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一台沃尔沃EC210BLC型挖掘机在施工中出现回转启动速度缓慢、负载时回转无力的故障。该机主控阀液压系统如附图所示。首先检查双向回转是否都有此故障。若只是一个方向有,则说明回转马
A Volvo EC210BLC excavator appeared in the construction of the rotary start slow, load rotation failure weakness. The machine main control valve hydraulic system as shown in the figure. First check whether the two-way rotation has this failure. If there is only one direction, then the revolving horse