Product Overview
The SGP1A20 L150, SGP1-32AS1HH-L201C, and SGP1A30R634 are members of the SHIMADZU SGP/SGP1/SGP1A Series high-pressure external gear pump family. Since its founding in 1875, SHIMADZU has been committed to the philosophy of “contributing to society through science and technology,” and its hydraulic products enjoy high recognition worldwide. Tianjin SHIMADZU Hydraulic Co., Ltd. (TSH), as SHIMADZU‘s production base in China, produces over 300,000 gear pumps annually, widely used in forklifts, construction machinery, agricultural equipment, and other applications.
The SGP1 Series features three-piece construction with axial clearance automatic compensation technology and radial hydraulic balance design, delivering high efficiency, low noise, compact structure, and strong contamination resistance. The series offers theoretical displacements from 16.2 mL/r to 36.6 mL/r, with a rated operating pressure of 20.6 MPa and a maximum pressure of 24.5 MPa (having passed one million shock fatigue tests at 24.5 MPa). SGP1 Series gear pumps can be configured as tandem or quadruple pumps, with various SAE and national standard flanges, shafts, and port connections available.
As original specification models within the SHIMADZU SGP/SGP1/SGP1A line, these products enable direct form-fit-function interchangeability with original SHIMADZU units—no modifications to piping or mounting interfaces required. Our replacement solutions strictly adhere to SHIMADZU technical standards and undergo 100% simulated in-service testing to ensure performance, reliability, and service life identical to OEM products.
Technical Specifications
Model 1: SGP1A20 L150
Applicable Model:
Model Code Breakdown (per SHIMADZU naming convention):
SGP — Product Series: SHIMADZU Gear Pump Series
1A — Group size: SGP1A Series (three-piece construction, aluminum/cast iron composite housing)
20 — Theoretical displacement: 20.4 mL/rev
L150 — Specific configuration code (rotation, flange, shaft, and port configuration)
This Model Detailed Specifications (per SHIMADZU official documentation):
Theoretical Displacement: 20.4 mL/rev
Rated Operating Pressure: 20.6 MPa (206 bar / 2,987 psi)
Maximum Operating Pressure: 24.5 MPa (245 bar / 3,553 psi)
Minimum Speed: 500 r/min
Maximum Speed: 4,000 r/min
Port Size (Inlet): Ø25 / PT1″
Port Size (Outlet): Ø19 / PT3/4″
Weight: 3.5 kg
Housing Material: Aluminum die-cast front/rear covers, cast iron center section
Bearing Type: DU Bushings
Side Plate Material: Bimetallic material
Model 2: SGP1-32AS1HH-L201C
Applicable Model:
Model Code Breakdown (per SHIMADZU naming convention):
SGP — Product Series: SHIMADZU Gear Pump Series
1 — Group size: SGP1 Series
32 — Theoretical displacement: 33.2 mL/rev
AS1HH-L201C — Specific configuration code (rotation, flange, shaft, and port configuration)
This Model Detailed Specifications (per SHIMADZU official documentation):
Theoretical Displacement: 33.2 mL/rev
Rated Operating Pressure: 20.6 MPa (206 bar / 2,987 psi)
Maximum Operating Pressure: 24.5 MPa (245 bar / 3,553 psi)
Minimum Speed: 400 r/min
Maximum Speed: 3,000 r/min
Port Size (Inlet): Ø25 / PT1″
Port Size (Outlet): Ø19 / PT3/4″
Weight: 4.2 kg
Series Displacement Range: 21.0 – 65.6 mL/rev
Operating Pressure: Up to 25 MPa
Maximum Operating Speed: Up to 3,300 r/min
Housing Material: Aluminum die-cast front/rear covers, cast iron center section
Design Features: External gear pump with axial flexible compensation and radial hydraulic balance
Model 3: SGP1A30R634
Applicable Model:
Model Code Breakdown (per SHIMADZU naming convention):
SGP — Product Series: SHIMADZU Gear Pump Series
1A — Group size: SGP1A Series
30 — Theoretical displacement: 29.9 mL/rev
R634 — Specific configuration code (R = Right-hand/Clockwise rotation)
This Model Detailed Specifications (per SHIMADZU official documentation):
Theoretical Displacement: 29.9 mL/rev
Rated Operating Pressure: 20.6 MPa (206 bar / 2,987 psi)
Maximum Operating Pressure: 24.5 MPa (245 bar / 3,553 psi)
Minimum Speed: 400 r/min
Maximum Speed: 3,000 r/min
Port Size (Inlet): Ø25 / PT1″
Port Size (Outlet): Ø19 / PT3/4″
Weight: 4.1 kg
Rotation Direction: Right-hand (clockwise, R suffix)
Housing Material: Aluminum die-cast front/rear covers, cast iron center section
Key Technical Advantages
1. Three-Piece Construction with Axial Automatic Compensation — High Volumetric Efficiency
The SGP1 Series features three-piece construction with axial clearance automatic compensation technology, where bushings automatically press against gear end faces under pressure to compensate for wear-induced clearance. Combined with radial hydraulic balance design, internal leakage is effectively minimized, ensuring high volumetric and mechanical efficiency under all operating conditions.
2. Superior Durability — Verified by One Million Shock Fatigue Tests
SGP Series gear pumps have passed one million shock fatigue tests at 24.5 MPa. High-performance wear-resistant bearings operate reliably without failure under high-pressure, high-speed conditions. The aluminum/cast iron composite housing with high-precision molding design ensures long-term reliable operation.
3. Low-Noise Design — Smooth Operation
The SGP1 Series features high-precision gear pairs with optimized gear engagement, combined with high-precision aluminum alloy housings, effectively reducing operating noise. Known for low noise, compact structure, stable performance, and strong contamination resistance.
4. Wide Speed Range with Broad Operating Adaptability
The SGP1 Series covers a speed range of 400 to 4,000 r/min, with wide adaptability to oil temperature and speed variations. SGP1A16–SGP1A23 offer maximum speeds of 4,000 r/min; SGP1A25–SGP1A36 offer maximum speeds of 3,000 r/min.
5. Flexible Configuration Options with Multi-Pump Combinations
SGP1 Series gear pumps can be configured as tandem or quadruple pumps. Various SAE and national standard flanges, shafts, and port connections are available. Widely used in tractor, construction machinery, and other mechanical hydraulic systems.
Application Areas
Forklifts: Preferred hydraulic power component for 1–3.5T electric forklifts
Construction Equipment: Excavator and wheel loader hydraulic working systems
Agricultural Machinery: Tractor and combine harvester hydraulic systems
Material Handling Equipment: Hydraulic systems for material handling machinery
Industrial Hydraulic Systems: Hydraulic power units for various industrial equipment
Specialty Vehicles: Municipal vehicle and street sweeper hydraulic systems
Expert Maintenance Tips
1. Installation Precautions
The SGP1 Series are uni-directional rotation pumps—verify that the system‘s required rotation direction matches the pump’s identification marking before installation. SGP1A30R634 with R suffix indicates right-hand (clockwise) rotation.
Ensure coaxial alignment between the pump and drive shaft; flexible couplings are recommended.
The suction line diameter must not be smaller than the pump inlet port (inlet Ø25 / PT1″) to prevent cavitation.
Mounting brackets must have adequate rigidity and alignment accuracy.
2. Fluid Management
Use anti-wear hydraulic oils conforming to ISO/DIN standards.
System fluid cleanliness must meet SHIMADZU-recommended standards.
Operating temperature should be maintained within the recommended range.
Prime the pump by filling the housing with hydraulic fluid through the suction port before initial start-up. Never run the pump dry.
3. Start-Up & Commissioning
Use jog start method for initial start-up; verify correct rotation direction before continuous operation.
Allow the pump to run under no-load (low pressure) conditions for 2-3 minutes to purge air and ensure proper lubrication.
Gradually increase to operating pressure (up to 24.5 MPa) while monitoring noise, temperature, and system pressure for normal operation.
4. Routine Maintenance
SGP1 gear pumps themselves are maintenance-free; however, regular maintenance of the entire hydraulic system is essential for trouble-free pump operation.
Inspect system fluid cleanliness and condition every 1,000-2,000 operating hours.
Regularly replace return line filters and suction strainers to prevent contaminant ingress into the pump body.
