QT42-40F-BP-Z SUMITOMO Hydraulic Gear Pump 40cc 250bar

Product Overview

The QT42-40F-BP-Z is a SUMITOMO QT Series internal gear pump. As a globally recognized brand in hydraulic transmission, SUMITOMO QT Series gear pumps are widely used in injection molding machines, die-casting machines, forging machinery, press brakes, industrial machinery, and marine applications.

The QT Series internal gear pumps feature a special tooth profile design that minimizes the enclosed volume, delivering exceptional quiet operation—noise levels remain nearly constant even as pressure or speed increases. The QT42-40F-BP-Z is a 40 cc/rev model within the QT42 series, with the BP-Z suffix indicating a servo pump configuration optimized for servo motor drives, offering energy saving, low noise, and low pulsation. It achieves working pressures up to 250 bar while maintaining a long service life.

As an original specification model within the SUMITOMO QT line, this product enables direct form-fit-function interchangeability with original SUMITOMO units—no modifications to piping or mounting interfaces required. Our replacement solution strictly adheres to SUMITOMO technical standards and undergoes 100% simulated in-service testing to ensure performance, reliability, and service life identical to OEM products.

Technical Specifications

Applicable Model (Primary):

• QT42-40F-BP-Z

Model Code Breakdown:

• QT42 — Series designation

• 40 — Displacement code: 40 cm³/rev

• F — Flange and mounting specification

• BP — Servo pump configuration

• Z — Specific configuration code

QT Series Technical Specifications (per SUMITOMO official documentation):

• Product Series: SUMITOMO QT Internal Gear Pump

• Pump Type: Internal Gear Pump

• Displacement Range: 5 to 250 cc/rev

• Rated Pressure (High-Pressure Series): Up to 31.4 MPa

• Maximum Pressure (High-Pressure Series): Up to 34.3 MPa

• Speed Range: 1,000 to 1,800 rpm

• Noise Level: Extremely low, remains constant with pressure/speed increase

• Pulsation Rate: Nearly zero (0.2 MPa), ideal for precision speed control systems

• Fluid Compatibility: Anti-wear hydraulic oil

• Recommended Viscosity: 40 cSt (ISO VG32, oil temperature 50℃)

• Recommended Oil Temperature: 0℃ to 60℃

• Inlet Pressure: -0.03 MPa to +0.03 MPa

This Model (QT42-40F-BP-Z) Detailed Specifications (compiled from multiple sources):

• Geometric Displacement: 40 cm³/rev

• Operating Pressure: Up to 250 bar (25 MPa)

• Rated Speed: 1,500 r/min

• Rotation Direction: Forward (Clockwise)

• Housing Material: High-quality Alloy Steel / Cast Iron

• Fluid Compatibility: Anti-wear hydraulic oil (ISO VG32)

• Recommended Oil Temperature: 0℃ to 60℃

Key Technical Advantages

1. Internal Gear Construction with Special Tooth Design — Ultra-Low Noise Operation
The QT Series features internal gear pump construction with a special tooth design that minimizes the enclosed volume. Noise levels remain nearly constant even as pressure or speed increases, with excellent sound quality that is barely perceptible during operation. This makes it the ideal choice for noise-sensitive applications such as injection molding and die-casting machines.

2. Forced Lubrication with Non-Contact Design — Superior Durability
The QT Series features a simple construction with forced lubrication on sliding surfaces, with no direct contact between functional components. As a result, component wear is minimal. Even when using low-lubricity fluids (such as water-glycol), wear is remarkably low. This design ensures high reliability and extended service life under long-term operation.

3. Extremely Low Pressure Pulsation — Superior System Stability
The QT Series achieves a pressure pulsation rate as low as 0.2 MPa. This ultra-low pulsation ensures smoother hydraulic system operation, reduces system vibration and noise, and extends the service life of other system components.

4. BP-Z Servo Pump Configuration — Optimized for Servo Systems
The BP-Z suffix on the QT42-40F-BP-Z indicates it is part of the QT-BP Series servo pump line. This configuration is optimized for servo motor drives, offering energy saving, low noise, and low pulsation. This makes the pump an ideal choice for injection molding machine servo hydraulic systems and servo energy-saving equipment retrofits.

Application Areas

• Injection Molding Machinery: Injection molding machine servo hydraulic systems, servo energy-saving equipment retrofits

• Die-Casting Machinery: Die-casting machine hydraulic systems

• Forging Machinery: Forging and stamping press hydraulic systems

• Press Brakes: Press brake hydraulic systems

• Industrial Machinery: Machine tools, machining centers, CNC lathes, etc.

• Marine Applications: Marine hydraulic systems

Expert Maintenance Tips

1. Installation Precautions

• The QT Series is a uni-directional rotation pump—verify that the system’s required rotation direction matches the pump’s identification marking before installation (QT42-40F-BP-Z features forward/clockwise rotation).

• Ensure coaxial alignment between the pump and drive shaft; flexible couplings are recommended to avoid radial loads on the pump shaft.

• Inlet pressure should be maintained at -0.03 MPa to +0.03 MPa.

• The suction line diameter must not be smaller than the pump inlet port to prevent cavitation.

2. Fluid Management

• Use anti-wear hydraulic oil with viscosity grade ISO VG32 (40 cSt @ 50℃).

• Recommended operating oil temperature is 0℃ to 60℃.

• System fluid cleanliness must meet SUMITOMO-recommended standards.

• Prime the pump by filling the housing with hydraulic fluid through the suction port before initial start-up. Never run the pump dry.

3. Start-Up & Commissioning

• Use jog start method for initial start-up; verify correct rotation direction before continuous operation.

• Allow the pump to run under no-load (low pressure) conditions for 2-3 minutes to purge air and ensure proper lubrication.

• Gradually increase to operating pressure while monitoring noise, temperature, and system pressure for normal operation.

4. Routine Maintenance

• The QT gear pump itself is maintenance-free; however, regular maintenance of the entire hydraulic system is essential for trouble-free pump operation.

• Inspect system fluid cleanliness and condition every 1,000-2,000 operating hours.

• Regularly repla