Hey guys, got a Honda HRC216HXA Commercial. Mower is in great shape other than after doing a very hilly account the other day, the left-side drive wheel does not engage. The right side operates normally, and the left side will come up to speed if the mower is lifted off the ground when the bar is pressed. I can see the axle spinning down there. Is there some kind of teeth or something like a flywheel on a bike? I remember that both sides used to click if you pushed the mower forward while the engine was off. Now only the right side clicks forward. Left side will still click if you spin the wheel backwards. What is the part called that I need? Thanks guys!