The Main Reason Why the Swing Arm Cannot be Lifted with Load

1. The hydraulic pump of the excavator is seriously worn

When running at low speed, the internal leakage of the pump is serious; when running at high speed, the pressure of the pump increases slightly, but due to the wear and internal leakage of the pump, the volumetric efficiency drops significantly, and it is difficult to reach the rated pressure. The long-term operation of the hydraulic pump aggravates the wear and the oil temperature rises, which causes the wear of the hydraulic components and the aging and damage of the seals, the loss of the sealing ability, the deterioration of the hydraulic oil, and finally the failure occurs.

2. Unreasonable selection of hydraulic components

The specifications of the arm hydraulic cylinder are 70/40 non-standard series, and the seals are also non-standard parts, so the manufacturing cost is high and the replacement of the seals is inconvenient. The small cylinder diameter of the arm cylinder is bound to increase the set pressure of the system.

3. The hydraulic system design is unreasonable

The control valve and the full hydraulic steering gear are connected in series with a single pump, the set pressure of the safety hydralic valve is 16MPA, and the rated working pressure of the hydraulic pump is also 16MPA. The hydraulic pump often works under full load or long-term overload (high pressure), and the system has hydraulic shock. If the oil is not changed for a long time, the hydraulic oil is polluted, which aggravates the wear of the hydraulic pump, so that the casing of the hydraulic pump bursts (it was later found that such failures.

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