When the excavator is working, the water temperature can reach 98 ℃, the hydraulic oil temperature can reach 85 ℃, and the temperature of diesel engine turbocharger and muffler can reach 700 ℃. The pressure of the pilot oil circuit is 3.9MPa, and the maximum pressure of the hydraulic oil pipeline can reach 34.3MPa. In order to avoid misoperation, operation and maintenance personnel must receive special training and obtain corresponding qualification certificates.
During the excavation operation of hydraulic excavator, there are four basic actions: bucket rotation, bucket rod retraction and release, boom lifting and turntable rotation. The expansion and contraction of the piston rod of the hydraulic cylinder and the forward and reverse rotation of the hydraulic motor in the hydraulic system are mostly controlled by the three position axial moving slide valve, and the operating speed is adjusted by the auxiliary device according to the type of the hydraulic system and the opening of the valve.
