890-EI-0500-RS2-C302 Eckerle Gear Pump | 50cc 320 bar Internal Gear

Product Overview

The 890-EI-0500-RS2-C302 and 890-EI-0320-RS2-C302 are representative models of the German ECKERLE 890-EI series high-pressure internal gear pumps. ECKERLE is the inventor of the internal gear pumpand has established an outstanding technical reputation in the global hydraulics industry since its founding in 1935.

The 890-EI series belongs to ECKERLE’s EIPH (High-Pressure Series) and EIPC (Compact High-Pressure Series) product platforms. The series features innovative radial and axial pressure compensation design, combined with a patented two-piece eccentric gap-filling design that enhances radial pressure compensation effectiveness. The suction and pressure ports are arranged at 180° for convenient system piping connections.

The 890-EI-0500-RS2-C302 offers 50 cc/rev displacement, while the 890-EI-0320-RS2-C302 offers 32 cc/rev displacement. Both models deliver a maximum working pressure of 320 bar, representing the new-generation EIPC series technology. Every unit undergoes 100% workload simulation testing prior to shipment, rigorously validating pressure retention, volumetric efficiency, and internal leakage performance to meet or exceed OEM standards.

Model Code Breakdown (Bulleted List) :

890-EI-0500-RS2-C302

• 890 — Product platform series code

• EI — Internal Gear Pump series identifier

• 0500 — Displacement code: 50 cc/rev (nominal displacement)

• RS2 — Shaft and mounting configuration code

• C302 — Specific control/seal/pressure level configuration code

890-EI-0320-RS2-C302

• 890 — Product platform series code

• EI — Internal Gear Pump series identifier

• 0320 — Displacement code: 32 cc/rev (nominal displacement)

• RS2 — Shaft and mounting configuration code

• C302 — Specific control/seal/pressure level configuration code

Technical Specifications 

890-EI-0500-RS2-C302

• Model: 890-EI-0500-RS2-C302

• Brand: ECKERLE

• Series: EIPH / EIPC Series Internal Gear Pump

• Displacement: 50 cc/rev (nominal)

• Maximum Working Pressure: 320 bar

• Maximum Transient Pressure: Up to 400 bar

• Material: Cast iron / Aluminum (depending on configuration)

• Noise Level: < 66 dB (low-noise design)

• Pressure Pulsation: < 2% (low pulsation)

• Suction & Pressure Port Angle: 180°

• Pressure Compensation: Radial and axial pressure compensation

• Recommended Media: Hydraulic oil

• Country of Origin: Germany

890-EI-0320-RS2-C302

• Model: 890-EI-0320-RS2-C302

• Brand: ECKERLE

• Series: EIPH / EIPC Series Internal Gear Pump

• Displacement: 32 cc/rev (nominal)

• Maximum Working Pressure: 320 bar

• Maximum Transient Pressure: Up to 400 bar

• Material: Cast iron / Aluminum (depending on configuration)

• Noise Level: < 66 dB (low-noise design)

• Pressure Pulsation: < 2% (low pulsation)

• Suction & Pressure Port Angle: 180°

• Pressure Compensation: Radial and axial pressure compensation

• Recommended Media: Hydraulic oil

• Country of Origin: Germany

Key Technical Advantages

1. Core Technology from the Inventor of the Internal Gear Pump
ECKERLE is the inventor of the internal gear pump and holds the foundational patents for this technology. The 890-EI series inherits over half a century of technological accumulation and continuous innovation, representing the cutting edge of internal gear pump technology.

2. Radial and Axial Pressure Compensation Design
The radial and axial pressure compensation design, combined with a patented two-piece eccentric gap-filling structure, effectively enhances radial pressure compensation performance. This design enables the pump to maintain extremely low internal leakage even under high pressure, significantly improving volumetric efficiency.

3. Ultra-Low Noise and Ultra-Low Pulsation Operation
Noise levels are below 66 dB, with pressure pulsation below 2%. The inherent low-noise, low-pulsation characteristics of internal gear pumps make them ideal for applications with stringent noise and pressure stability requirements, such as injection molding machines and die casting machines.

4. Superior High-Pressure Capability
Maximum working pressure reaches 320 bar, with transient pressures up to 400 bar. ECKERLE’s high-pressure internal gear pump technology redefined the historical limitation of gear pumps to medium and low-pressure applications, and the 890-EI series fully embodies this technological advantage.

5. Wide Displacement Coverage & Flexible Configuration Options
The 890-EI series offers displacements ranging from 32 cc/rev to 160 cc/rev and beyond. Multiple shaft and mounting configurations (RS2, RK2, etc.) and control/seal configurations (C302, C313, C311, etc.) are available to suit diverse application requirements.

6. OEM-Proven Reliability & 100% Factory Testing
The ECKERLE 890-EI series is widely used as OEM components in injection molding machines, die casting machines, press brakes, punch presses, and other industrial machinery. Every unit undergoes 100% workload simulation testing prior to shipment, covering pressure retention verification, internal leakage detection, and flow validation—ensuring every unit meets design performance standards.

Application Areas

The 890-EI-0500-RS2-C302 and 890-EI-0320-RS2-C302 internal gear pumps are widely used in the following equipment:

• Injection Molding Machines: Stable, low-pulsation hydraulic power for injection, clamping, and other processes

• Die Casting Machines: High-pressure, high-flow hydraulic systems requiring low noise and high pressure stability

• Press Brakes: Precise pressure and position control

• Punch Presses: Reliable hydraulic power under high impact loads

• Servo Energy-Saving Systems: On-demand oil supply with servo drive for energy-efficient operation

• Hydraulic Machinery: Various industrial hydraulic equipment

• Stackers and Construction Vehicles: Mobile hydraulic equipment

Expert Maintenance Tips

1. Model Confirmation
890-EI-0500-RS2-C302 and 890-EI-0320-RS2-C302 have different displacements (50 cc/rev vs 32 cc/rev). Before installation, confirm the correct displacement based on system flow requirements and verify the complete model code on the pump nameplate.

2. Rotation Direction Confirmation
The ECKERLE 890-EI series supports multiple rotation direction configurations. Before installation, always verify that the PTO rotation direction of the host machine matches the pump’s rotation direction—incorrect rotation will result in pump failure to prime and may cause severe damage to internal components within a short period.

3. Installation Precautions

• Thoroughly clean the mounting flange and shaft mating surfaces before installation to ensure no debris remains

• The suction and pressure ports are arranged at 180°—ensure correct piping connections

• Use ECKERLE-specified torque values for mounting bolts—avoid over-tightening which may cause housing distortion

• Suction height must not exceed 0.5 m

4. First Start-Up and Bleeding

• Before first start-up, must fill the pump with hydraulic oil through the inlet port—never start dry

• Before start-up, verify that the system relief valve (safety valve) is set to the correct pressure

• After start-up, run at low speed with no load for 2–3 minutes to ensure complete air evacuation from the system

• Check for abnormal noise or leakage—internal gear pumps are particularly sensitive to cavitation

5. Fluid and Filtration

• Use high-quality anti-wear hydraulic oil compliant with DIN 51524 standards

• Maintain system oil cleanliness to ISO 4406 18/15 or better

• Internal gear pumps have high cleanliness requirements—install a high-quality filter in the inlet line

• Working fluid must be selected strictly according to specifications

6. Periodic Maintenance

• Check mounting bolt torque every 1,000 operating hours

• Regularly monitor system operating pressure to ensure it does not exceed 320 bar (400 bar peak)

• ECKERLE internal gear pumps are known for long service life and low maintenance requirements—nevertheless, regularly inspect shaft seals to prevent leakage

• If flow output decreases, noise levels increase abnormally, or system temperature rises excessively, inspect and replace worn components promptly