The customer once called to inquire about the phenomenon of weak lifting during the use of the crane, and to explain it to everyone. If the crane is unable to lift.

The reasons are generally:

The hydraulic motor has too much oil leakage, significantly reducing volumetric efficiency, and weak lifting ability;

The overflow valve of the control component leaks oil, and the system pressure cannot rise, resulting in weak lifting. Remove the motor oil drain port and operate the lifting mechanism to observe that the oil discharge is normal;

After dismantling the lifting overflow valve of the upper valve group, it was found that one O-ring was slightly damaged, resulting in oil leakage and pressure not rising. After replacing the O-ring, adjust the pressure to reach the design value.