Use a 7/16 inch socket to remove the nuts and accompanying bolts securing the belt guard bracket to the rear belt guard.
You may need to hold the bolts in place with a 7/16 inch wrench during removal.
Don't misplace the washers that are removed during this step.
During reassembly, you may need to slightly loosen the two head bolts securing the belt guard bracket in order to properly align the bracket with the mounting holes in the rear belt guard.