AP12 Hydraulic Charge Pump

 AP12 Hydraulic Charge Pump Overview

Core Features & Advantages

• Stable and Reliable Charging PerformanceThe AP12 charge pump adopts precision gear transmission structure, which can output continuous and stable charging flow and pilot pressure during operation. It effectively supplements oil for the main hydraulic pump, eliminates system pressure fluctuation, prevents cavitation phenomenon, and ensures the continuous and stable operation of the entire hydraulic system under heavy-load and long-time working conditions.
  Excellent Wear Resistance and Long Service LifeThe pump body is made of high-strength cast iron, and the internal gears and shaft parts are processed with high-precision finishing and heat treatment technology. The overall structure features high rigidity, strong impact resistance and outstanding wear resistance. It can adapt to harsh construction working environments with dust, high load and frequent startup, greatly reducing component failure rate and extending the service life of hydraulic equipment.

• Compact and Integrated Structure for Easy InstallationFeaturing miniaturized and lightweight integrated design, the AP12 charge pump occupies a small installation space with a simple and matching assembly structure. It is highly compatible with CAT series excavator hydraulic main pumps, realizing quick disassembly and replacement without complex modification, which effectively improves maintenance efficiency and saves installation and maintenance costs.

  Superior Sealing Performance, No Oil LeakageEquipped with high-quality wear-resistant and oil-resistant sealing components, the pump maintains excellent sealing performance under variable pressure and temperature working conditions. It effectively avoids hydraulic oil leakage and external dust pollution, ensures the cleanliness of the internal hydraulic system, and reduces oil consumption and equipment maintenance troubles.

  Low Vibration and Low Noise OperationWith optimized gear meshing design and precise assembly process, the pump operates smoothly with low vibration and low noise during high-speed operation. It avoids abnormal noise and system jitter caused by unstable oil supply, improving the overall operating comfort and stability of construction machinery.

  Strict OEM Standard CompatibilityManufactured in full accordance with original factory specification standards, the AP12 charge pump has completely matched displacement, pressure parameters and installation dimensions. It can be used as a direct OEM replacement part with strong versatility, stable adaptability and no system mismatch failure.

  Strong System Protection CapabilityAs a dedicated supporting accessory for the hydraulic main pump, it provides continuous oil supply and circulating lubrication for the main pump core components. It effectively prevents dry friction and abrasion of internal parts, plays a key protective role for the hydraulic main pump and entire system, and reduces the failure risk of expensive hydraulic components.

AP12 Charge Pump Hydraulic Circuit

The AP12 charge pump hydraulic circuit is a vital auxiliary system designed to provide a stable low-pressure oil supply for the main hydraulic pump. Its primary function is to maintain proper inlet pressure, support lubrication of internal components, and ensure effective cooling, thereby enhancing the reliability and efficiency of the hydraulic system.

Specifically engineered for AP12 series systems, this circuit ensures the main pump operates smoothly under both normal and heavy-duty conditions, preventing cavitation and oil starvation.

Specifications

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

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.

AP12 Hydraulic Charge Pump FAQ

1.Do I need to install the AP12 Charge Pump separately? What should I pay attention to when replacing it?

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 AP12 Charge Pump for the first time?

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 AP12 Charge Pump?

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  AP12 Charge Pump be reversed? What are the consequences of reverse rotation?

Reverse rotation of the AP12 charge pump is strictly forbidden. Running in opposite direction will cut off normal oil delivery, bring about pressure drop and severe cavitation inside the pump. It will also aggravate internal parts abrasion, affect hydraulic control response and finally cause permanent damage to the pump and related system components.

5. Is the AP12 Charge Pump a dedicated accessory? Can it work normally without it?

6.Can the displacement of the AP12 Charge Pump be replaced arbitrarily?

The displacement of the AP12 charge pump cannot be replaced at will. It has to adopt the exact specification matching the original equipment. Improper displacement will disrupt hydraulic pressure balance, result in inadequate oil supply and poor lubrication, and bring malfunctions and irreversible damage to the whole hydraulic system.

Certifications & Quality Assurance

AP12 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.