when you were looking at the friction wheel did you notice if you could move it without it rubbing on the disc.
sounds like it is adjusted a little tight.if so you only have to back of the adjustment nut a half turn .
might need to check the book on it but the adjustment should be on the left han side near top of rear panel.
later chris
craftsman 10/28 snowblower with tracks husky 372xpg chainsaw sachs dolmar bc212 bushsaw mondo trimmer monster tractor with trailer cheep wheelbarro and couple shovels and a partridge in a pear tree