Ｗ４－６０Ｃ挖掘机的回转系统若出现单向回转无力和不能制动时，多为双向溢流阀中有一个损坏；如出现不能回转并伴有异响时，则多为液压马达装配不当或减速器损坏；如左、右方向回转均不能动作且无异响时，则为减速器下端齿轮脱落；如双向回转均无力且动作缓慢，则为右工... W4-60C excavator oscillating system if there is one-way rotation and unable to stop the brakes, most of the two-way relief valve is a damage; if there is not turning and accompanied by abnormal sound, it is mostly improper assembly of hydraulic motor or If the speed reducer is damaged, if the left and right direction rotations cannot move and there is no abnormal noise, the gear at the lower end of the speed reducer falls off; if the two-way rotation is weak and the movement is slow, it is the right work.