HQ12-016RA04-11S Eckerle Gear Pump 16cc 250bar

Product Overview

The HQ12-016RA04-11S and HQI2/HQI3 series are internal gear pumps from the German manufacturer Eckerle. The HQ12-016RA04-11S features a displacement of 16 cm³/rev. The HQI2 series covers displacements from 5 to 25 cm³/rev， while the HQI3 series covers 20 to 50 cm³/rev.

The HQ/HQI series integrate Eckerle’s patented axial and radial gap compensation technology. The patented two-piece eccentric segment design enhances radial pressure compensation performance. The pumps deliver low noise (<66 dB) , low pulsation (~2%) , high volumetric efficiency (≥92%) , and long service life. Widely used in bending machines, presses, conveying technology, and other industrial hydraulic systems.

Every unit is manufactured to original equipment specifications, ensuring 100% drop-in interchangeability with genuine Eckerle HQ/HQI 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 

HQ12-016RA04-11S

• Model Code: HQ12-016RA04-11S

• Brand Series: Eckerle HQ12 Series Internal Gear Pump

• Product Type: Fixed Displacement Internal Gear Pump

• Displacement: 16 cm³/rev

• Continuous Operating Pressure: 250 bar

• Maximum Operating Pressure: 325 bar

• Maximum Speed: 4,000 r/min

• Minimum Speed: 600 r/min

• Rotation Direction: Clockwise (Right-hand)

• Seal Compensation: Axial + Radial compensation

• Rust Protection: GG25 phosphated treatment

• Hydraulic Fluid: Mineral oil per DIN 51524

• Operating Temperature: -10°C to +50°C

• Mounting Flange: SAE-A-2 flange

HQI2 Series

• Brand Series: Eckerle HQI2 Series Internal Gear Pump

• Product Type: Fixed Displacement Internal Gear Pump

• Displacement Range: 5 – 25 cm³/rev (5, 6, 8, 11, 13, 16, 19, 22, 25 cm³/rev)

• Continuous Operating Pressure: 330 bar (NG 5 – NG 16)

• Peak Pressure: 350 bar

• Maximum Speed: 4,200 r/min

• Minimum Speed: 600 r/min

• Rotation Direction: Clockwise / Counterclockwise available

• Rust Protection: GG25 phosphated treatment

• Hydraulic Fluid: Mineral oil per DIN 51524

• Operating Temperature Range: -40°C to +80°C

• Mounting Flange: SAE-A-2 flange

• Recommended Cleanliness: NAS 1638 Class 8

• Filtration Rating: β10 > 100

HQI3 Series

• Brand Series: Eckerle HQI3 Series Internal Gear Pump

• Product Type: Fixed Displacement Internal Gear Pump

• Displacement Range: 20 – 50 cm³/rev (20, 25, 32, 40, 50 cm³/rev)

• Continuous Operating Pressure: 330 bar (NG 20 – NG 32) / 250 bar (NG 40 – NG 50)

• Peak Pressure: 350 bar (NG 20 – NG 32)

• Maximum Speed: 3,600 r/min

• Minimum Speed: 600 r/min

• Rotation Direction: Clockwise / Counterclockwise available

• Rust Protection: GG25 phosphated treatment

• Hydraulic Fluid: Mineral oil per DIN 51524

• Operating Temperature Range: -20°C to +80°C

• Mounting Flange: SAE-A-2 flange

• Recommended Cleanliness: NAS 1638 Class 8

• Filtration Rating: β10 > 100

Key Technical Advantages

1. Axial & Radial Gap Compensation – High Efficiency

Patented axial and radial gap compensation technology. The two-piece eccentric segment design enhances radial pressure compensation performance. The compensation mechanism automatically adjusts gear end and radial clearances, achieving ≥92% volumetric efficiency.

2. Ultra-Low Noise & Minimal Pulsation (<66 dB / 2%)

The HQ/HQI series achieves ultra-low noise levels below 66 dB and pressure pulsation of approximately 2%. The gear meshing length ensures minimal flow and pressure pulsation. Ideal for noise-sensitive bending machines, presses, and other industrial environments.

3. High-Pressure Cast Iron Construction – Industrial-Grade Durability

The housing and SAE-A-2 flange are manufactured from GG25 cast iron with phosphate anti-rust treatment. HQI2 continuous pressure rating of 330 bar and peak of 350 bar. The high-strength cast iron housing ensures long-term reliability under high-pressure, high-frequency, continuous-duty operations.

4. Broad Speed & Temperature Range

HQI2 maximum speed 4,200 r/min, minimum 600 r/min. HQI3 maximum speed 3,600 r/min. Operating temperature range -40°C to +80°C (HQI2). Maintains stable flow characteristics from low-speed precision control to high-speed continuous duty.

5. Extended Service Life & Reliability

Eckerle internal gear pumps are renowned for their reliability, robust design, and long service life. Particularly suitable for demanding industrial applications.

6. 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

• Bending Machines: Hydraulic systems

• Presses: Hydraulic systems

• Conveying Technology: Hydraulic systems

• Special Purpose Machines: Hydraulic systems

• Injection Molding Machines: Servo hydraulic systems

• Construction Equipment: Hydraulic systems

Expert Maintenance Tips

1. Fluid Cleanliness Control

Maintain system fluid cleanliness to NAS 1638 Class 8 or better. Recommended filtration rating β10 > 100. 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. Suction and pressure ports are arranged at 180°. The return outflow must be below the oil surface. Inlet pressure must be maintained between 0.8 – 2.0 bar (absolute) .

3. Coupling Alignment Precision

Ensure pump shaft-to-drive shaft coaxiality deviation ≤0.05 mm and angular deviation ≤0.5° during installation. Use couplings to compensate for shaft misalignment. Flexible couplings are strongly recommended. Avoid radial or axial forces on the pump drive shaft.

4. First-Start Priming Procedure

Before initial startup, thoroughly bleed air through the drain port or a loosened outlet fitting. Never run the pump without oil. 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. Temperature & Viscosity Monitoring

Hydraulic fluid per DIN 51524. Operating viscosity range: 10 – 300 mm²/s. Operating temperature range: -40°C to +80°C. During cold starts when viscosity is high, ensure adequate suction conditions or preheat the fluid.

6. Rotation Direction Confirmation

This series is standard configured for clockwise (right-hand) rotation. Always verify that the drive motor/engine rotation matches the pump before installation.