Product Overview
The SGP series is a highly representative high-pressure external gear pump product line from SHIMADZU, comprising the SGP1 and SGP2 series. The SGP1 series covers displacements from 16 to 36 cm³/rev, while the SGP2 series ranges from 20 to 52 cm³/rev. Renowned for its high efficiency, low noise, and long service life, this series is widely used in forklifts, construction machinery, material handling equipment, and agricultural machinery. The specific model SGP2-32R030 belongs to the SGP2 series with a displacement of 32.5 cm³/rev and serves as a core power component in forklift hydraulic systems.
As a professional hydraulic component manufacturer, we provide 100% interchangeable replacement solutions for the SHIMADZU SGP series. Every SGP 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.
The SGP2 series features a special cast iron housing designed specifically for high-pressure applications. The pump adopts a 3-piece split structure (front cover, center body, and rear cover)—the front and rear covers are high-strength aluminum alloy die-castings, while the center body is cast iron. The bearing system utilizes DU bearings (composite plain bearings), and the side plates are made of bimetallic material. This design combination effectively enhances the performance and reliability of the gear pump.
Model Code SGP2-32R030 Breakdown:
SGP2: Product series code (SGP2 = high-pressure cast iron gear pump, 20–52 cm³/rev)
32: Nominal displacement 32.5 cm³/rev (SGP2-32 actual displacement is 32.5 cm³/rev)
R: Rotation direction — R = Clockwise (viewed from shaft end); L = Counter-clockwise
030: Derivative model code representing specific mounting flange type, shaft configuration, or seal specification
Note: The SGP2 series will be discontinued at the end of December 2025, with the MLP2 series as the next-generation replacement.
Technical Specifications
SGP2-32R030
Brand: SHIMADZU
Series: SGP2 high-pressure external gear pump
Theoretical Displacement: 32.5 cm³/rev
Rated Pressure: 24.5 MPa (245 bar / 3553 psi)
Peak Pressure: 29.4 MPa (294 bar / 4263 psi)
Minimum Speed: 400 min⁻¹
Maximum Speed: 3,000 min⁻¹
Inlet Pressure: -0.02 ~ 0.2 MPa
Housing Material: Special cast iron (high-pressure specification)
Structure Type: 3-piece split structure (aluminum front/rear covers + cast iron center body)
Bearing Type: DU bearings (composite plain bearings)
Side Plate Material: Bimetallic material
Seal Structure: Ceramic special seal (unique to SGP2 series)
Weight: 5.7 kg (front port) / 5.1 kg (rear port)
SGP2 Series Full Specifications
SGP2-20: 20.3 cm³/rev, rated 24.5 MPa, peak 29.4 MPa
SGP2-23: 23.3 cm³/rev, rated 24.5 MPa, peak 29.4 MPa
SGP2-25: 25.3 cm³/rev, rated 24.5 MPa, peak 29.4 MPa
SGP2-27: 27.4 cm³/rev, rated 24.5 MPa, peak 29.4 MPa
SGP2-32: 32.5 cm³/rev, rated 24.5 MPa, peak 29.4 MPa
SGP2-36: 36.5 cm³/rev, rated 24.5 MPa, peak 29.4 MPa
SGP2-40: 40.6 cm³/rev, rated 22.6 MPa, peak 27.5 MPa
SGP2-44: 44.7 cm³/rev, rated 20.6 MPa, peak 24.5 MPa
SGP2-48: 48.7 cm³/rev, rated 18.6 MPa, peak 22.6 MPa
SGP2-52: 52.8 cm³/rev, rated 17.2 MPa, peak 20.6 MPa
SGP1 Series Reference Specifications
Displacement Range: 16–36 cm³/rev
Rated Pressure: 20.6 MPa
Housing Material: Special cast iron
Maximum Speed: 3,000–4,000 min⁻¹ (depending on displacement)
Important Note: The above specifications are compiled from SHIMADZU official technical documentation and publicly available industry data. The SGP2 series will be discontinued in December 2025, with the MLP2 series as the replacement. 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 SGP2 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 forklifts, construction machinery, and other applications with frequent start-stop and load fluctuation.
2. Axial Clearance Auto-Compensation + Radial Hydraulic Balance — Ultra-High Volumetric Efficiency
The SGP2 series features axial clearance auto-compensation (bimetallic side plates + pressure balancing) 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. DU Bearings + Bimetallic Side Plates — Extended Service Life
The bearing system utilizes DU bearings (composite plain bearings) combined with bimetallic side plates. DU material offers excellent self-lubricating properties and wear resistance, operating stably under high-pressure, high-speed conditions without burning out. This combination significantly extends pump service life.
4. 3-Piece Compact Structure — Lightweight with High Strength
The SGP2 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. This design achieves significant weight reduction while maintaining structural rigidity and impact resistance, with total weight of only 5.1–5.7 kg, saving valuable installation space.
5. Special Cast Iron Housing + Ceramic Seal — Stable Operation Across Wide Temperature Range
The SGP2 series employs a special cast iron housing designed specifically for high-pressure applications. Combined with a ceramic special seal structure (unique to the SGP2 series), the pump maintains stable performance under wide temperature and wide speed range conditions, particularly excelling in high-temperature, low-speed harsh environments.
6. Excellent Contamination Resistance and Easy Maintenance
The SGP2 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 lifting, tilting, and other hydraulic functions
Construction Machinery: Hydraulic systems for excavators, loaders, rollers, and related equipment
Material Handling Equipment: Stackers, cranes, and transport vehicles
Road Machinery: Pavers, drilling rigs, bulldozers
Agricultural, Forestry & Fishery Machinery: Tractors, harvesters, fishery equipment
Industrial Hydraulic Power Units: Various industrial hydraulic stations and lubrication systems
Sanitation & Environmental Machinery: Garbage compactors, street sweepers, etc.
Expert Maintenance Tips
1. Verify Rotation Direction
SGP2 series pumps must only be operated in the specified rotation direction. In the model code, R = Clockwise (viewed from shaft end), L = Counter-clockwise. Always verify alignment with the drive motor’s rotation. Reverse operation is strictly prohibited—this will prevent proper suction and cause damage.
2. Never Run Dry
Avoid dry running under all circumstances. Sintering of tooth surfaces can occur within 30 seconds without lubrication. Purge air from the highest point of the pump body before first start-up and ensure the pump cavity is fully primed.
3. Fluid Cleanliness Requirements
Maintain fluid cleanliness to ISO 4406 19/16 or better. Install 100–125 mesh filters on the pump suction line and regularly inspect filter element condition. Compatible fluids include mineral hydraulic oils and lubricants (viscosity range 10–500 cSt).
4. Speed and Pressure Limits
Rated Pressure: 24.5 MPa (SGP2-32 and smaller displacement models)
Peak Pressure: 29.4 MPa — peak pressure is permitted for short-term transient conditions only; never exceed rated pressure during continuous operation
Minimum Speed: 400 min⁻¹, Maximum Speed: 3,000 min⁻¹
Recommended operating pressure: 70–80% of rated value
5. Temperature Monitoring
Housing Temperature: ≤ 70°C
Bearing Temperature: ≤ 80°C
Temperature Rise Rate: ≤ 35°C / 2 hours
If temperatures exceed limits, inspect fluid viscosity and cooling system
6. Coupling Installation and Shaft Alignment
The pump connects to the motor via coupling. Ensure proper coaxial alignment between the pump shaft and motor shaft, with misalignment not exceeding 0.1 mm and angular deviation ≤ 0.1° . Excessive misalignment will cause abnormal bearing loads and shorten pump service life.
7. Start-up and Shutdown Sequence
Start-up Procedure: Fully open inlet valve → close outlet valve → jog test run → slowly open outlet valve to rated pressure after normal operation
Shutdown Procedure: Close outlet valve first → stop motor → close inlet valve to prevent reverse flow impact
8. Regular Inspection and Maintenance
Daily Inspection: Pressure, temperature, noise, leakage
Every 500 Hours: Inspect system filter element condition
If abnormal noise, excessive housing temperature rise, or system pressure drop is detected, shut down immediately for inspection
