... 2.Vibrating frequency:50HZ 3.Roller Engine:ZN490Q 4 Ton Hydraulic road rollerHydraulic oscillation and vibration, geat centrifugal force and high compactness ... .This roller has articulated frame,hydraulic steering,small turning radius and flexible drive.Anticorrosive spray water ... power33.5 KW Reated speed 2600r/min 4 Ton Mini Hydraulic road roller