How Do I Remove My Back Brake Hub

[diffinking]

how do i remove the brake drum on my atc 110 when .. i have got the brake drum cover off and the two large nuts on the axle ..then im left looking at the brake drum i have pulled and give it a little hammer and it wont budge ..what do i do now and am i doing this correct or is there something else i need to remove im trying to remove number 5 in the diagram and what is number 18 as i cant see a way of taking it off or whats it for
thnx ryan http://pic16.picturetrail.com/VOL661/3654888/9666494/156918656.jpg

[atctim]

heat - lubrication - heat - hammer - large screwdriver for prying.

THese little drums like to rust into place. Keep working at it, it will come off

[crackshot]

Soak the piss outta it with penetrating oil then work it off.
Once you get it off and do your brake work, put a dab of automotive grease on the splines and put drum back on.
It will make it much easier next time to remove and will come right off.