A8VO120/140 Charge Pump
Green Hydraulic
Yes
ISO9001，CE
1. Industrial Hydraulic Systems 2. Mobile Equipment (Industrial Vehicles) 3. Construction and Engineering Machinery 4. Metallurgy Industry
spline shaft
1 set
Product Description
The A8VO120 / A8VO140 Charge Pumps function as important low-pressure oil supply units in hydraulic systems. They are designed to provide the main pump with stable charge flow and charge pressure. The pumps operate based on the principle of volumetric hydraulic transmission, where the meshing rotation of external gears changes the volume of sealed working chambers, enabling continuous suction and discharge of hydraulic oil.
These charge pumps help maintain favorable suction conditions for the main pump, supply oil for system control circuits, and provide necessary lubrication and cooling for key internal components. When the main pump high-pressure circuit operates under long-term high-pressure and heavy-load conditions, the charge pumps ensure a stable charge pressure supply, helping prevent cavitation and insufficient oil supply. This reduces wear and potential damage to critical components such as the pistons, bearings, and valve plate, ensuring stable and efficient operation of the entire hydraulic system, extending equipment service life, and reducing maintenance costs.
Strong Versatility & High Compatibility: Specially developed for Rexroth A8VO120, A8VO140 series main pumps, it is perfectly suitable for 15-30 ton class large and medium-sized excavators, cranes and other heavy hydraulic equipment. It supports two configurations: with and without additional pressure-reduction valve, meeting the functional needs of different heavy-duty equipment. It is 100% interchangeable with original spare parts, with standardized installation interface, convenient disassembly and assembly, and strong universality in maintenance and replacement.
Stable Performance & Reliable Operation: Adopting high-quality ductile iron casing and quenched alloy steel gears, it has excellent wear resistance, impact resistance and high temperature resistance, and can adapt to high temperature, high dust, high vibration and long-term overload working conditions on construction sites and mines. The built-in charge relief valve stably maintains the pilot pressure in the range of 3.2–3.8 MPa, effectively preventing system overpressure damage and ensuring stable operation of the hydraulic system under long-term heavy-load operation.
Multi-Functional Integration & System Protection: It integrates three core functions: providing pilot control pressure, forced lubrication and oil replenishment, which is an indispensable auxiliary component for the normal operation of the main pump. It shares a common suction port with the main pump circuit, optimizes oil supply efficiency, effectively supplements oil leakage, prevents cavitation of the main pump, reduces wear of internal precision components, and extends the service life of the main pump and the entire hydraulic system.
Compact Structure & Excellent Power-to-Weight Ratio: The integrated design makes the product compact and small in size, which is perfectly adapted to the limited installation space of large and medium-sized hydraulic equipment. It is suitable for direct installation on the flywheel case of diesel engines, with excellent power-to-weight ratio, efficient and practical, and does not occupy additional installation space.
Low Noise & Easy Maintenance: The optimized gear meshing design and precision processing technology reduce the noise during operation, and the noise value is ≤ 70dB, creating a comfortable operation environment. The standardized structural design simplifies daily maintenance. It only needs to regularly check the oil cleanliness, oil level and seal integrity, clean the pump body and replace the filter element. The product has a long service life, and the average service life can reach more than 2500 working hours under standard use and regular maintenance, effectively reducing maintenance costs and equipment downtime.
Specifications
| Type | Model | displacement（cm3） | Shaft Type |
| Gear Pump | A8VO120/A8VO140 | oher | Spline Shaft |
Applications
Hydraulic drives with high pressure, heavy load, variability, large displacement, long service life, and reliability.
Steel metallurgy and forging machinery
Ceramic and refractory material presses
Shipping and hydroelectric systems
Rubber vulcanization and paper production
Petroleum equipment
Construction and mobile machinery
Railway and tunneling machines
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.
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.
Charge Pump FAQ
A: No, it is integrated with the main pump and does not require separate installation. When replacing, ensure that the spline shaft is accurately aligned with the main pump drive shaft, tighten the fixing screws with a torque wrench, keep the contact surface flat and free of impurities, and use a seal ring of the correct size to ensure sealing performance.
2.What preparations are needed before starting the Charge Pump for the first time?
A: Manually fill the charge pump with clean hydraulic oil through the drain port to empty the internal air and avoid dry running damage. Jog start several times to confirm that the rotation direction is clockwise (when viewed from the shaft end), and there is no abnormal sound or oil leakage before formal operation. In addition, manually turn the main shaft to check the self-priming condition of the charge pump.
3.What are the requirements for hydraulic oil when using the Charge Pump?
A: The cleanliness of hydraulic oil must meet the ISO 18/15 standard, and the oil temperature should be kept between 15–65℃. It is recommended to regularly replace hydraulic oil and filters; under harsh working conditions such as mines and high dust, the replacement cycle should be shortened to avoid component wear caused by oil pollution.
4. Can the rotation direction of the Charge Pump be reversed? What are the consequences of reverse rotation?
A: No, it cannot be reversed; its rotation direction is the same as that of the main pump. Reverse rotation will cause no oil delivery, system pressure loss, internal gear wear, and even damage to the pump body and the main pump. When installing, pay attention to the chamfer direction of the gear rotor to avoid reverse installation.
5. Is the Charge Pump a dedicated accessory? Can it work normally without it?
A: It is a dedicated charge pump for the main pump and cannot be used universally with other models. The main pump cannot work normally without it, which will cause serious damage to the internal components of the main pump and affect the service life of the entire hydraulic system.
6.Can the displacement of the Charge Pump be replaced arbitrarily?
A: No, it cannot. The standard displacement is 12 cm³/rev; replacing it with other displacements (10/14 cm³/rev) without authorization will lead to insufficient or too high pilot pressure, abnormal lubrication flow, and early wear of the main pump. The displacement should be selected according to the actual working conditions of the equipment.
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.
We are a manufacture for vane pumps。.We are located in Changzhou City, Jiangsu Province, China.Welcome to visit us.
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.
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.
Of course we can. Just send me your logo we can make it for you.
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.
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.
