I have a MFT 15/36 that has about 40 hours on it. A problem that I am having is that left rear tire spins when backing up and turning at the same time. It happens on flat or sloped grass and is only the left tire, never the right tire. I have double checked the pressures and they are all within Hustler specs (8-10 psi). When moving forward, the machine tracks straight with the levers even to each other. At first I thought it was operator error but it is getting very annoying now. Is this a hydro problem, or am I doing something wrong? Should I take it back to the dealer for repair or adjustment?