Product Overview
The 890-EI-0400/0640/0800/1000 are internal gear pumps from the German manufacturer Eckerle’s 890-EI series, belonging to its EIPH (High-Pressure Industrial) series. Founded in 1935, Eckerle is the inventor of the internal gear pump and a global technology leader. The pump features a high-strength cast iron body, delivering superior structural rigidity and pressure containment compared to aluminum-bodied pumps under high-pressure, high-frequency, continuous-duty operations.
The 890-EI series integrates Eckerle’s axial and radial pressure compensation technology with a patented two-piece eccentric segment design, delivering low noise (<66 dB), low pulsation (2%), and high volumetric efficiency (92%). Displacements range from 400 to 1000 cm³/rev, with a rated pressure of 320 bar (32 MPa) and peak pressures up to 420 bar.
Every unit is manufactured to original equipment specifications, ensuring 100% drop-in interchangeability with genuine Eckerle 890-EI series pumps without any system modifications. Each pump undergoes rigorous 100% simulated duty-cycle testing to validate pressure-flow-efficiency performance curves.
Brand Disclaimer: This product is a high-quality compatible replacement engineered for full interchangeability with Eckerle original equipment. All Eckerle brand names and model codes are referenced solely to indicate compatibility and interchangeability. This product is manufactured by an independent producer and is not an original Eckerle product.
Technical Specifications
890-EI Series General Specifications
Brand Series: Eckerle 890-EI Series (EIPH High-Pressure Industrial Series)
Product Type: Fixed Displacement Internal Gear Pump
Generation: 5th Generation
Housing Material: High-strength Cast Iron
Rated Continuous Pressure: 320 bar (32 MPa)
Peak Pressure (Intermittent) : 350 – 420 bar
Pressure Compensation: Axial + Radial pressure compensation
Patented Technology: Two-piece eccentric segment design
Noise Level: < 66 dB
Pressure Pulsation: Approx. 2%
Volumetric Efficiency: 92%
Hydraulic Fluid: Mineral oil (HLP/HVLP)
Operating Temperature: -20°C to +80°C
Mounting: SAE standard flange mounting, multi-pump combinations supported
Certification: EN ISO 12100 (Safety of machinery)
Model-Specific Specifications
890-EI-0400-RK2/RS2 (400 cm³/rev)
Displacement: 400 cm³/rev
Rated Pressure: 320 bar
Peak Pressure: 350 – 420 bar (configuration dependent)
Typical Flow (@1500 rpm): Approx. 600 L/min
Applications: Medium injection molding machines, die casting machines
890-EI-0640-RK2/RS2 (640 cm³/rev)
Displacement: 640 cm³/rev
Rated Pressure: 320 bar
Peak Pressure: 350 – 420 bar (configuration dependent)
Typical Flow (@1500 rpm): Approx. 960 L/min
Applications: Large injection molding machines, heavy-duty die casting machines
890-EI-0800-RK2/RS2 (800 cm³/rev)
Displacement: 800 cm³/rev
Rated Pressure: 320 bar
Peak Pressure: 350 – 420 bar (configuration dependent)
Typical Flow (@1500 rpm): Approx. 1200 L/min
Applications: Extra-large injection molding machines, heavy industrial hydraulic systems
890-EI-1000-RK2/RS2 (1000 cm³/rev)
Displacement: 1000 cm³/rev
Rated Pressure: 320 bar
Peak Pressure: 350 – 420 bar (configuration dependent)
Typical Flow (@1500 rpm): Approx. 1500 L/min
Applications: Ultra-high-flow servo hydraulic systems, heavy-duty equipment
Model Code Decoder
890-EI: Eckerle internal gear pump series code
0400/0640/0800/1000: Nominal displacement ×10 (e.g., 0400 = 400 cm³/rev)
RK2 / RS2: Shaft and flange configuration codes
C301 / C302 / C503 / C621: Port configuration and seal material codes
C301/C302: Standard configuration, NBR seals
C503: Special port configuration
C621: High-temperature configuration, FKM (Viton) seals
Key Technical Advantages
1. Axial & Radial Pressure Compensation – High Efficiency
Innovative axial and radial pressure compensation technology with a patented two-piece eccentric segment design automatically adjusts gear end and radial clearances, maintaining 92% volumetric efficiency even at low speeds and low viscosities.
2. Ultra-Low Noise & Minimal Pulsation (<66 dB / 2%)
The 890-EI series achieves ultra-low noise levels below 66 dB and pressure pulsation of approximately 2%. Ideal for noise-sensitive injection molding workshops and precision industrial equipment, significantly improving working environments and extending system life.
3. High-Pressure Cast Iron Construction – Industrial-Grade Durability
The high-strength cast iron housing delivers approximately 30% higher structural strength than aluminum-bodied pumps under extreme pressures. Rated at 320 bar continuous and 420 bar peak—particularly suited for injection molding machines, die casting machines, and other high-pressure, high-frequency, continuous-duty industrial hydraulic systems.
4. 5th Generation Internal Gear Technology – Extended Service Life
The 890-EI series represents Eckerle’s 5th generation internal gear pump technology, proven and refined over decades of market validation. Extremely low flow and pressure pulsation significantly reduce system vibration, ensuring extended service life.
5. Modular Design – Flexible Multi-Pump Expandability
The 890-EI series supports multi-pump combinations (可多联式连结) . Flexible combinations adapt to complex hydraulic systems requiring multiple independent flow circuits.
6. Optimized for Servo Systems
Specifically engineered for servo-driven applications, the 890-EI series delivers rapid response to speed changes and maintains stable pressure and flow output at low RPM—the ideal choice for injection molding machine servo-hydraulic energy-saving systems.
7. 100% Simulated Duty-Cycle Testing
Every pump is 100% tested on dedicated hydraulic test benches under simulated real-world operating conditions—validating pressure-flow characteristics and efficiency curves at rated pressure and full speed range—ensuring zero-defect, plug-and-play performance upon installation.
Application Areas
Injection Molding Machines: Servo hydraulic systems, energy-efficient oil pump systems
Die Casting Machines: High-pressure hydraulic systems
Bending Machines: Hydraulic systems
Punch Presses: Hydraulic systems
Molding Machinery: Servo energy-saving systems
Forklifts: Hydraulic systems
Construction Vehicles: Hydraulic systems
Expert Maintenance Tips
1. Fluid Cleanliness Control
Internal gear pumps have relatively low sensitivity to contamination, but maintain system fluid cleanliness to ISO 4406 19/17/14 or better as good practice. Install a ≤10 μm absolute filtration filter upstream of the inlet port.
2. Inlet Line Requirements
Keep suction lines short and straight with adequate diameter—not less than the port size. Inlet pressure must be maintained between 0.8 – 2.0 bar (absolute) to prevent cavitation.
3. Coupling Alignment Precision
Ensure pump shaft-to-drive shaft coaxiality deviation ≤0.05 mm and angular deviation ≤0.5° during installation. Flexible couplings are strongly recommended.
4. First-Start Priming Procedure
Before initial startup, thoroughly bleed air through the drain port or a loosened outlet fitting. Perform 2–3 jog starts under no-load conditions (outlet open) until oil fills the pump cavity without air bubbles, then connect the load circuit for full operation.
5. Servo System Speed Matching
The 890-EI series is optimized for servo systems and operates stably across a wide speed range. Ensure that servo drive acceleration/deceleration parameters match the pump’s dynamic response characteristics to prevent cavitation or pressure shock from sudden speed changes.
6. Rotation Direction Confirmation
“R” indicates right-hand (clockwise) rotation; “L” indicates left-hand (counterclockwise) . Always verify that the drive motor/engine rotation matches the pump before installation.
