Six graders in the D-Series feature more than 100 design changes. The series includes the 672D/772D/872D six-wheel-drive graders and 670D/770D/870D tandem-drive graders, ranging from 185 to 245 horsepower. The redesigned cab improves comfort, convenience and visibility. A multifunctional monitor provides operating and diagnostic information, and a sealed switch model with backlit push buttons is located to reduce operator fatigue. Pressure-compensated load-sensing hydraulics provide improved control.