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The Parker Commercial P20 and P21 series gear pumps are fixed-displacement, external-mesh gear pumps designed specifically for mobile hydraulic applications. Manufactured by Cissoko Hydraulic, these pumps feature a robust cast-iron construction and heavy-duty roller bearings, engineered to deliver reliable hydraulic power under demanding operating conditions.
The P20 and P21 series are particularly well-suited for a wide range of specialized vehicles—including tow trucks, salt and sand spreaders, hook-lift/roll-off trucks, sanitation vehicles, and bulk material handling systems—as well as other types of mobile hydraulic equipment. Available in various displacement sizes and mounting configurations, this series offers a flexible solution for truck manufacturers, hydraulic equipment suppliers, and diverse maintenance applications.
The Cisssoko P20/P21 series features a three-piece cast-iron construction, equipped with pressure-balanced thrust plates and heavy-duty roller bearings. The cast-iron housing ensures structural durability, while the balanced thrust plate design helps minimize internal friction and leakage. The roller bearings provide robust support for the shaft, enabling the units to withstand demanding operating conditions.
Another key feature of this series is the availability of both single and multiple-unit configurations. Tandem pumps can combine various gear sections, allowing for higher hydraulic flow rates from a single drive source. Furthermore, the series offers a wide range of shaft types, mounting flanges, and port configurations, ensuring compatibility with diverse power take-off (PTO) units and hydraulic system layouts.
In specific configurations, the P20/P21 series supports bi-directional rotation, offering greater flexibility for the integration of hydraulic systems.
| Parameter | Specification |
|---|---|
| Pump type | Fixed-displacement external gear pump |
| Series | PGP020 |
| Construction | Three-piece cast iron |
| Bearing type | Heavy-duty roller bearing |
| Displacement range | 16.1–64.6 cc/rev |
| Maximum continuous pressure | 207 bar (3,000 PSI), depending on size |
| Maximum speed | 2,400 rpm |
| Configuration | Single / Tandem / Multiple sections |
| Rotation | Clockwise / Counter-clockwise / Bi-rotational, depending on configuration |
| Mounting | SAE and other available configurations |
| Shaft options | SAE and other available configurations |
| Frame Size | Gear Width | Displacement | Maximum Continuous Pressure |
|---|---|---|---|
| 05 | 1/2 in | 16.1 cc/rev | 207 bar |
| 07 | 3/4 in | 24.2 cc/rev | 207 bar |
| 10 | 1 in | 32.3 cc/rev | 207 bar |
| 12 | 1-1/4 in | 40.4 cc/rev | 207 bar |
| 15 | 1-1/2 in | 48.4 cc/rev | 207 bar |
| 17 | 1-3/4 in | 56.5 cc/rev | 172 bar |
| 20 | 2 in | 64.6 cc/rev | 172 bar |
Pressure ratings vary according to gear width
The P20/P21 series is widely used in commercial vehicles and mobile hydraulic equipment. Typical applications include recovery and rescue vehicles, salt and sand spreaders, hook-lift trucks (roll-off dump trucks), refuse collection vehicles, bulk material handling systems, and various other types of service and utility vehicles. Featuring a cast-iron housing and rolling-element bearing construction, this series is ideally suited for applications that demand high durability and robust resistance to hydraulic fluid contamination.
When selecting an appropriate pump, it is necessary to verify parameters such as displacement, operating pressure, rotational speed, shaft configuration, mounting flange, port connections, and direction of rotation. The theoretical flow rate is determined by the pump's displacement and its rotational (drive) speed, calculated as follows:
Flow Rate (L/min) = Displacement (cc/rev) × Speed (rpm) ÷ 1,000
Actual flow will be lower due to volumetric losses. For tandem pump configurations, the gear sections and drive shaft must also be matched to the combined hydraulic load.
When replacing an existing P20 or P21 pump, the complete model code and physical configuration should be checked rather than selecting a replacement based on displacement alone.
Proper installation is essential for ensuring reliable equipment operation and extending its service life. Before installation, verify the mounting flange, shaft connection method, direction of rotation, port configuration, and drive speed. The suction line should be appropriately sized and free of unnecessary obstructions to ensure an adequate oil supply and prevent cavitation.
Use the correct hydraulic fluid, and maintain effective filtration and system cleanliness. During commissioning, check for issues such as oil leaks, abnormal noise, pressure instability, or excessive temperatures. Regular inspection of the hydraulic fluid, bearings, seals, and all connection points will help maintain pump performance and reduce unplanned downtime.
Cissoko provides hydraulic gear pump solutions for commercial vehicles, mobile machinery, and industrial hydraulic applications.
For customers looking for Parker P20, P21 replacement pumps, correct model identification is essential. Our team can help evaluate replacement requirements according to the original pump model, displacement, shaft type, mounting flange, rotation direction, and hydraulic port configuration.
Whether you need a replacement for an existing pump, a tandem gear pump assembly, or a hydraulic solution for new equipment, Cissoko can assist with identifying a suitable configuration based on your application requirements.
To help confirm the correct replacement, please provide the existing pump nameplate, product photos, or complete model code.
As a customer, you can trust Cissoko Hydraulic for the following reasons:
Our factory has 3 branches,located in Changzhou, Shandong and Zhejiang respectively,covering a total area of 8000 square meters.
Top Leading Hydraulic pump Manufacturer
Our piston pumps, gear pumps, hydraulic cylinders, and other components are built to last. We utilize the latest technology and rigorous testing methods to ensure all products meet international quality standards.
Hydraulic Pump & Hydraulic Piston Pump & Hydraulic Motor & Hydraulic Vane Pump Factorys - Cissoko Hydraulic
We are proud to serve over 60 countries worldwide, providing first-class hydraulic solutions globally. Our products are trusted in regions such as the United States, Germany, Brazil, Russia, and Southeast Asia.
Customized Services:
Need a specific product?
We offer OEM and ODM services, allowing us to customize hydraulic components to your specific needs.
Cissoko Hydraulic is ISO9001 certified, CE certified, and complies with EU RoHS standards. This ensures all our products meet the highest global quality and safety standards. In addition, some of our products are UL certified, further enhancing reliability.
Cissoko Hydraulic Patent Certificate
We provide ongoing technical support and after-sales service to ensure your system always performs at its best.
hydraulic Pump manufacturer - Cissoko Hydraulic
Once your product is manufactured and confirmed with you, it will be packaged and shipped within 6 hours.
By understanding how hydraulic piston pumps work and why Cissoko Hydraulic is the trusted choice for hydraulic components, you can make informed decisions that enhance the performance and reliability of your systems.
