31NB-10020 hydraulic pump

The 31NB-10020 is an axial piston hydraulic pump manufactured by Kawasaki Heavy Industries. It's a common choice for main hydraulic pumps in excavators in the 25-ton to 30-ton size class. This pump provides the necessary flow and pressure to power various excavator functions like

Arm and bucket movement Enables precise control for digging, lifting, and dumping operations.

Track drive Allows for maneuvering and positioning of the excavator.

Blade control (if equipped) Provides accurate control for grading and clearing tasks.

Attachment operation (breakers, augers, etc.) Supplies hydraulic power for various attachments.

Key Characteristics of the 31NB-10020 Hydraulic Pump

Displacement 100 cubic centimeters per revolution (ccrev)

Control Type Single flow path (S) for a single hydraulic circuit

Pressure Rating High-pressure rating (specific value might vary depending on the model variant, but likely around 900 bar or 13,050 psi)

Potential Applications

While the exact applications can vary, the 31NB-10020 is often found in excavator models like

Hyundai R450-7 (sometimes alongside the K5V200DTH for larger R450LC-7 variants)

Komatsu PC290LC-7

Doosan DX290LC-5

Hitachi ZX290-5

Finding Specific Applications

To confirm if the 31NB-10020 is compatible with your specific excavator, consult your excavator's operator's manual or contact a Hyundai dealership. The manual will provide the exact model of the hydraulic pump used in your machine.

Maintenance and Replacement

Regular maintenance is crucial for the optimal performance and longevity of the 31NB-10020 hydraulic pump. Here are some general maintenance tips

Refer to the operator's manual It specifies the recommended type and viscosity of hydraulic oil, oil change intervals, filter replacement schedules, and fluid level checks.

Use high-quality hydraulic oil Following the manufacturer's recommendations ensures proper lubrication and protects the pump components.

Change the oil and filter regularly Clean oil and filters prevent contamination and maintain optimal performance.

Inspect the pump for leaks and damage Look for leaks, loose connections, or visible damage on the pump housing and surrounding components. Address any issues promptly to avoid further problems.

If the hydraulic pump needs replacement, opt for a genuine Kawasaki 31NB-10020 pump or a high-quality equivalent from a reputable manufacturer. Non-genuine replacements may compromise performance, reliability, and safety. Consult a qualified technician for pump replacement, as it involves specialized tools and procedures.

Safety Precautions

Hydraulic systems operate at high pressures and can cause serious injuries if not handled properly. Always follow safety procedures when working on the hydraulic system

Depressurize the system before any maintenance or repairs.

Wear appropriate personal protective equipment (PPE) such as gloves, safety glasses, and sturdy footwear.

Consult qualified technicians for complex procedures.

By following these tips, you can maintain the 31NB-10020 hydraulic pump in your excavator and ensure its optimal performance and longevity.

Additional Resources

Hyundai Excavator Operator's Manual This will provide detailed information on the hydraulic pump, including maintenance procedures and troubleshooting steps。

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