Excavator DH55 DH60 proportional solenoid valve main gun relief valve XKBF-00743

1.The overall structure of the full hydraulic excavator

          Hydraulic excavators mostly use double pump circuit constant power variable hydraulic system, most of which use constant power regulator to control two hydraulic pumps, and all working mechanisms are divided into two groups (see bottom map)
Manual mechanical operation valve or pilot system control operation valve to complete the job. In addition, in the bucket rod, bucket, boom operation, in order to improve the speed of two pumps combined flow.
2 .Fault diagnosis sequence

      The order of fault diagnosis of excavator hydraulic transmission system is: understand the working condition of equipment before and after the fault External inspection - test observation (fault phenomenon, on-board instrument)- internal system inspection
(Refer to the system schematic diagram) Instrument inspection system parameters (flow, temperature, etc.) logical analysis, judgment, adjustment, disassembly, repair test - fault summary record.
      There are many kinds of excavator faults, according to the characteristics of different models, make full use of the equipment's own monitoring system, specific problem specific analysis, master effective fault analysis methods, and compare the hydraulic system
According to the principle diagram, the total oil circuit is divided into several branches according to the work function, according to the fault phenomenon, follow the order from outside to inside, from easy to difficult, and exclude the branch one by one. In case of more complex synthesis
Failure, should carefully analyze the fault phenomenon, list the possible causes one by one to eliminate.