07-08-2025, 09:26 AM
The Hitachi 120-5 is a commonly used mid-sized excavator in various construction projects. Its hydraulic pump plays a crucial role in transferring power to the hydraulic system, ensuring smooth operation of the machine's functions. Recently, users have discussed several issues with the hydraulic pump, such as reduced hydraulic performance and pump failure. This article summarizes these problems and the suggested solutions.
Common Issues
Due to the high cost of hydraulic pumps, many users opt for either purchasing a second-hand pump or repairing the existing one. When repairing, it is crucial to ensure that all components meet the required standards to prevent further complications. In cases where the pump is severely damaged, replacing it with either an original or compatible alternative is recommended to avoid compatibility issues.
Conclusion
Common issues with the Hitachi 120-5 hydraulic pump include low pressure, pump damage, and overheating. Regular oil changes, pump maintenance, and seal inspections can help extend the lifespan of the hydraulic pump. Timely attention to any abnormalities can prevent further damage, ensuring the excavator operates efficiently and reliably.
Common Issues
- Low Hydraulic System Pressure
Some users have reported issues with low hydraulic pressure, leading to sluggish operation or a reduction in machine functionality. This is typically linked to a decline in the hydraulic pump's performance or contamination of the hydraulic oil. Dirty or aged hydraulic oil can increase friction inside the pump, reducing its efficiency and performance.
- Pump Damage and Leaks
Another common problem is pump damage or oil leaks. Prolonged heavy-duty operation or poor-quality hydraulic oil can cause the pump components to degrade, resulting in seal failure and oil leakage. If not addressed promptly, this can prevent the hydraulic system from maintaining proper pressure, affecting the machine's overall performance.
- Overheating Issues
Users have also noted that the hydraulic pump tends to overheat. This is often caused by increased internal resistance, which forces the pump to work harder. Overheating can not only reduce the pump's efficiency but also cause damage to the pump itself and other vital components.
- Regular Inspection of Hydraulic Oil Quality
The cleanliness and quality of hydraulic oil are critical to the lifespan of the hydraulic pump. It is recommended to change the hydraulic oil regularly and use suitable filters to maintain oil cleanliness. Using high-quality hydraulic oil and ensuring it stays within the recommended temperature range are key to keeping the hydraulic system running smoothly.
- Monitoring Pump Performance
Regularly checking the hydraulic pump's pressure, temperature, and operational sound can help detect issues early. If any pressure fluctuations or abnormal sounds are noticed, it is important to check the hydraulic pump and associated hoses to prevent further damage.
- Replacing Seals and Components Regularly
The seals in the hydraulic pump can wear out or degrade over time due to prolonged exposure to high temperatures and pressures. It is advised to regularly inspect and replace the seals to avoid oil leaks and ensure smooth operation of the pump.
Due to the high cost of hydraulic pumps, many users opt for either purchasing a second-hand pump or repairing the existing one. When repairing, it is crucial to ensure that all components meet the required standards to prevent further complications. In cases where the pump is severely damaged, replacing it with either an original or compatible alternative is recommended to avoid compatibility issues.
Conclusion
Common issues with the Hitachi 120-5 hydraulic pump include low pressure, pump damage, and overheating. Regular oil changes, pump maintenance, and seal inspections can help extend the lifespan of the hydraulic pump. Timely attention to any abnormalities can prevent further damage, ensuring the excavator operates efficiently and reliably.
