The New Heavyweight: John Deere’s 2026 Diesel ZTrak Lineup The landscape of professional mowing is shifting. John Deere has officially pulled the curtain back on its Model Year 2026 Diesel ZTrak Mowers, and the headliner is a machine that redefines what "wide-area" productivity looks like in a zero-turn package. Whether you are managing massive municipal properties or tight commercial complexes, the new lineup—consisting of the Z997M, Z997R, and the powerhouse Z998R—introduces tech that was once reserved for high-end golf course equipment.