PLP20.16-03S1-L Casappa Gear Pump 16.85cc 300 bar

Product Overview

The PLP20.16-03S1-L/OC/20.16-LOG.OC-S7S, along with the PLP10, PLP20, PLP30, and PLM20 series, are high-performance aluminum external gear pumps from the Italian manufacturer CASAPPA POLARIS series. Founded in 1952 in Parma, Italy, CASAPPA is a globally recognized manufacturer of hydraulic pumps, motors, and gear flow dividers.

The PLP20 series belongs to Group 2 (medium frame) with displacements ranging from 4 to 31 cc/rev. This series features a 3-piece high-strength aluminum housing that delivers excellent heat dissipation and significant weight reduction, with continuous operating pressure of 250 bar and peak pressure up to 300 bar.

This model, PLP20.16-03S1-L/OC/20.16-LOG.OC-S7S, is a 3-section multi-pump (3 Section) combining three pump sections to deliver multiple independent flow outputs. It features SAE-A 2-bolt flange mounting, 9T 16/32 DP splined shaft drive, and left-hand (counter-clockwise) rotation. This pump is ideal for complex hydraulic systems requiring independent oil supply to multiple actuators.

Interchangeability: The PLP20 series is manufactured to exacting CASAPPA original design standards. Mounting flange, shaft type, port dimensions, and rotation direction are fully compliant with genuine CASAPPA specifications, enabling 100% drop-in replacement without any system modification.

Technical Specifications 

PLP20.16-03S1-L/OC/20.16-LOG.OC-S7S

• Brand: CASAPPA (Italy)

• Series: POLARIS PLP20

• Group: Group 2 (medium frame)

• Product type: 3-section multi-pump

• Displacement per section: 16.85 cm³/rev

• Continuous operating pressure: 250 bar

• Intermittent operating pressure: 280 bar

• Peak pressure: 300 bar

• Rated speed: 3,000 rpm

• Minimum speed: 500 rpm

• Rotation: Left-hand (counter-clockwise / CCW)

• Mounting flange: SAE-A 2-bolt, pilot Ø82.55 mm

• Shaft type: SAE J498 9T 16/32 DP splined shaft

• Ports: Side ports

• Seals: NBR (standard)

• Housing material: High-strength aluminum alloy

• End cover material: Aluminum

• Bearings: Sleeve bearings

• Recommended oil viscosity: 12 – 100 cSt

• Operating temperature range: -25°C to +80°C

• Recommended cleanliness: ISO 4406 19/17/14

• Net weight: Approx. 2.77 kg (single pump; multi-pump weight increases)

• Country of origin: Italy

Key Technical Advantages

1. 3-Piece High-Strength Aluminum Housing

The 3-piece aluminum housing design delivers exceptional structural integrity while significantly reducing pump weight. The aluminum material offers excellent thermal conductivity, rapidly dissipating operating heat to effectively lower fluid operating temperatures. Both the front flange and end covers are also made of aluminum for overall weight reduction.

2. Exceptional High-Pressure Capability

The PLP20 series delivers continuous operating pressure of 250 bar and peak pressure up to 300 bar. This high-pressure capability enables adaptation to demanding medium and high-pressure hydraulic system requirements.

3. Modular Multi-Pump Design

This model is a 3-section multi-pump (3 Section), combining three independent pump sections connected by a common drive shaft. Each section can be configured with independent or common suction, meeting diverse flow and pressure requirements of complex hydraulic systems without the need for additional drive sources.

4. Quiet Operation

The POLARIS series gear pumps feature optimized gear tooth profiles and precision machining, delivering low noise operation ideal for noise-sensitive work environments.

5. Sleeve Bearings and Aluminum End Covers

The gear shafts are supported by sleeve bearings, providing excellent wear resistance and impact durability. Precision-fitted aluminum end covers minimize internal leakage, maintaining stable volumetric efficiency across the full operating pressure range.

6. Extensive Configuration Options

The PLP20 series offers multiple displacement options (4, 6.3, 8, 11.2, 14, 16, 20, 25, 31 cc/rev), various flange types (SAE-A / German standard), multiple shaft types (splined / tapered 1:8 / 1:5), and various port configurations. Supports multi-pump combinations within the same series or across series (PLP10 + PLP20, PLP20 + PLP30).

Application Areas

• Injection Molding Machines – Independent oil supply to multiple actuators for precise injection, clamping, and ejection control

• Hydraulic Presses & Press Brakes – Staged pressure and flow output via multi-pump combinations

• Construction Machinery – Multi-circuit hydraulic systems for excavators, loaders, and other mobile equipment

• Material Handling Equipment – Forklifts, lifting platforms, and other handling machinery hydraulic systems

• Agricultural Machinery – Tractors, combine harvesters, and other agricultural equipment

• Industrial Hydraulic Power Packs – Machine tools, packaging machinery, and other stationary industrial equipment

• Multi-Pump Systems – Complex hydraulic systems requiring multiple independent flow outputs

Expert Maintenance Tips

1. Fluid Cleanliness Management

PLP20 series aluminum gear pumps are sensitive to fluid contamination. Recommended fluid cleanliness: ISO 4406 19/17/14 or higher. Install a suction filter with minimum 100 μm filtration and a return line filter with 10 μm filtration.

2. Fluid Viscosity & Temperature Control

Mineral-based hydraulic oils conforming to ISO/DIN standards are recommended. Operating viscosity should be maintained within 12 – 100 cSt. Optimal operating temperature: 40 – 60°C, with allowable range of -25°C to +80°C. For cold starts, ensure fluid temperature is above -10°C to prevent cavitation due to excessive viscosity.

3. Rotation Direction Verification

Always verify the pump rotation direction indicator before start-up (this model is L = left-hand/counter-clockwise). Start with jog operation to confirm correct rotation, then gradually load to operating pressure.

4. Alignment During Installation

Ensure concentricity between pump shaft and drive motor shaft does not exceed 0.05 mm, with angular misalignment within 0.5°. Flexible couplings are recommended to compensate for minor misalignment. SAE-A flange installation requires proper bolt torque according to specifications.

5. Multi-Pump Installation Considerations

Multi-pump sections are connected by internal splined drive shafts. Pay special attention to alignment and secure fastening between sections during installation. Suction lines for each section should be kept independent or symmetrically arranged to ensure uniform flow distribution.

6. First Start-Up and Bleeding

Before initial start-up, pre-lubricate the pump by filling clean hydraulic oil through the housing ports. After start-up, run the pump in no-load operation for a few seconds to ensure sufficient lubrication. The pump must be bled before building up system pressure. Never allow the pump to run without oil.

7. Periodic Maintenance

Replace hydraulic oil and filters every 2,000 operating hours or annually. Regularly monitor pump body temperature (surface temperature should not exceed 80°C) and listen for abnormal noise increases, which may indicate internal wear or cavitation. When servicing aluminum housing pumps, take extra care to avoid damaging sealing surfaces during disassembly.