K3V140DT 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 K3V140DT 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.
Integrated Design & Compact Structure: Integrated at the rear end of the K3V140DT main pump, coaxial drive eliminates the need for additional transmission components, saving installation space and improving transmission efficiency. The compact structure is perfectly adapted to the limited layout space of 30–35 ton class excavators, and the installation is convenient without complex assembly steps.
Stable Performance & High Reliability: Adopting fixed-displacement external gear pump structure, with simple principle, mature technology and strong anti-interference ability. The built-in pilot relief valve effectively limits the maximum pressure, avoids system overpressure damage, and ensures stable output of pilot pressure and lubricating oil flow, reducing failure rate.
Multi-Functional & Critical Role: It undertakes three core functions: providing pilot control pressure for the hydraulic system (driving main pump regulator, multi-way valve and other components), forced lubrication for internal parts of the main pump (bearings, slippers, valve plates), and replenishing oil leakage in the high-pressure side of the main pump to maintain circuit pressure and prevent cavitation, which is an indispensable component for the normal operation of the main pump
High Wear Resistance & Long Service Life: The pump casing is made of high-strength cast iron, and the gear is treated with quenching process, which has excellent wear resistance and impact resistance. The high-pressure wear-resistant seal ensures no oil leakage, and can withstand long-term heavy-load operation, significantly extending the service life under harsh working conditions such as mines and construction sites.
Strong Compatibility & Easy Maintenance: It is fully compatible with the original K3V140DT main pump, with good interchangeability of accessories. The standardized interface design facilitates quick disassembly, assembly and replacement. Daily maintenance only needs to check the oil level and oil cleanliness, which is simple and efficient, reducing equipment downtime.
Specifications
| Type | Model | displacement（cm3） | Shaft Type |
| Gear Pump | K3V140DT | other | Spline Shaft |
Applications
K3V140DT Charge Pump is mainly used as a supporting auxiliary component for the K3V140DT tandem main pump, and its primary application is the 30–35 ton class hydraulic excavators (open-circuit hydraulic systems). It is widely matched with mainstream excavator models worldwide, and can also be applied to other mobile construction machinery that requires stable pilot pressure and oil replenishment. Specific application scenarios and matching models are as follows:
Main Application: 30–35 ton class hydraulic excavators (core auxiliary component of hydraulic system)
Typical Excavator Models: Volvo EC290, EC300; Hyundai R290, R300-5; Doosan DH300-5; XCMG 335, SDLG 290, LiuGong
936; Sany 235, 280; Kobelco 330, 350
Other Mobile Machinery: Wheel loaders, crawler drills, pile drivers, rough-terrain cranes, concrete pump trucks, etc.
Axial piston variable 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.
Axial piston variable 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.
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.
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.
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.
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.
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.
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Europe(30.8%):Italy,Germany,England,Holland,Spain,Swiss,Finland,Russia,Poland.
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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.
