Why does hydrostatic ranch king pro riding mower wheels only slide and none roll you do have relief bar released any suggestions how to repair?

Chances are that the brake is stuck. If the brake pedal is up then the linkage is probably stuck. Follow the rod from the brake pedal to the arm on the side of the rear axle. You should be able to push the arm forward and the brake will release. A little penetrating oil on the linkage where it pivots will help keep it from getting stuck again for a while. Just make sure you don't get it on the actual brake pads right behind the linkage.