you will need to remove the large hub nut & then the drum should normally pull off fairly easily,if it doesn't it's probably because it may have a wear ridge around the edge of the drum,also on these it is quite common for the friction material to become detached from the shoe which can also make it difficult to remove the drum. when you re-assemble it ,use a new hub nut & torque it to correct torque(and i think this one has to be staked with a chisel) .
baz b, November 2009