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ＹＺＪ２０Ｈ型压路机是高等级公路的压实机械。其液压系统具有设计先进、可靠性高等优点，由驱动液压系统和辅助液压系统两部分组成（见图１）。 辅助液压系统改变了以往的转向泵供油给转向器，转向器回油至油箱的设计方法，使转向器的回油到驱动液压系统的伺服机构。这样，驱
YZJ20H-type roller is a high-grade road compaction machinery. Its hydraulic system with advanced design, high reliability, driven by the hydraulic system and auxiliary hydraulic system of two parts (see Figure 1). Auxiliary hydraulic system to change the previous steering pump oil supply to the steering gear, steering gear back to the tank design method, the steering gear oil back to the drive hydraulic system servo. In this way, drive