When the long arm excavator stops after entering the field after construction, after long idle or after thunderstorm, it is found that the long arm excavator has no response after the torsion switch is found. First of all, we should consider whether the battery has electricity or whether the total switch is normal. The maintenance personnel use 2 wires to connect to the positive and negative electrodes of the battery, and touch the other ends of the 2 conductors. It is found that there is a strong spark and can be judged that the battery has electricity.
When the engine drives the diesel engine, the speed is too low. It is obvious that the load of the starting machine is too large, so the diesel engine can not be started smoothly. The hydraulic system of the machine is directly driven by the diesel engine to 2 parallel variable piston pumps. When the valves in the control valve group are in the middle position, the 2 plunger pumps come to the negative flow control valve through the middle passage of the valve group, and then return to the oil tank through the throttle hole. The pressure difference between the two ends of the throttle is fed back to the main pump and the angle of the inclined plate is minimized, and the displacement of the main pump is also reduced.
当挖掘机行驶或作业过程中水温快速升高，直至开锅，水散热器盖处有蒸汽或沸水冒出，水温报警器报警。用电子测速表测得风扇转速在800 r/min以下，明显偏低。 故障原因可能是机器中的液压油污染度偏高，流经热平衡电磁比例阀时将阀芯卡死，使电磁比例阀在工作时不能完全打开，造成风扇转速过低，水温迅速升高。
When the water temperature rises rapidly, the long arm excavator driving or operating in the process until the water boil, steam or boiling water at the radiator cap out, temperature alarm. The speed of the fan is measured below 800 r/min by the electronic velocity meter, which is obviously lower. The cause of the failure is probably that the hydraulic oil contamination in the machine is very high. When the heat balance electromagnetic proportional valve is applied, the spool will be stuck, so that the electromagnetic proportional valve can not be fully opened when working, resulting in the low fan speed and the rapid rise of the water temperature.
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