The Casappa PLP20-20D-82E2-GEGD is a high-performance hydraulic gear pump from the renowned Italian manufacturer Casappa. This model belongs to the robust PLP series, engineered for demanding applications requiring reliability under high pressure. With a displacement of 20 cm³/rev and a capability to handle pressures up to 300 bar, this pump is designed for a wide range of mobile and industrial machinery. Its construction emphasizes durability and efficiency, making it a preferred choice for system integrators seeking a balance of performance and longevity in challenging environments.

Brand Heritage: Casappa

Casappa, with a heritage dating back to 1952, is a respected name in the fluid power industry, specializing in the design and manufacture of hydraulic pumps, motors, and complete systems. The company has built a reputation for innovation, quality, and providing tailored solutions.

The PLP series exemplifies Casappa's commitment to robust design and technical excellence. Globally, Casappa is recognized as a reliable partner for demanding applications in sectors like construction, agriculture, and industrial automation, offering a compelling alternative through a high performance-to-cost ratio and strong technical support.

How a Hydraulic Gear Pump Works

A hydraulic gear pump is a type of positive displacement pump that serves as the workhorse of many hydraulic systems. It operates on a simple yet effective principle:

Two meshing gears—a driven gear and an idler—rotate inside a tightly toleranced housing. As the gears unmesh, they create a vacuum at the inlet port, drawing fluid into the pump. The fluid is then carried between the gear teeth and the housing to the outlet port, where the meshing of the gears forces the fluid out, creating flow and pressure.

This simplicity translates into key advantages: compactness, cost-effectiveness, robustness, and superior resistance to contamination compared to more complex pump types like piston or vane pumps.

Key Features & Technical Specifications

The PLP20-20D-82E2-GEGD is engineered for heavy-duty performance with the following features:

High-Pressure Operation: Rated for continuous operation up to 300 bar (4350 psi), suitable for high-force applications.

Robust Construction: A three-piece design comprising a high-strength aluminum alloy cover, center section, and flange ensures structural integrity and dimensional stability.

Heavy-Duty Bearing System: Integrated external bearings are designed to withstand substantial radial loads, significantly extending service life.

High-Speed Capability: Operates at speeds up to 4000 RPM, providing flexibility in system design.

Standardized Mounting: Conforms to SAE and other international mounting and porting standards for easy integration.

Technical Specifications

Model Code    PLP20-20D-82E2-GEGD    

Displacement    20 cm³/rev (1.22 in³/rev)    

Max Operating Pressure    300 bar (4350 psi)    

Peak Pressure    350 bar (5075 psi)    

Max Speed    4000 rpm    

Rotation    Typically clockwise (CW) or counter-clockwise (CCW) - specified by order code    

Fluid Type    Mineral-based hydraulic oils to specified ISO viscosity grades    

Construction    Three-piece, high-strength aluminum alloy    

Mounting    SAE "C" 2-bolt flange    

Performance and Materials

This pump delivers high volumetric efficiency, ensuring maximum flow output for its size. Precision-machined gears and optimized clearances maintain this efficiency across a wide viscosity range.

Housing: Made from high-strength aluminum alloy, offering an excellent strength-to-weight ratio and corrosion resistance.

Gears: Manufactured from case-hardened steel for superior wear resistance and long-term durability.

Shaft: Constructed from hardened steel to handle high torsional and radial loads.

Applications & Industries

This versatile pump is deployed across numerous sectors:

Mobile Machinery: Excavators, loaders, telehandlers, agricultural tractors, and harvesters.

Industrial Machinery: Plastic injection molding machines, machine tools, presses, and conveyor systems.

Material Handling: Forklifts, aerial work platforms, and log splitters.

Value Proposition

Proven Reliability: Quality materials and precision engineering ensure a long operational life.

High Power Density: Delivers significant hydraulic power from a compact and lightweight unit.

Global Serviceability: Widespread distributor network ensures ready availability of parts and support.

Cost-Effectiveness: Offers a compelling total cost of ownership through durability and efficiency.

Frequently Asked Questions (FAQs)

1. What is the key advantage of the PLP series design?
The key advantage is its robust three-piece construction and heavy-duty external bearing system. This design provides superior structural integrity under high pressure and excels at handling substantial radial loads, leading to exceptional durability and a longer service life.

2. How does the displacement (20 cm³/rev) affect my system?
Displacement defines the pump's flow output per revolution. At a given speed, this 20 cm³/rev pump delivers a specific flow rate, which directly impacts actuator speed. A larger displacement would make cylinders and motors operate faster, assuming other system parameters remain constant.

3. Where is a 300 bar high-pressure pump required?
This high pressure is essential for generating high forces from compact actuators. It is common in mobile machinery (e.g., excavator booms), industrial applications (e.g., injection molding clamps, metal presses), and anywhere significant power must be transmitted through a limited space.

4. Why are the external bearings important?
The integrated external bearings are critical for durability. They absorb and manage high radial loads from belts, couplings, or internal forces. This protects internal components, minimizes shaft deflection, and is a primary reason for the pump's long lifespan in tough applications.

5. Is this pump suitable for industrial applications?
Absolutely. While ideal for mobile equipment, its high-pressure capability, robustness, and standardized mounting make it perfectly suited for industrial environments like machine tools, industrial robots, and plastic injection molding machines.

6. What maintenance does this gear pump require?
Maintenance is minimal but critical. It primarily involves using clean, properly specified hydraulic fluid and maintaining the filtration system. Periodically check for external leaks, unusual noise, or performance drops. It has no internal valves requiring regular adjustment.