Sumitomo QT62-125F Gear Pump | QT62-125F-BP-Z & QT6N-100E-SV-Z | Injection Molding Machine Pump

Chengyuan Hydraulic presents the QT62 and QT6N series internal gear pumps, engineered as premium replacements for the Sumitomo line. These pumps are the cornerstone of modern energy-saving hydraulic systems, particularly within the servo-driven injection molding industry. Our flagship models, including the QT62-125F-BP-Z and QT6N-100E-SV-Z, feature a sophisticated internal meshing design that provides nearly pulseless flow and ultra-low noise levels. Chengyuan guarantees 100% Drop-in Interchangeability, ensuring that every unit fits perfectly into existing Sumitomo mountings. Each pump undergoes rigorous 100% simulation load testing to ensure it meets or exceeds the volumetric efficiency and reliability of the original equipment.

Technical Specifications 

• Compatible Brand: Sumitomo (QT Type)

• Model Designations: QT62-125F-BP-Z / QT62-125F-SV-Z / QT6N-100E-SV-Z

• Displacement: 125 cc/rev (QT62 series) / 100 cc/rev (QT6N series)

• Rated Pressure: 25 MPa (250 bar)

• Peak Pressure: 31.5 MPa (315 bar)

• Max Speed: 1800 rpm (Compatible with servo-motor drive)

• Min Speed: 300 rpm (Maintains stability at low speed)

• Volumetric Efficiency: ≥ 96%

• Mounting Standard: SAE Standard Flange

• Fluid Medium: Anti-wear hydraulic oil (ISO VG32/46/68)

Key Technical Advantages:

• Linear Conjugate Internal Meshing: Utilizing a unique tooth profile, the contact between inner and outer gears is a smooth sliding motion rather than a rolling impact. This technology reduces noise to under 65 dB(A) and significantly lowers mechanical friction under high pressure.

• Axial & Radial Pressure Compensation: To combat internal leakage, the QT series incorporates floating side plates and radial compensation segments. These components automatically adjust clearances based on system pressure, maintaining a constant 96% volumetric efficiency throughout the service life.

• Minimal Flow Pulsation: The internal meshing structure ensures an exceptionally stable flow output. This is vital for injection molding machines to achieve precise injection speeds and consistent clamping forces, directly improving product quality.

• High-Strength Ductile Iron Housing: The pump body is precision-cast from heavy-duty ductile iron, providing superior fatigue resistance and structural integrity to withstand the frequent pressure spikes typical of molding cycles.

Application Areas:

• High-Precision Servo Injection Molding Machines: Powers injection, clamping, and ejection stages.

• Die-Casting Machinery: Reliable power source for aluminum and magnesium casting processes.

• Hydraulic Presses & Shears: Suitable for high-speed operation and long-duration pressure holding.

• Industrial HPU (Hydraulic Power Units): Ideal for servo-driven energy-saving systems in manufacturing plants.

Expert Maintenance Tips:

• Pre-Start Priming: Always fill the pump housing with clean hydraulic oil through the pressure port before initial startup. Dry running for even a few seconds can cause permanent damage to the precision gear surfaces.

• Aviation & Cavitation Check: Ensure all suction lines are perfectly airtight. Internal gear pumps are highly sensitive to aeration; any air ingress will lead to cavitation, resulting in excessive vibration and high-pitched noise.

• Filtration Standards: To protect the micron-level clearances of the internal gears, maintain a system filtration level of at least 10 microns and ensure oil cleanliness stays within NAS Class 8.