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you may want to try the link below and choose from over 14,000 sites what have reference to Brush Hog Mower, with out any detail relating to the make and model number you have its just a shot in the dark to try and help you
[google.co.uk...]
Have you tried phoning a mower supplier or mower maintenance in your area for advice
Some PTOs have a switch, some have a pin that can be removed from one pin location and locked into another. Forward and Reverse settings. Hard to diagnose without a model#. Then there's the issue of F/R on your PTO with a lever that can be activated from your tractor. Or a broken throwout arm.