South Carolina, United States
Husband, Father, Quality Engineer, Electronics Professional, and tinkerer. Facinated by old technology and well made old tools. Old iron is good.