Outdoor Power Equipment (Lawn Mowers, Snow Blowers, Chain Saws and more) Discussions

I spent a few hours today getting my snowblower put away for the summer. When I pulled the bottom plate off to grease the chains, etc. I found bits of greasy black stuff -- seems to be rubber. And the pattern with which they were stuck to the casing seemed to indicate they came from the friction disc. Is this normal? Is it bad? If so, what caused it? I went ahead and cleaned the friction plate off with a microfiber sponge -- no soap, no grease, nothing -- just a wet sponge.