I am having problems with the mower wanting to turn. Last year is started taking off slower and slower and had a harder time pulling a sulky. Thought it was maybe the trans belt. Got it out the other day and tightened it up and it seems better. Now I am having a hard time with it turning. You will go straight and hit the brake and it will just stop the mower. Could the drive belts be that worn? Any other ideas. I need this to do cleanups right away. Thanks in advance.