I just bought a case 1838 with 2100 hours on it. It runs great does not smoke and seems to have good power. this is my first skid steer, so I'm really not sure what is normal and what is not. The question I have is, what would cause a groaning noise when I make turns? It seems to be more annoying at low RPM. The machine turns fine, the loader functions are smooth and powerful, but this noise really takes some enjoyment out of operating this machine. Any help would be really appreciated.