Sumitomo Gear Pump QT Series (QT52-50, QT52-63, QT62-80, QT63-125) Parameter & Model Description

1. Model Code Interpretation

• QT52: Series identifier, indicating a medium-pressure and medium-flow external gear fixed displacement pump of the QT52 series produced by Sumitomo, designed for general industrial hydraulic system requirements, with a compact structure, stable operation and strong adaptability, suitable for medium-duty industrial scenarios.
• QT62: Series identifier, indicating a medium-high pressure and medium-large flow external gear fixed displacement pump of the QT62 series produced by Sumitomo, with higher pressure resistance and larger flow output than QT52 series, robust structure and high efficiency, suitable for medium-heavy duty industrial scenarios.
• QT63: Series identifier, indicating a high-pressure and large-flow external gear fixed displacement pump of the QT63 series produced by Sumitomo, with the highest pressure resistance and largest flow output among the three series, strong overload capacity and long service life, suitable for heavy-duty industrial scenarios.
• 50/63/80/125: Nominal displacement of the gear pump, corresponding to four specifications respectively: 50 cc/rev (QT52-50), 63 cc/rev (QT52-63), 80 cc/rev (QT62-80) and 125 cc/rev (QT63-125), which can meet different flow demands of hydraulic systems.

2. Core Technical Parameters

3. Performance Characteristics

• QT52 series (QT52-50, QT52-50) adopts a compact external gear structure, with medium pressure resistance and medium flow output, strong pollution resistance and low requirements on hydraulic oil cleanliness, which can adapt to general medium-duty industrial working environments and reduce daily maintenance costs;
• QT62 series (QT62-80) features a more robust structure than QT52 series, with higher pressure resistance and larger flow output, high efficiency and stable operation, suitable for medium-heavy duty industrial scenarios that require higher flow and pressure;
• QT63 series (QT63-125) is the high-end model among the three series, with the highest pressure resistance (up to 28.0 MPa) and largest flow output, strong overload capacity and excellent wear resistance, suitable for harsh heavy-duty industrial working environments;
• All four models feature high efficiency (efficiency range 75% – 90%), stable output flow and strong overload capacity, suitable for long-term continuous operation; the installation and connection dimensions comply with ISO international standards, facilitating replacement with domestic and foreign similar gear pump products and strong interchangeability;
• The key components (gears, shaft, oil seal) are made of high-wear-resistant and high-temperature resistant materials, referring to advanced gear processing technology to ensure good sealing performance and long service life, effectively reducing the risk of hydraulic oil leakage and equipment failure.

4. Application Scope

5. Notes

• The pump should be used within the specified temperature and viscosity range, and the hydraulic oil should be regularly filtered to avoid performance degradation or component wear caused by excessive temperature, inappropriate oil viscosity or oil pollution; pay attention to the difference in maximum operating pressure among QT52, QT62 and QT63 series to avoid overload operation.
• When installing, use the specified number, strength class and tightening torque of bolts according to the model (QT52, QT62 and QT63 series have different bolt specifications) to prevent bolt damage, pump loosening and hydraulic oil leakage; check the coupling connection before startup to ensure correct installation.
• For detailed dimensions, oil port specifications, maintenance methods and spare parts information of the four models, refer to Sumitomo official technical manual (Document No. QT-Series-003); regular maintenance is recommended to extend the service life, and the lubrication system should be checked regularly to ensure sufficient lubrication.