PSVL2-27CG 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 PSVL2-27CG Charge Pump functions as an important low-pressure oil supply unit in hydraulic systems. It is designed to provide the main pump with stable charge flow and charge pressure. The pump operates 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.
The charge pump helps maintain favorable suction conditions for the main pump, supplies oil for system control circuits, and provides 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 pump ensures 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 NACHI PSVL2-27CG series axial piston main pumps, it is perfectly suitable for 20–30 ton medium-to-large excavators and other medium-sized hydraulic equipment. It adopts NACHI standardized mounting interface and special precision spline shaft design, 100% interchangeable with NACHI original spare parts, with easy disassembly and assembly, and strong universality in maintenance and replacement, fully matching the original equipment maintenance needs of medium-sized hydraulic systems.
High Precision & Stable Performance: Adopting high-strength ductile iron casing and high-hardness quenched alloy steel gears, combined with NACHI precision machining technology, it has excellent wear resistance, impact resistance and high temperature resistance, and can adapt to high dust, vibration, high temperature and long-term continuous medium-load working conditions of 20-30 ton medium-sized equipment in construction sites and mines. The built-in charge relief valve stably controls pilot pressure at 3.5–4.0 MPa, effectively preventing system overpressure damage and ensuring stable operation under long-term medium load.
Multi-Functional Integration & System Protection: It integrates three core functions: high-precision pilot control pressure supply, forced lubrication, and efficient oil replenishment, which is an indispensable auxiliary component for the normal operation of NACHI PSVL2-27CG series main pumps. It shares a common suction port with the main pump circuit, optimizes oil supply efficiency, effectively compensates for oil leakage of medium-sized hydraulic systems, 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 Adaptability: With integrated and compact design, it is reasonable in structure and stable in performance, perfectly matching the limited installation space of medium-sized hydraulic equipment such as 20–30 ton excavators. It can be directly mounted on NACHI PSVL2-27CG series main pumps without extra space, with high integration and strong adaptability, fully fitting the structural characteristics of medium-sized equipment.
Low Noise & Easy Maintenance: Optimized gear meshing and NACHI precision machining technology lower operating noise to ≤ 66 dB, providing a quieter working environment for medium-sized equipment operators. Standardized NACHI structural design makes daily maintenance simple: only regular inspection of oil cleanliness, oil level and seals, pump cleaning and filter replacement are needed. Long service life reaches more than 2800 working hours, effectively reducing maintenance cost and equipment downtime for medium-sized equipment.
Specifications
| Main Pump | displacement（cm3） | pressure（Mpa）Rated | pressure（Mpa）Peak | Shaft Type |
PSVL2-27CG | 2.7 | 3.5-4.0 | 5.0 | 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.
