ＷＹ６０型挖掘机，在行驶过程中有时会出现转向沉重的故障。据检查知，转向系统的零部件并没有损坏，故障是因液压油严重污染所致。对此，若仅简单地更换液压油并不能排除故障，通常须拆开转向系统的机件和流量阀（或溢流阀），将它们进行彻底地清洗。但由于拆装技术和其他原 WY60 excavator, driving in the course of heavy turn sometimes appear fault. According to the inspection, the components of the steering system were not damaged. The fault was caused by the serious pollution of the hydraulic oil. In this regard, simply replacing the hydraulic fluid does not eliminate the problem. It is common to disassemble the steering system components and flow valves (or relief valves) and thoroughly clean them. But due to disassembly techniques and other original