A4VG28 A4VG40 A4VG56 A4VG71 A4VG90 A4VG125 A4VG180 A4VG250 A4VG500 Hydraulic Charge Pump Manufacturers China Overview

As a professional hydraulic charge pump manufacturer in China, we supply high-quality replacement charge pumps compatible with A4VG series main pumps, including models A4VG28, A4VG40, A4VG56, A4VG71, A4VG90, A4VG125, A4VG180, A4VG250, and A4VG500.

Our products are engineered to deliver stable charge pressure, reliable oil supply, and long service life, making them an ideal solution for OEM replacement and aftermarket applications.

Core Features & Advantages

• Low Noise & High Efficiency：Optimized gear design ensures smooth operation, low noise, and high volumetric efficiency.

•  Improve Main Pump Stability：Provides stable charge oil flow to maintain proper lubrication and cooling of the main pump.

• Extend Hydraulic System Service Life：Reliable charge oil supply reduces wear and helps extend the lifespan of the hydraulic system.

• Multiple Control Options：Compatible with different hydraulic control systems to meet various application requirements.

A4VG28 A4VG40 A4VG56 A4VG71 A4VG90 A4VG125 A4VG180 A4VG250 A4VG500 Hydraulic Charge Pump Manufacturers China Circuit

As a leading hydraulic charge pump manufacturer in China, we provide complete charge pump circuit solutions compatible with A4VG series main pumps, including A4VG28, A4VG40, A4VG56, A4VG71, A4VG90, A4VG125, A4VG180, A4VG250, and A4VG500. Our circuit designs are engineered to ensure stable pressure control, efficient oil circulation, and long-term system reliability.

Specifications

Applications

1. Hydraulic drives with high pressure, heavy load, variability, large displacement, long service life, and reliability.

2. Steel metallurgy and forging machinery

3. Ceramic and refractory material presses

4. Shipping and hydroelectric systems

5. Rubber vulcanization and paper production

6. Petroleum equipment

7. Construction and mobile machinery

8. Railway and tunneling machines

Packaging & Delivery

Charge 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.

A4VG Series Hydraulic Charge Pump FAQ

1. What is the function of the A4VG series hydraulic charge pump?

The A4VG series hydraulic charge pump supplies low-pressure oil to the closed-loop system, maintains charge pressure, and compensates for internal leakage to ensure stable operation.

2. Which machines use A4VG28–A4VG500 charge pumps?

These charge pumps are widely used in excavators, wheel loaders, road construction equipment, mining machinery, and hydrostatic transmission systems.

3. What is the difference between A4VG28, A4VG40, A4VG56, A4VG71, A4VG90, A4VG125, A4VG180, A4VG250, and A4VG500?

The main differences lie in displacement and flow capacity. Larger models provide higher flow rates and are suitable for bigger hydraulic systems.

4. What type of pump is used in A4VG charge pumps?

A4VG charge pumps are typically gear-type pumps, offering a simple structure, reliable performance, and stable oil delivery.

5. Why is charge pressure important in A4VG systems?

Charge pressure prevents cavitation, ensures proper lubrication, and maintains system efficiency and responsiveness.

6. What are common signs of A4VG charge pump failure?

Common symptoms include low charge pressure, abnormal noise, overheating, slow machine response, and reduced system efficiency.

7. Can A4VG charge pumps be replaced with aftermarket alternatives?

Yes, high-quality aftermarket replacements are available as long as they match the original specifications such as mounting size, pressure rating, and displacement.

8. How to maintain an A4VG hydraulic charge pump?

Regular maintenance includes using clean hydraulic oil, replacing filters, checking seals and internal components, and maintaining proper oil levels and temperature.

Certifications & Quality Assurance

Charge 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.How does the variable displacement work?

The pump's flow is adjusted by changing the angle of an internal swash plate. As the swash plate angle changes, the stroke length of the pistons varies, which in turn changes the volume of fluid displaced per rotation, allowing the flow rate to adapt to the system's needs.

2.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.

3.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.

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

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

5.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.