Single Drum Vibratory Roller Hydraulic vibration system, double-frequency and double amplitude. Static linear load 425 N/cm JZZ20 Compactor, road roller9.5ton Single DrumVibratory Road Roller1,The water-cooled ?Engine,chosen from SDEC,with strong power,low emission and low noise.2,The hydraulic vibration system,double-frequency and double amplitude,imported variable piston pump and imported motor ...