... system 4. safe and reliable performance Our YZ Full Hydraulic Single Drum Vibratory Roller class includes the following model types:YZ12C, YZ18C, YZ20C, ... you as soon as possible. Full hydraulic, two-wheel drive,four-gear stepless speed, short turning radius, and great ... for long use; Grade-III braking system with integrated mechanical, electrical and hydraulic control which ensures the safety and ...