remove front wheel cover
How do i remove the hub cap on the front wheel of a craftsman riding mower model number 536.270270?
I am not sure of that exact model but if the hubcap that you are describing is made of rubber, then it should be a little bit flexible. They are held on by a clip I believe. Don't pull it off straight, but try to take it from the side and see if it comes off. You may need to pry it off.
I am not sure if this would help but here's the instruction manual: