Single Drum Vibratory Roller Hydraulic vibration system, double-frequency and double amplitude. Static linear load 425 N/cm JZZ20 Compactor ... emission and low noise.2,The hydraulic vibration system,double-frequency and double amplitude,imported variable piston pump and imported ... , MIDDLE EAST, EASTERN ASIA AND AUSTRALIA. JZZ20 Road Roller (Compactor),Single-drum Vibratory Roller, Drum width 2178mm