Dolphin not running, belt hard to turn in one direction
My dolphin was working fine. Recently when I put it in it runs one direction, goes up the wall, then goes the other direction and stops. I looked at the tracks and belts and they look fine. When I turn the belts the drive turns smooth in one direction, but is difficult in turning the other direction (i here grinding and it's hard to turn). Is this normal with all dolphins as far as turning smooth one direction? I don't know whats going on. The yellow propeller is turning and everything else looks good. Any help?