I check last month to make sure my Toro HD826 OXE would start. I did - but then it didn't go into "gear".
I emptied the oil ( which was good) tipped it on its nose and took the bottom pan off.
Toro never lubed this thing at ALL from the factory! It is but three seasons in service.
The friction wheel lay shaft was rusted and the friction wheel hub seized to it. The shaft is hexagonal.
I took some red ScotchBrite to it, wiped it with a rag then with M1 0W40FS oil a couple times, put a bit of oil on the chains and sprockets. Freed it up, tested it, then closed it up. Somehow I didnt have to take either wheel off to do this.
After this winter I'll have to get the appropriate grease. My grease gun "disappeared" I think I leant it out and never got it back.