I have a 2 wheel drive Kubota l185. I got stuck on a slight incline in a muddy ditch. I use the differential lock pedal but was only able to get out of the ditch by being pulled out while backing up and again using the differential lock pedal. When I was free from the ditch and unhooked the tractor from the vehicle that pulled me out I moved the tractor from the ditch approximately 20 ft and stopped. When I went back to the Tractor to move it back to the barn only the left rear wheel would spin. The right rear appears locked up. Have I damaged the differential or transmission? What would be my first step in troubleshooting this problem? By the way my rear Hydraulics went out a couple weeks ago and when I check the fluid level it appeared full. Could this be related? Thanks for any and all help.