Aux Hyd Problem - 1 directional flow only

[crossfire190]

I recently purchased a 2005 ASV RC-50. I connected a bobcat soil conditioner and the drum would only spin in one direction. when I went to reverse direction, I could hear the hydraulics try to activate and then it sounded like the relief valve kicked in. This would happen when i tried continuous flow with the toggle switch or with intermittent flow from the joystick. What could the problem be? There is some damage to the male coupler on the machine - there are a few nicks/dents. Is it possible that coupler is not seating correctly and not allowing it to flow - Although it flows fine in the other direction... What else can I check? The service manual talks about fuses and relays, however, since i hear it trying to activate - i don't think it is an electrical issue...