Hey guys, maybe a dumb question but im trying to remove my rear wheels on my ride on greenfield mower,The model is a MK 2A 30 inch cut. 11.5hp b&s engine. The code is 11A-45193 stamped on chassie. Ok so it has a single nut on the axle which I have removed but the wheels don't want to budge ?? am I missing something or is it just seized ?