Product Overview
The SDY / SDY-1A / SDY1A / SDYB series is a highly representative double high-pressure gear pump product line from SHIMADZU, widely used in excavators, forklifts, and other construction machinery hydraulic systems. This series features a SGP1/SGP2 + YP15 duplex pump combination—the SDY1 / SDY1A / SDYB series utilizes SGP1 + YP15, while the SDY series utilizes SGP2 + YP15. The SGP1 pump covers displacements from 16 to 36 cm³/rev (cast iron housing), and the YP15 pump covers 5 to 16 cm³/rev (aluminum alloy housing); the SGP2 pump covers 20 to 52 cm³/rev (cast iron housing), and the YP15 pump covers 5 to 16 cm³/rev (aluminum alloy housing).
Representative models include SDYB18-12R847 (SGP1 18 + YP15 12 cm³/rev), SDYB209.5F1H1-L451D (SGP2 20 + YP15 9.5 cm³/rev), and the SDY1A36 series (SGP1 36 cm³/rev combinations).
As a professional hydraulic component manufacturer, we provide 100% interchangeable replacement solutions for the SHIMADZU SDY series. Every SDY series double 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 SDYB18-12R847 as an example):
SDYB: Double pump series code (SGP1 + YP15 combination, B denotes specific configuration)
18: SGP1 pump displacement 18 cm³/rev
12: YP15 pump displacement 12 cm³/rev
R847: Special configuration/custom code (R indicates right-hand/clockwise rotation)
SDYB209.5F1H1-L451D Breakdown:
SDYB: Double pump series code
20: SGP2 pump displacement 20 cm³/rev
9.5: YP15 pump displacement 9.5 cm³/rev
F1H1-L451D: Mounting flange type, shaft configuration, and special options code
Technical Specifications
SDYB18-12R847 (Representative Model)
Brand: SHIMADZU
Series: SDYB Double Gear Pump (SGP1 + YP15)
SGP1 Pump Displacement: 18 cm³/rev
YP15 Pump Displacement: 12 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
Minimum Speed: Approx. 500–600 min⁻¹
Maximum Speed: Approx. 2,500–3,000 min⁻¹
Mounting Type: Flange mounting
Fluid Compatibility: Petroleum-based hydraulic fluid
Compatible Equipment: Excavators, forklifts, construction machinery
Weight: Approx. 28 kg
Durability: 1,000,000 cycle impact fatigue tested (at 24.5 MPa)
SDYB209.5F1H1-L451D (Representative Model)
Brand: SHIMADZU
Series: SDYB Double Gear Pump (SGP2 + YP15)
SGP2 Pump Displacement: 20 cm³/rev
YP15 Pump Displacement: 9.5 cm³/rev
SGP2 Pump Rated Pressure: 24.5 MPa
YP15 Pump Rated Pressure: 20.6 MPa
SGP2 Pump Housing Material: Cast iron
YP15 Pump Housing Material: Aluminum alloy
Minimum Speed: Approx. 500–600 min⁻¹
Maximum Speed: Approx. 2,500–3,000 min⁻¹
Mounting Type: Flange mounting (F1H1)
Fluid Compatibility: Petroleum-based hydraulic fluid
Compatible Equipment: Excavators, forklifts, construction machinery
Durability: 1,000,000 cycle impact fatigue tested (at 24.5 MPa)
SDY / SDY1A / SDYB / SDY-1A Series General Specifications
Structure: SGP1/SGP2 (cast iron) + YP15 (aluminum alloy) duplex combination
SGP1 Pump Displacement Range: 16–36 cm³/rev
SGP2 Pump Displacement Range: 20–52 cm³/rev
YP15 Pump Displacement Range: 5–16 cm³/rev
SGP1 Pump Rated Pressure: Max 20.6 MPa
SGP2 Pump Rated Pressure: Max 24.5 MPa
YP15 Pump Rated Pressure: Max 20.6 MPa
High Efficiency: Precision-engineered construction maintains high volumetric and mechanical efficiency
Low Noise: Precision aluminum alloy design for low noise operation
Lightweight: Compact and refined structure
Wide Application: Construction machinery, industrial vehicles, material handling, agricultural machinery
Important Note: The above specifications are compiled from SHIMADZU official technical documentation and publicly available industry data. Different suffix codes represent different YP15 pump displacements, mounting flanges, and shaft configurations. The SDY series uses SGP2+YP15 combination (rated 24.5 MPa), while SDY1/SDY1A/SDYB series use SGP1+YP15 combination (rated 20.6 MPa). 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 24.5 MPa rated pressure. This rigorous testing standard ensures long-term reliability under high-pressure, high-frequency impact conditions—particularly suitable for excavators, forklifts, and other construction machinery with frequent start-stop and load fluctuation.
2. Duplex Pump Integrated Design — Space Saving
The SDY series features a SGP1/SGP2 + 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 excavators and forklifts with limited installation space.
3. Cast Iron + Aluminum Composite Materials — Lightweight with High Strength
The SDY series features composite material design—the SGP1/SGP2 pump uses a cast iron housing for structural rigidity under high pressure, while the YP15 pump uses an aluminum alloy housing for lightweight construction. This combination achieves optimal weight control while maintaining structural integrity.
4. High Efficiency Design — Significant Energy Savings
With precision-engineered construction, the SDY series gear pumps maintain high volumetric and mechanical efficiency. Minimal power loss and low fluid temperature rise effectively reduce system energy consumption and improve overall machine efficiency.
5. Low Noise Operation — Wide Applicability
The SDY series features precision aluminum alloy design for low noise operation. Widely used in construction machinery, industrial vehicles, material handling equipment, and agricultural machinery. High-performance wear-resistant bearings ensure stable operation under high-pressure, high-speed conditions.
Application Areas
Excavator Hydraulic Systems: Core power pump for excavator hydraulic systems
Forklift Hydraulic Systems: Core power pump for 4–7T forklift lifting, tilting, and other hydraulic functions
Construction Machinery: Hydraulic systems for loaders, rollers, and related equipment
Lifting & Transport Machinery: Stackers, cranes, etc.
Road Machinery: Pavers, drilling rigs, etc.
Agricultural, Forestry & Fishery Machinery: Tractors, harvesters, fishery equipment
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. In the model code, R = Right-hand/Clockwise (viewed from shaft end). Always verify alignment with 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 / SDY1A / SDYB Series (SGP1 + YP15): SGP1 rated 20.6 MPa, YP15 rated 20.6 MPa
SDY Series (SGP2 + YP15): SGP2 rated 24.5 MPa, YP15 rated 20.6 MPa
Peak pressure is permitted for short-term transient conditions only — never exceed rated pressure during continuous operation
1,000,000 cycle impact fatigue tested at 24.5 MPa
5. Duplex Pump Installation Precautions
The SDY series is a duplex pump (SGP1/SGP2 + 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. High-performance wear-resistant bearings ensure long service life.
