Excavator Hydraulic Gear Pump Manufacturer & Wholesale Supplier

Cause:

Internal wear (such as excessive axial/radial clearance);

Leakage caused by overflow valve failure or oil contamination;

Air leakage on the suction side or excessive pipeline resistance.

Solution:

Replace worn gears, side plates or sleeves;

Clean or replace the overflow valve, and use hydraulic oil with a cleanliness standard (filtration accuracy ≤60μm);

Check the sealing and optimize the diameter and length of the suction pipe.

Cause:

Wrong rotation direction causes high-pressure oil to impact the oil seal;

Axial/radial force is too large (installation coaxiality deviation);

Seal material is mismatched or aged.

Solution:

Ensure the pump is rotating correctly and use an oil seal with a pressure resistance of ≥0.5MPa;

Adjust the installation coaxiality of the coupling (error ≤0.1mm);

Select oil-resistant seals such as nitrile rubber (NBR) and replace them regularly.

Cause:

Insufficient oil suction (filter element blockage, low oil level or pipeline leakage);

The oil viscosity is too high or contains bubbles;

Bearing damage or insufficient gear meshing accuracy.

Solution:

Clean the oil suction line and ensure the oil tank liquid level;

Replace the oil with appropriate viscosity and remove the air;

Replace the bearing or return to the factory to calibrate the gear accuracy.

Key measures:

Regular maintenance: replace filter elements and oil every 500 hours, and check the status of seals;

Select high-quality spare parts: such as original seal kits (such as KFP51 nitrile rubber kits);

Optimize working conditions: control oil temperature (≤80℃) and system pressure (≤90% of rated value).

Verification process:

Bench test: check whether the pressure, flow and noise meet the standards;

Load test: simulate actual working conditions for 30 minutes, monitor temperature rise and leakage.

Warranty service:

Professional repair shops (such as Permco) provide a 1-year warranty, covering parts replacement and labor costs.

Selection points:

Flow and pressure: Calculate the displacement based on the cylinder thrust (F=P×A) and speed;

Fluid compatibility: Mineral hydraulic oil (viscosity 16-80cSt) is preferred, avoid using highly polluted media;

Installation environment: Self-priming height ≤500mm, avoid high temperature or excessive vibration.