HQ13-040RK33-10S123 Eckerle Gear Pump 40cc 280bar

Product Overview

The HQ13-040RK33-10S123, HQ13-032RA03-10S122, HQ12-013RK33-10S123, and HQ13-064RK23-10S122 are internal gear pumps from the German manufacturer Eckerle. Founded in 1935, Eckerle is the inventor of the internal gear pump and a global technology leader.

The HQ series is Eckerle’s gap-compensated high-pressure internal gear pump line, featuring 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, and long service life. Widely used in injection molding machines, die casting machines, bending machines, forklifts/stackers, and construction vehicles.

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

HQ Series General Specifications

• Brand Series: Eckerle HQ Series Internal Gear Pump

• Product Type: Fixed Displacement Internal Gear Pump

• Core Technology: Axial and radial gap compensation

• Patented Design: Two-piece eccentric segment design

• Pressure Compensation: Radial and axial pressure compensation

• Noise Level: < 66 dB

• Pressure Pulsation: Approx. 2%

• Suction/Pressure Port Angle: 180°

• Hydraulic Fluid: Mineral oil per DIN 51524

• Operating Temperature: -25°C to +70°C

• Ambient Temperature: -20°C to +80°C

• Housing Material: GG25 cast iron, phosphate anti-rust treatment

• Mounting Flange: SAE B 2-bolt flange

• Shaft Type: 25 mm

• Seals: NBR

• Rotation Direction: Right-hand (Clockwise)

Model-Specific Specifications

HQ13-040RK33-10S123

• Displacement: 40 cm³/rev

• Continuous Pressure: 250 bar

• Maximum Pressure: 280 bar

• Peak Pressure: 325 bar

• Maximum Speed: 2,500 rpm

• Speed Range: 600 – 3,600 rpm (varies by displacement)

• Mounting Flange: SAE B 2-bolt flange

• Shaft Type: 25 mm

• Seals: NBR

HQ13-032RA03-10S122

• Displacement: 32 cm³/rev

• Continuous Pressure: 250 bar

• Maximum Pressure: 280 bar (inferred)

• Peak Pressure: 325 bar

• Maximum Speed: 2,500 – 3,000 rpm (inferred)

• Speed Range: 600 – 3,600 rpm (varies by displacement)

• Mounting Flange: SAE B 2-bolt flange

• Seals: NBR

HQ12-013RK33-10S123

• Displacement: 13 cm³/rev

• Continuous Pressure: 250 bar

• Maximum Pressure: 280 bar (inferred)

• Peak Pressure: 325 bar

• Maximum Speed: 3,000 – 3,600 rpm (inferred)

• Speed Range: 600 – 3,600 rpm

• Mounting Flange: SAE B 2-bolt flange

• Seals: NBR

HQ13-064RK23-10S122

• Displacement: 64 cm³/rev

• Continuous Pressure: 250 bar

• Maximum Pressure: 280 bar (inferred)

• Peak Pressure: 325 bar

• Maximum Speed: 2,500 rpm (inferred)

• Speed Range: 600 – 3,600 rpm (varies by displacement)

• Mounting Flange: SAE B 2-bolt flange

• Seals: NBR

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, maintaining high volumetric efficiency across the full pressure range.

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

The HQ series achieves ultra-low noise levels below 66 dB and pressure pulsation of approximately 2%. Stable pressure ensures smooth mechanical operation. Ideal for noise-sensitive injection molding workshops and bending machines.

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

GG25 cast iron housing (phosphate anti-rust treated). Rated continuous pressure 250 bar, maximum pressure 280 bar, peak pressure 325 bar. The high-strength cast iron housing ensures long-term reliability under high-pressure, high-frequency, continuous-duty operations.

4. Extended Service Life & Excellent Contamination Resistance

Eckerle internal gear pumps are renowned for their long service life. Extremely low flow and pressure pulsation significantly reduce system vibration, extending pump and system component service life. Insensitive to oil contamination, suitable for long-term continuous operation in industrial hydraulic systems.

5. Broad Speed Range

Speed range from 600 to 3,600 rpm. Maintains stable flow characteristics from low-speed precision control to high-speed continuous duty. Suitable for variable-frequency/servo drive energy-saving hydraulic systems.

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

• Injection Molding Machines: Servo hydraulic systems, energy-efficient oil pump systems

• Die Casting Machines: High-pressure hydraulic systems

• Bending Machines: Hydraulic systems

• Forging Machinery: Hydraulic systems

• Forklifts/Stackers: Hydraulic systems

• Construction Vehicles: Hydraulic systems

• Elevators: Hydraulic systems

• Servo Energy-Saving Systems: Variable-speed drive 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) . Suction and pressure ports are arranged at 180°—pay attention to piping routing during installation.

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. If the drive involves sprockets or V-belt pulleys, an independent outboard bearing MUST be installed to protect the pump shaft.

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. Temperature & Viscosity Monitoring

Hydraulic fluid per DIN 51524. Operating temperature range: -25°C to +70°C. During cold starts when viscosity is high, ensure adequate suction conditions or preheat the fluid.

6. Rotation Direction Confirmation

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