Anyone have a Magnum 001 tire changing machine, or at least know how use one?

I have a Magnum tire changing machine that works well on small automotive tires but i want to know how to adjust it so that i can remove front tractor tires from the rims.Anyone have a Magnum 001 tire changing machine, or at least know how use one?May not be able to be done - some of the tire changing machines are limited as to the rim diameter that will fit; there are different websites with more info, just do a Google search :]