SDY1A-3612L573 SHIMADZU Double Gear Pump 36 cm³/rev 20.6 MPa

Product Overview

The SDY / SDY1A / SDY1 series is a highly representative double gear pump product line from SHIMADZU. This series features a SGP1 + YP15 duplex pump combination—the SGP1 pump covers displacements from 16 to 36 cm³/rev (cast iron housing), while the YP15 pump covers 5 to 16 cm³/rev (aluminum alloy housing). Representative models include SDY1A-3612L573 (SGP1 36 + YP15 12 cm³/rev) and SDY1-363.5R525 (SGP1 36 + YP15 3.5 cm³/rev), widely used in excavators, forklifts, and construction machinery hydraulic systems.

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 SDY1A-3612L573 as an example):

• SDY1A / SDY1: Double pump series code (SGP1 + YP15 combination)

• 36: SGP1 pump displacement 36 cm³/rev

• 12: YP15 pump displacement 12 cm³/rev

• L573: Special configuration/custom code

SDY1-363.5R525 Breakdown:

• SDY1: Double pump series code

• 36: SGP1 pump displacement 36 cm³/rev

• 3.5: YP15 pump displacement 3.5 cm³/rev

• R525: Special configuration/custom code (R indicates right-hand/clockwise rotation)

Technical Specifications 

SDY1A-3612L573 (Representative Model)

• Brand: SHIMADZU

• Series: SDY1A Double Gear Pump (SGP1 + YP15)

• SGP1 Pump Displacement: 36 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

• Durability: 1,000,000 cycle impact fatigue tested (at 24.5 MPa)

SDY1-363.5R525 (Representative Model)

• Brand: SHIMADZU

• Series: SDY1 Double Gear Pump (SGP1 + YP15)

• SGP1 Pump Displacement: 36 cm³/rev

• YP15 Pump Displacement: 3.5 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

• Rotation Direction: Right-hand / Clockwise (R)

• Compatible Model: TCM Z8/5-7T forklift

• Weight: 6.25 kg

• Housing Material: Cast iron / Alloy steel

• Durability: 1,000,000 cycle impact fatigue tested (at 24.5 MPa)

SDY / SDY1 / SDY1A Series General Specifications

• Structure: SGP1 (cast iron) + YP15 (aluminum alloy) duplex combination

• SGP1 Pump Displacement Range: 16–36 cm³/rev

• YP15 Pump Displacement Range: 5–16 cm³/rev

• Rated Pressure: Max 20.6 MPa

• High Efficiency: High volumetric and mechanical efficiency

• Low Noise: Precision aluminum alloy design for low noise

• 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. 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 + 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 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, with total weight of only 6.25 kg.

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.

Application Areas

• Excavator Hydraulic Systems: Core power pump for excavator hydraulic systems

• Forklift Hydraulic Systems: Core power pump for 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

• SDY Series SGP1 Pump Rated Pressure: 20.6 MPa

• SDY 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 SDY 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.