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1.存在问题在对某款自重3.8t小型液压挖掘机试验时,操作人员将发动机调整到中低转速作业时,该机就会出现动作缓慢、复合动作不协调现象,且中低速时发动机严重掉速,甚至熄火。当该机做动臂提升加回转复合动作时,回转到位后动臂仍不能提升到位;当做动臂提升加斗杆外伸复合动作时,动臂、斗杆速度偏慢。我们选取了1台具有代表性故障的该型挖掘机进行了测试,测试其主泵在不同
1. There is a problem in a heavy 3.8t small hydraulic excavator test, the operator will adjust the engine to low-speed operation, the machine will appear slow movement, complex action uncoordinated phenomenon, and medium-low speed when the engine is serious Out of speed, or even turn off. When the machine to do boom lifting and turning composite action, the boom still can not be raised in place after swinging in place; as a boom lift plus stick extension composite action, boom, stick speed slow. We selected a representative of the failure of the excavator was tested to test the main pump in different