KZP4/KRP4 Internal Hydraulic Gear Pump

KZP4/KRP4 Internal Hydraulic Gear Pump Overview

KZP4/KRP4 Internal Hydraulic Gear Pump is a high-performance, fixed-displacement tandem internal gear pump engineered for compact hydraulic systems requiring dual-circuit power with exceptional efficiency and reliability. Built on a shared drive shaft with integrated dual pump sections, it delivers independent flow outputs for two separate hydraulic functions, offering a high power-to-space ratio ideal for mobile machinery, injection molding machines, and servo hydraulic systems where footprint and performance are critical.

Features and Benefits

• Dual-Circuit Power Integration

  Built as a tandem pump with shared drive shaft, it delivers independent flow for two hydraulic functions, enabling compact dual-circuit system designs with high power density.
• High Efficiency & Low Pulsation Performance

  Advanced internal gear profile ensures smooth fluid delivery, minimizing flow ripple and pressure fluctuations for consistent, energy-efficient operation.
• Compact & Installation-Friendly Design

  Space-saving footprint allows easy integration into tight equipment layouts, while standardized mounting interfaces simplify replacement and maintenance.
• Versatile Application Compatibility

  Ideal for mobile machinery, injection molding equipment, and servo hydraulic systems, meeting the demands of both industrial and mobile hydraulic applications.
• Robust Build for Extended Durability

  Precision-machined components and wear-resistant materials ensure reliable performance under continuous high-pressure operation, extending overall system service life.

Model Codes

gear pump.pdf

Applications

The KZP4/KRP4 Internal Hydraulic Gear Pump provides reliable and efficient hydraulic performance for industrial and mobile systems requiring stable pressure, compact structure, and durable operation:

• Construction Machinery: Suitable for loaders, excavators, and road construction equipment, supplying stable hydraulic power for lifting and steering systems.

• Agricultural Equipment: Widely used in tractors, harvesters, and spraying machinery for hydraulic transmission and auxiliary functions.

• Industrial Hydraulic Systems: Applied in hydraulic presses, machine tools, and automated production equipment requiring continuous and smooth oil flow.

• Material Handling Equipment: Ideal for forklifts, lifting platforms, and warehouse machinery operating under varying load conditions.

• Mobile Hydraulic Vehicles: Installed in dump trucks, sanitation vehicles, and utility trucks to support tipping and hydraulic control systems.

• Hydraulic Power Units: Suitable for compact hydraulic stations and power packs requiring reliable, low-noise, and high-efficiency hydraulic performance.

  
  

Packaging & Delivery

KZP4/KRP4 Internal Hydraulic Gear Pumps are typically packaged securely to prevent damage during transit. The packaging includes:

Protective Wrapping: To safeguard the pump from environmental damage.

Custom Crates: For larger, heavier pumps, ensuring safe handling.

Documentation: Includes installation, maintenance instructions, and warranty details.

Delivery time depends on the model, customizations, and location but typically ranges from 2 to 6 weeks from the order date.

KZP4/KRP4 Internal Hydraulic Gear Pump FAQ:

1. What is the KZP4/KRP4 Internal Hydraulic Gear Pump?

The KZP4 / KRP4 are high‑pressure external gear pumps, widely used as OEM or replacement parts for forklifts and construction machinery. Built with high‑strength aluminum alloy housing and advanced gear technology, they deliver reliable, efficient performance in compact mobile hydraulic systems.

2. What makes the KZP4/KRP4 Series different from standard gear pumps?

• Tandem Dual-Circuit Design: Built as a single unit with two independent pump sections on one shaft, delivering two separate flow outputs for multi-function hydraulic systems.

• High Power Density: Compact structure packs dual-pump functionality into one housing, saving installation space and simplifying system layout.

• Optimized Efficiency for Servo Systems: Precision internal gear profile minimizes internal leakage, supporting high-efficiency operation in energy-saving servo hydraulic applications.

• Integrated Pressure Stability: Smooth fluid delivery with low pulsation ensures consistent performance for both main and auxiliary hydraulic circuits.
  
  

3. What is the working pressure range of KZP4/KRP4 pumps?

The KZP4/KRP4 Series is suitable for medium and high-pressure hydraulic systems:

• Continuous Pressure: Up to 21 MPa (≈ 3050 PSI).

• Maximum Pressure: Up to 25 MPa (≈ 3600 PSI).
  It is widely used in industrial machinery, construction equipment, and agricultural systems.

  
  

4. Can KZP4/KRP4 pumps replace other brands?

Yes, the KZP4/KRP4 Series can replace many standard internal gear pumps, including:

• Parker Gear Pumps

• Rexroth Internal Gear Pumps

• Nachi Hydraulic Pumps
  Please confirm shaft type, mounting dimensions, and displacement before replacement.

  
  

5. What hydraulic oil is recommended for KZP4/KRP4 pumps?

For stable performance and long pump life:

• Oil Type: Anti-wear hydraulic oil (AW type).

• Viscosity: ISO VG32–VG68 recommended.

• Filtration: Use filtered, clean oil to minimize component wear and ensure long-term reliability.
  
  

6. What is the typical speed range of KZP4/KRP4 pumps?

The KZP4/KRP4 Series is designed for flexible hydraulic applications:

• Minimum Operating Speed: 600 RPM

• Recommended Continuous Speed: 800–2500 RPM

• Maximum Intermittent Speed: Up to 3000 RPM (subject to displacement and system pressure conditions)

  This range balances performance, efficiency, and durability for typical hydraulic system requirements.

7. Do you provide OEM or customized services?

Yes, we support OEM and customization, including nameplate, packaging, and specific performance requirements. Send us your drawings or specifications for evaluation.

8. How can I get a quotation quickly

Please provide the following details:

• Model or displacement

• Working pressure

• Speed

• Quantity
  We will reply within 12 hours with a competitive quotation.

  
  

Certifications & Quality Assurance

KZP4/KRP4 Internal Hydraulic Gear Pumps are manufactured in compliance with international standards, ensuring high performance and reliability:

ISO 9001: Certified for quality management systems.

CE Certification: Ensures compliance with European safety, health, and environmental protection standards.

RoHS Compliance: Ensures the pump does not contain hazardous materials.

Factory Testing: Every pump is rigorously tested for performance, pressure, and leak integrity before shipping.

FAQ

1.What's our advantages?

Factory established in 2005;

With a great deal of production experience;

80+ employees become the professional team;

Constant updated ERP system ensure efficiency of work;

Sophisticated equipment ehanced the accuracy of products;

Professional salesmen provide the greast service;

With a large number of famous customers all over the world;

Great after-sales service;

With the long term cooperation with famous logistics and express company in China,provide the better goods service.

2.What is your payment terms?

Small order/sample order,full payment in advance; Big orders send the first payment 30% before the production,and the balance before shippment.We'll show the photos of the products and packages before delivery.

3.Can you make my own brand on the products?

Of course we can. Just send me your logo  we can make it for you.

4.What is our main export market?

America(40.5%):USA, Canada, Argentina, Brazil

Europe(30.8%):Italy,Germany,England,Holland,Spain,Swiss,Finland,Russia,Poland.

Asia(23.5%):Korea,singapore,India,Turkey,Vietnam,Saudi Arabia,Syria, Israel,Lebanon.

Others(5.8%).

The Green hydraulic pump manufacturing facility is a specialized industrial plant that focuses on producing hydraulic pumps and related components. These factories are equipped with advanced machinery and technology to fabricate high-quality pumps designed for a wide range of applications, from heavy equipment and machinery to automotive and industrial systems.

The production process typically involves precision engineering, where raw materials like metals and alloys are processed into pump components such as gears, pistons, cylinders, and seals. These parts are then assembled into fully functional hydraulic pumps, which are tested for performance and quality control to ensure reliability, efficiency, and durability under various working conditions.

Green Hydraulic's manufacturing facilities for hydraulic pumps maintain stringent quality standards, often adhering to international certifications, to meet the expectations of customers in industries such as construction, agriculture, automotive, and manufacturing.

All hydraulic pumps produced by Green Hydraulic have undergone compliance testing, ensuring their quality and reliability.

To meet the diverse needs of different industries, the green hydraulic offer customization options, such as specialized seals, materials, and pump configurations. These facilities often work closely with engineering teams to develop tailored solutions for specific applications, from high-pressure systems to low-flow, high-efficiency pumps.

Each pump undergoes a rigorous quality control process, where pressure tests and performance assessments are conducted to ensure that the pumps meet the required standards for flow rate, pressure capacity, and durability.