Product Overview
The SDY series is a highly representative high-pressure external gear pump product line from SHIMADZU, comprising the SDY1 and SDY sub-series. The SDY1 series features a SGP1 + YP15 duplex pump combination, with the SGP1 pump covering displacements from 16 to 36 cm³/rev and the YP15 pump covering 5 to 16 cm³/rev. This series includes models SDY1-36, SDYB36, SDY1-32, SDYB32, SDY1-30, SDYB30, SDY1-28, SDYB28, SDY1-25, and SDYB25. The model SDY1-27.5F2H2-L896 is a representative duplex pump in this series, featuring a 27.5 cm³/rev SGP1 pump. These pumps are widely used in forklifts, construction machinery, and various hydraulic systems.
As a professional hydraulic component manufacturer, we provide 100% interchangeable replacement solutions for the SHIMADZU SDY series. Every SDY series gear pump undergoes 100% performance testing under simulated actual operating conditions—from displacement accuracy and pressure stability to volumetric efficiency—fully benchmarked against SHIMADZU original equipment standards.
Model Code Explanation (using SDY1-27.5F2H2-L896 as an example):
SDY1: Duplex pump series code (SGP1 + YP15 combination)
27.5: SGP1 pump displacement 27.5 cm³/rev
F2H2: Mounting flange type and shaft configuration code
L896: Special configuration/custom code
SDYB Series Note: SDYB is a variant or derivative model code of the SDY series, commonly seen in models such as SDYB36, SDYB32, SDYB30, SDYB28, and SDYB25. The SDYB series shares the same technology platform and performance standards as the SDY1 series, with differences primarily in mounting configurations and shaft specifications.
Technical Specifications
SDY1 Series (SGP1 + YP15 Duplex Pump) General Specifications
Brand: SHIMADZU
Series: SDY1 Duplex Gear Pump (SGP1 + YP15)
SGP1 Pump Displacement Range: 16–36 cm³/rev
YP15 Pump Displacement Range: 5–16 cm³/rev
SGP1 Pump Rated Pressure: 20.6 MPa
YP15 Pump Rated Pressure: 20.6 MPa
SGP1 Pump Housing Material: Cast iron
YP15 Pump Housing Material: Aluminum alloy
Structure Type: 3-piece split structure (aluminum covers + cast iron center body)
Seal Technology: Axial flexible compensation + radial hydraulic balance
SDY1-27.5F2H2-L896 (Representative Model)
SGP1 Pump Displacement: 27.5 cm³/rev
YP15 Pump Displacement: 5–16 cm³/rev (configuration dependent)
SGP1 Pump Rated Pressure: 20.6 MPa
YP15 Pump Rated Pressure: 20.6 MPa
Minimum Speed: Approx. 500–600 min⁻¹
Maximum Speed: Approx. 2,500–3,000 min⁻¹
Mounting Type: Flange mounting (F2H2)
Fluid Compatibility: Petroleum-based hydraulic fluid
Housing Material: Cast iron (SGP1) / Aluminum alloy (YP15)
SDY1-36 / SDYB36
SGP1 Pump Displacement: 36 cm³/rev
YP15 Pump Displacement: 5–16 cm³/rev (configuration dependent)
SGP1 Pump Rated Pressure: 20.6 MPa
YP15 Pump Rated Pressure: 20.6 MPa
SDY1-32 / SDYB32
SGP1 Pump Displacement: 32 cm³/rev
YP15 Pump Displacement: 5–16 cm³/rev (configuration dependent)
SGP1 Pump Rated Pressure: 20.6 MPa
YP15 Pump Rated Pressure: 20.6 MPa
SDY1-30 / SDYB30
SGP1 Pump Displacement: 30 cm³/rev
YP15 Pump Displacement: 5–16 cm³/rev (configuration dependent)
SGP1 Pump Rated Pressure: 20.6 MPa
YP15 Pump Rated Pressure: 20.6 MPa
SDY1-28 / SDYB28
SGP1 Pump Displacement: 28 cm³/rev
YP15 Pump Displacement: 5–16 cm³/rev (configuration dependent)
SGP1 Pump Rated Pressure: 20.6 MPa
YP15 Pump Rated Pressure: 20.6 MPa
SDY1-25 / SDYB25
SGP1 Pump Displacement: 25 cm³/rev
YP15 Pump Displacement: 5–16 cm³/rev (configuration dependent)
SGP1 Pump Rated Pressure: 20.6 MPa
YP15 Pump Rated Pressure: 20.6 MPa
Important Note: The above specifications are compiled from SHIMADZU official technical documentation and publicly available industry data. The SDY1 series is a duplex pump combination; specific specifications (particularly the YP15 displacement) vary by configuration. The SDYB series is a derivative of the SDY series, sharing the same technology platform and performance standards. Different suffix codes represent different mounting flanges, shaft configurations, and seal specifications. Please refer to the product nameplate or technical agreement for exact specifications.
Key Technical Advantages
1. 1,000,000 Cycle Impact Fatigue Test — Ultimate Reliability
The SDY series has successfully passed 1,000,000 cycle impact fatigue tests at 20.6 MPa rated pressure. This rigorous testing standard ensures long-term reliability under high-pressure, high-frequency impact conditions—particularly suitable for forklifts, construction machinery, and other applications with frequent start-stop and load fluctuation.
2. Axial Flexible Compensation + Radial Hydraulic Balance — Ultra-High Volumetric Efficiency
The SDY series features axial flexible compensation and radial hydraulic balance technology. This design minimizes internal leakage under high pressure, achieving volumetric efficiency of 92% or higher with stable flow and minimal pressure fluctuation, significantly reducing system energy consumption.
3. Duplex Pump Integrated Design — Space Saving
The SDY1 series features a SGP1 + YP15 duplex pump combination driven by a single motor. This design effectively saves installation space and reduces system integration complexity, particularly suitable for mobile equipment such as forklifts with limited installation space.
4. 3-Piece Compact Structure — Lightweight with High Strength
The SDY series features a 3-piece split structure—the front and rear covers are high-strength aluminum alloy die-castings, while the center body is cast iron. The SGP1 pump uses a cast iron housing while the YP15 pump uses an aluminum alloy housing, achieving optimal weight control while maintaining structural rigidity and impact resistance.
5. Excellent Contamination Resistance and Easy Maintenance
The SDY series gear pump demonstrates high tolerance to fluid contamination. The 3-piece split structure enables extremely convenient disassembly and maintenance, with fewer components reducing maintenance costs and downtime.
Application Areas
Forklift Hydraulic Systems: Core power pump for 4–7T forklift lifting, tilting, and other hydraulic functions
Construction Machinery: Hydraulic systems for excavators, loaders, and related equipment
Lifting & Transport Machinery: Stackers, cranes, etc.
Road Machinery: Rollers, pavers, etc.
Sanitation & Environmental Machinery: Garbage compactors, street sweepers, etc.
Light Industry Machinery: Various industrial equipment
Expert Maintenance Tips
1. Verify Rotation Direction
SDY series pumps must only be operated in the specified rotation direction. Always verify that the rotation direction marked on the nameplate matches the drive motor’s rotation before installation. Reverse operation is strictly prohibited.
2. Never Run Dry
Avoid dry running under all circumstances. Ensure the pump cavity is fully filled with hydraulic fluid before startup; otherwise, severe wear or seizure of gears and bearings may occur.
3. Fluid Cleanliness Requirements
Maintain fluid cleanliness to ISO 4406 19/16 or better. Install appropriately rated filters on the pump suction line and regularly inspect filter element condition.
4. Speed and Pressure Limits
SDY1 Series SGP1 Pump Rated Pressure: 20.6 MPa
SDY1 Series YP15 Pump Rated Pressure: 20.6 MPa
Peak pressure is permitted for short-term transient conditions only — never exceed rated pressure during continuous operation
5. Duplex Pump Installation Precautions
The SDY1 series is a duplex pump (SGP1 + YP15). During installation, ensure correct oil circuit connections for both pumps to avoid oil cross-flow or pressure interference.
6. Regular Inspection and Maintenance
Inspect the system filter element condition every 500 operating hours. Regularly monitor the pump for abnormal operating noise—if abnormal noise or system pressure drop is detected, shut down immediately for inspection.
