BTW, a call to KA has only this documentation: "Turn the phillips screw, etc." Makes me wonder if it was refurbished - or what the heck.
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
SOURCE: Broken shear pin in kitchenaid A9 Coffee Grinder
I was able to find 3/32 x 1/2 inch spring pins at a local hardware for 13 cents each. They may not last as long, but at the price I can replace as needed.
I also had to disassemble twice; I didn't notice that a portion of the old pin was wedged in the underside of the burr. When I put it back together the first time, the new pin rested on the old fragment and pressed the burrs too close together. On the coarsest possible setting, I got coffee powder!
Final note: The nut for the cap over the burrs is reverse-threaded...use a wrench on top, and a flat-blade screw driver in the slot at the bottom of the motor shaft.
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