With the Shift On Fly system Rexroth has developed an economical and compact travel drive. The new, cost-effective and rugged transmission concept is based on a synchronized gearbox. The accustomed high tractive force at startup as well as the good efficiency of the hydrostatic component are maintained. Shifting into 2nd gear while moving allows the maximum speed to be attained. The system is based exclusively on standard production components with high reliability, thereby ensuring high machine reliability and up-time.