Product Overview
The SGP1A30R634, SGP1A-27L387, SGP1A32A1HH1-L057C, and SGP2 / SGP2A series hydraulic gear pumps originate from Japan’s SHIMADZU SGP Series external gear pump platform. Founded in 1875, SHIMADZU is a globally renowned manufacturer of precision instruments and hydraulic components. Its SGP Series gear pumps are recognized for high pressure, compact aluminum construction, and excellent durability.
The SGP Series features external gear pump construction with a three-piece split housing design. The bushings are equipped with DU bearings, and the side plates are made of bimetal material; the front and rear covers are aluminum die-cast, while the center housing is cast iron. The pump features axial clearance automatic compensation and radial hydraulic balance, having passed one million impact fatigue tests at 24.5 MPa.
The SGP Series is available in SGP1A (displacement 16–36 cm³/rev) and SGP2A (displacement 20–52+ cm³/rev) sub-series. The SGP2 Series also features axial clearance automatic compensation and radial hydraulic balance with a three-piece split housing and DU bearings.
Key Interchangeability Advantage: Our SGP series gear pumps are manufactured to strict Japanese SHIMADZU original design specifications, ensuring 100% direct interchangeability with original units. All mounting interfaces (flange/foot mount), shaft configurations, and port positions are identical to the original product – no modifications required. Every pump undergoes 100% factory performance testing under simulated operating conditions (covering rated pressure, peak pressure, and full speed range performance curves), guaranteeing plug-and-play reliability with zero performance deviation.
Model Code Breakdown (based on SHIMADZU SGP Series designation rules):
SGP1 / SGP2 = Series code (1 Series / 2 Series)
A = Flange pilot diameter code
16 / 18 / 20 / 23 / 25 / 27 / 30 / 32 / 34 / 36 = Nominal displacement (cm³/rev)
D / F = Port position (D: rear port / F: side port)
H / H1 / H2 = Shaft type
L / R = Rotation direction (L: left-hand / R: right-hand)
634 / 387 / L057C = Design number / specific configuration code
Technical Specifications
SGP1 Series – General Specifications
Product Series: SHIMADZU SGP1 Series External Gear Pump
Brand: SHIMADZU (Japan)
Pump Type: External gear pump, three-piece split housing, axial clearance compensation, radial hydraulic balance
Displacement Range: 16.2 – 36.6 cm³/rev
Maximum Pressure: 24.5 MPa (245 bar)
Rated Pressure: 17.2 – 20.6 MPa (172 – 206 bar)
Minimum Speed: 400 – 500 rpm (displacement-dependent)
Maximum Speed: 3000 – 4000 rpm (displacement-dependent)
Port Size (Inlet): Ø25, PT1″
Port Size (Outlet): Ø19, PT3/4″
Housing Material: Front/rear covers aluminum die-cast, center housing cast iron; body aluminum
Bearings: DU bushings
Side Plates: Bimetal material
Seals: NBR
Recommended Fluid: Mineral hydraulic oil
Operating Temperature Range: -20°C to +80°C
Mounting: Flange or foot mount
Model-Specific Specifications
SGP1A16
Displacement: 16.2 cm³/rev
Maximum Pressure: 24.5 MPa (245 bar)
Rated Pressure: 20.6 MPa (206 bar)
Minimum Speed: 500 rpm
Maximum Speed: 4000 rpm
Weight: 3.3 kg
SGP1A18
Displacement: 18.3 cm³/rev
Maximum Pressure: 24.5 MPa (245 bar)
Rated Pressure: 20.6 MPa (206 bar)
Minimum Speed: 500 rpm
Maximum Speed: 4000 rpm
Weight: 3.4 kg
SGP1A20
Displacement: 20.4 cm³/rev
Maximum Pressure: 24.5 MPa (245 bar)
Rated Pressure: 20.6 MPa (206 bar)
Minimum Speed: 500 rpm
Maximum Speed: 4000 rpm
Weight: 3.5 kg
SGP1A23
Displacement: 23.7 cm³/rev
Maximum Pressure: 24.5 MPa (245 bar)
Rated Pressure: 20.6 MPa (206 bar)
Minimum Speed: 400 rpm
Maximum Speed: 4000 rpm
Weight: 3.7 kg
SGP1A25
Displacement: 24.9 cm³/rev
Maximum Pressure: 24.5 MPa (245 bar)
Rated Pressure: 20.6 MPa (206 bar)
Minimum Speed: 400 rpm
Maximum Speed: 3500 rpm
Weight: 4.0 kg
SGP1A27 / SGP1A-27L387
Displacement: 27.8 cm³/rev
Maximum Pressure: 24.5 MPa (245 bar)
Rated Pressure: 20.6 MPa (206 bar)
Minimum Speed: 400 rpm
Maximum Speed: 3500 rpm
Weight: 4.0 kg
SGP1A30 / SGP1A30R634
Displacement: 29.9 cm³/rev
Maximum Pressure: 24.5 MPa (245 bar)
Rated Pressure: 20.6 MPa (206 bar)
Minimum Speed: 400 rpm
Maximum Speed: 3000 rpm
Weight: 4.1 kg
SGP1A32 / SGP1A32A1HH1-L057C
Displacement: 33.2 cm³/rev
Maximum Pressure: 24.5 MPa (245 bar)
Rated Pressure: 20.6 MPa (206 bar)
Minimum Speed: 400 rpm
Maximum Speed: 3000 rpm
Weight: 4.2 kg
Mounting Flange: 6C flange
Housing Material: Cast iron
SGP1A34
Displacement: 34.1 cm³/rev
Maximum Pressure: 20.6 MPa (206 bar)
Rated Pressure: 18.6 MPa (186 bar)
Minimum Speed: 400 rpm
Maximum Speed: 3000 rpm
Weight: 4.3 kg
SGP1A36
Displacement: 36.6 cm³/rev
Maximum Pressure: 20.6 MPa (206 bar)
Rated Pressure: 17.2 MPa (172 bar)
Minimum Speed: 400 rpm
Maximum Speed: 3000 rpm
Weight: 4.5 kg
SGP2 / SGP2A Series Specifications
Displacement Range: 20.3 – 52+ cm³/rev (including 20/23/25/27/32/36/40/44/48/52, etc.)
Maximum Pressure: Up to 29.4 MPa (294 bar)
Rated Pressure: Up to 24.5 MPa (245 bar)
Maximum Speed: 3000 rpm
Minimum Speed: 400 rpm
Key Technical Advantages
1. Excellent Durability – Validated by One Million Impact Fatigue Tests
The SGP Series gear pumps have passed one million impact fatigue tests at 24.5 MPa. This rigorous testing verifies product reliability under long-term high-pressure impact conditions, ensuring extended service life across various demanding applications.
2. High Efficiency – High Volumetric and Mechanical Efficiency
Through precise and detailed design, the SGP Series gear pumps maintain high volumetric efficiency and high mechanical efficiency. Optimized gear meshing and precision machining effectively minimize internal leakage and mechanical friction losses, ensuring stable and efficient hydraulic power output under all operating conditions.
3. DU Bushings + Bimetal Side Plates for Excellent Wear Resistance
The bushings are equipped with DU bearings (self-lubricating composite bearings), and the side plates are made of bimetal material. DU bearings offer excellent self-lubricating properties and wear resistance; combined with the high strength and wear resistance of bimetal side plates, service life under high-pressure, high-speed conditions is significantly extended.
4. Three-Piece Split Housing + Axial/Radial Compensation for Low Noise and Low Pulsation
The SGP Series features a three-piece split housing design with axial clearance automatic compensation and radial hydraulic balance. This design effectively minimizes internal leakage and pressure pulsation, delivering low-noise operation. The aluminum body with high-precision design further reduces operating noise.
5. Wide Displacement Coverage and Flexible Configuration
The SGP1 Series offers 10 displacement options (16/18/20/23/25/27/30/32/34/36 cm³/rev); the SGP2 Series offers 10+ displacement options (20/23/25/27/32/36/40/44/48/52, etc.). Multiple port positions (rear port D / side port F), shaft types (H/H1/H2, etc.), and rotation directions (left-hand L / right-hand R) are available. The extensive selection ensures precise matching to diverse application requirements.
6. Broad Application Compatibility
The SGP Series gear pumps are widely used in construction machinery, industrial vehicles, material handling equipment, and agricultural/forestry/fishery machinery. They are particularly suitable for 1–3.5T electric forklifts and TCM forklifts, as well as Hyundai and Baoli brand forklifts.
Application Areas
Material Handling Equipment: 1–3.5T electric forklifts, TCM forklifts, Hyundai/Baoli forklift hydraulic systems
Construction Equipment: Excavators, wheel loader hydraulic systems
Agricultural Machinery: Tractors, agricultural/forestry/fishery machinery hydraulic systems
Industrial Vehicles: Hydraulic drive systems for various industrial vehicles
Civil Engineering Machinery: Construction machinery hydraulic systems
Material Handling Machinery: Crane and material handling equipment hydraulic systems
Industrial Hydraulic Systems: Various industrial hydraulic power units
Expert Maintenance Tips
1. Model Confirmation and Selection
Complete SGP1 series model should include: Series (SGP1) + Flange Code (A) + Displacement Code (16-36) + Port Position (D/F) + Port Type (H/H1/H2) + Mounting Type + Shaft Type + Rotation (L/R) + Design Number.
SGP1A30R634: SGP1 Series, A flange, displacement 30 (29.9 cm³/rev), R right-hand, design number 634.
SGP1A-27L387: SGP1 Series, A flange, displacement 27 (27.8 cm³/rev), L left-hand, design number 387.
SGP1A32A1HH1-L057C: SGP1 Series, A flange, displacement 32 (33.2 cm³/rev), 6C flange, L left-hand, design number 057C.
Verify system operating pressure (≤ 245 bar), displacement requirements, and rotation direction during selection.
SGP1A30 max speed: 3000 rpm; SGP1A16–23 max speed: 4000 rpm. Verify original drive speed during selection.
2. Pre-Installation Checks
SGP Series pumps have a fixed rotation direction (R = right-hand, L = left-hand) – verify matches system drive direction before installation.
Confirm mounting type (flange or foot mount) for compatibility with system interface.
Confirm port thread specifications (Inlet PT1″, Outlet PT3/4″) precisely match hydraulic fittings.
Never use hammer-driven installation – always use proper tools.
3. First Start-Up & Oil Priming
Prime the pump housing with clean hydraulic oil before first start-up; ensure suction line is fully filled – never run dry.
Recommended fluid: ISO VG 32–46 anti-wear hydraulic oil.
Maintain operating temperature within -20°C to +80°C.
Minimum speed requirements: SGP1A16–20 ≥ 500 rpm; SGP1A23–36 ≥ 400 rpm.
4. Filtration & Fluid Cleanliness
5. Operating Monitoring
Continuous operating pressure must not exceed 20.6 MPa; peak pressure must not exceed 24.5 MPa.
If abnormal noise or pressure fluctuation occurs, first check suction lines for leakage or blockage.
Regularly check torque on pump and piping connection bolts to prevent loosening from vibration.
