ZD1500 SERIES The ZD1511 takes its place at the top-of-the-line of the ZD1000 and ZD1200 Series zero-turn mowers. Along with the electronically controlled Kubota diesel engine fitted with the environmentally friendly diesel particulate filter (DPF),the Aerodynamic Cutting System (ACS) significantly enhances the cutting performance. Further,the redesigned air suspension seat and the new HST levers contribute to pleasant,precise operation by enhancing operator comfort.