Analysis of common reasons why hydraulic pumps in excavators cannot suction oil -1

1. Low oil level:

Reason: The oil level in the hydraulic tank may be insufficient.

Solution: Check the oil level and add oil as needed to maintain the correct oil level. Also, check if there is any oil leakage that may cause oil leakage.

2. There is air in the hydraulic system:

Reason: Air may enter the hydraulic system through leaks or improper bleeding procedures.

Solution: Exhaust the hydraulic system to remove residual air. Identify and repair any leaks in the system to prevent further air from entering.

3. Filter blockage or dirt:

Reason: Clogged or dirty filters can limit oil flow into the pump.

Solution: Regularly replace or clean the hydraulic filter to ensure unrestricted oil flow.

4. Wear or damage to pump components:

Reason: Over time, pump components (such as inlet valves) may wear out or be damaged.

Solution: Check if the pump components are worn or damaged, and replace them as needed. Ensure proper maintenance to extend the lifespan of these components.

5. Restriction of inlet pipeline:

Reason: Restrictions in the inlet pipeline (such as kinks or blockages) may prevent the pump from sucking in oil.

Solution: Check for any obstacles or restrictions in the inlet pipeline and remove them. Ensure that the inlet pipeline is properly routed to avoid twisting.

6. Oil viscosity issue:

Reason: The viscosity of hydraulic oil may not be suitable for working conditions or temperature.

Solution: Use hydraulic oil with the correct viscosity grade according to specific working conditions. At extreme temperatures, consider using oil with a wider viscosity range, or using an oil heater or cooler as needed.

7. Mechanical damage:

Reason: The pump itself may be mechanically damaged, causing it to lose its oil suction ability.

Solution: Check the pump for any physical damage and resolve any issues found. If the pump is severely damaged, it may need to be replaced.

8. Incorrect pump size:

Reason: The size of the hydraulic pump may not be suitable for the application, resulting in insufficient oil suction.

Solution: Consult hydraulic system experts to ensure that the pump size is suitable for the system's requirements. It may be necessary to replace the pump with the correct capacity.

9. Contaminated oil:

Reason: Contaminated oil, such as water or debris, can hinder the pump's ability to operate effectively.

Solution: Drain the oil and replace it with clean, high-quality hydraulic oil. In addition, implementing better oil management practices to prevent future pollution.

10. Pump stuck:

Reason: Stuck or stuck pump unable to suction oil.

Solution: If the pump gets stuck, it may need to be disassembled, inspected, and repaired. In some cases, replacement may be necessary.