Excavator inabililty not only influence the normal processing of the assignment, but also will affect the service time of machine if not repaired in time. Excavator inability can be divided into:boom inability, arm inability and bucket inability. And the major reasons for the aboved faults are: 1.PPC valve breakdown 2.ineffective of piston assembly 3.Security Inlet valve failure I just summarised the aboved reasons, if you have something to add or to correct, please let me know.
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