Whenever grinding meat I will see black pieces of meat in the grind. Ive noticed when using the kitchen-aid or #12 grinder. I wish I knew what to do to prevent it.
Good reference. I’ll try the food grade grease and spray lube next timeThis might help.
Meat Grinder Residue
I have a Gander Mountain meat grinder which, on occasion, leaves a tiny amount of a sludge like black residue on the meat while I'm grinding. It's never a lot, but enough to get my attention. It's not oil or any discharge from the motor. Almost looks like it could be a bit of metal shaving...www.smokingmeatforums.com
I believe it's metal to metal wear dust and the meat picks it up. probably from where the auger meets the motor. I've had it happen with my last grinder, and just picked out the pieces that I saw.