Kubota's most powerful front-mount mowers. Ever. The revamped F Series not only boasts the comfort of deluxe seating and operator levers, but also the efficiency of 4WD and Auto-Assist 4WD. And it’s Kubota's most technologically advanced diesel engines yet. The F Series diesel engines are not only more powerful than ever, they’re more fuel efficient and compliant with the EPA’s Tier 4 regulations.