P50/P51 PARKER P Pump Gear

P50/P51 SERIES Gear Pump  Overview

The Parker P50/P51 is a robust, fixed-displacement gear pump engineered for heavy-duty mobile and industrial hydraulic systems that demand proven reliability, high-pressure performance, and long service life. Built to thrive in demanding applications, these pumps feature a compact, power-dense design optimized for direct integration with truck Power Take-Offs (PTOs) and mobile equipment where space efficiency and consistent performance are mission-critical.

Features and Benefits

• Heavy-Duty Cast Iron Construction:

  The P50/P51 series is built with high-strength cast iron bodies, covers, and wear components, delivering exceptional structural rigidity compared to lightweight alternatives. This rugged design minimizes deflection under high-pressure loads, reduces mechanical fatigue, and ensures stable, leak-free operation even in harsh, continuous-duty work environments.
• Advanced Bushing-Style Design:

  Utilizing precision-machined, pressure-balanced bushings instead of conventional roller bearings, the P50/P51 maximizes bearing surface area for superior load distribution in high-pressure operations. This design offers excellent tolerance to fluid contamination and thermal shock, maintaining high volumetric efficiency while preventing premature wear during extended, intensive use.
• Pressure-Compensated Wear Plates:

  Equipped with precision axial compensation technology, the P50/P51 features pressure-balanced wear plates that automatically adjust internal clearances between gear faces and the housing. This minimizes internal fluid bypass and friction loss, ensuring consistent mechanical efficiency and reliable power delivery across the full operating temperature range.
• High-Pressure Performance Capability:

  Despite its compact footprint, the P50/P51 is engineered to handle continuous operating pressures up to 3,000 psi (207 bar) (peak pressures up to 3,500 psi / 241 bar). Its hardened alloy steel gears and precision-machined components deliver smooth, consistent flow to power high-force actuators and complex hydraulic circuits with dependable performance.
• Modular Versatility and Installation Flexibility:

  The P50/P51 series offers a versatile range of displacements (from 10 to 50 cc/rev) and supports standard SAE "A" and "B" mounting configurations, making it compatible with a wide range of PTO and equipment setups. With dual-porting options featuring both side and rear ports, these pumps provide unmatched installation flexibility for cramped chassis environments and specialized mobile applications.

Model Codes

Applications

Packaging & Delivery

P50/P51 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.

P50/P51 Gear Pump  FAQ

1. What are P50/P51 series gear pumps

2. What is the difference between the P50 and P51 series pumps

Yes, we support OEM and customization, including nameplate, packaging, and specific performance requirements. Send us your drawings or specifications for evaluation.

8. How can I get a quotation quickly

Please provide the following details:

• Model or displacement

• Working pressure

• Speed

• Quantity
  We will reply within 12 hours with a competitive quotation.

  
  

Certifications & Quality Assurance

P50/P51 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.