维修挖掘机中修复或更换主泵并清洗系统油路后,经一段时间运转,常出现空转强烈振动、在动作状态时振动虽减弱但不消失的现象。 现根据WY100液压挖掘机的液压系统(图1),对此故障分析如下: 该机液压系统采用双泵双回路串并联系统。JB218定量柱塞泵有左泵和右泵之分。径向柱塞泵20的左泵高压油进入前组阀Ⅱ,该阀组控制动臂、斗杆和左行走等作业。回油串联进入限速阀、背压阀、滤清器后回到油箱。右泵高压油进入后组阀Ⅰ,该阀组控制回转马达。铲 Repairing excavators to repair or replace the main pump and clean the system after the oil, after a period of operation, often empty strong vibration, vibration in the action state though weakened but does not disappear. According to WY100 hydraulic excavator hydraulic system (Figure 1), the failure analysis is as follows: The machine hydraulic system using double-pump dual-loop series-parallel system. JB218 quantitative piston pump has left and right pump points. The left pump high-pressure oil of the radial piston pump 20 enters the front set II, which controls the boom, stick, and left-hand drive. Return oil into the speed limit valve, back pressure valve, filter back to the tank. Right pump high pressure oil into the rear group valve Ⅰ, the valve control rotary motor. shovel