I had a Toro AWD dropped off here this morning for a service and to look at why the rear wheels were not driving. When I lift the front wheels off the ground they spin as you would expect but when I put them back down they stop. There is no sign of the rear wheels attempting to drive. I have adjusted the cables so they pull evenly but still no go. I haven't had a real study of it yet but just wondering if anybody has had a play with one and has any pointers?