Product Overview
The SGP2A30L975M, SGP2A52L723, SGP1A31.9L438, as well as SGP1A30R634, SGP1A-27L387, and SGP1A32A1HH1-L057C 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. The SGP Series gear pumps are recognized for high pressure, compact cast iron construction, and excellent durability.
The SGP1 and SGP2 Series feature 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 SGP2 Series, as the higher-pressure version, features a special cast iron pump body that maintains stable high performance even under high-temperature, low-speed conditions. The SGP2 Series also adopts a ceramic coating special sealing structure for superior contamination resistance and wear resistance.
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 (A-type φ82.55 pilot, 2-bolt flange, SAE 13-tooth spline shaft), 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
30 / 52 / 31.9 = Nominal displacement (cm³/rev)
L / R = Rotation direction (L: left-hand / R: right-hand)
975M / 723 / 438 = 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
Bearings: DU bushings
Side Plates: Bimetal material
Seals: NBR
Recommended Fluid: ISO VG32 / VG46 anti-wear hydraulic oil
Operating Temperature Range: -20°C to +80°C
Model-Specific Specifications
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
SGP1A-27 / 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
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
SGP1A31.9L438 / SGP1A31.9D2H9-L438T
Displacement: 31.9 cm³/rev
Maximum Pressure: 25 MPa (250 bar)
Maximum Speed: 3300 rpm
Compatible Models: TCM/Tailift forklifts
SGP2 Series – General Specifications
Product Series: SHIMADZU SGP2 Series External Gear Pump
Pump Type: External gear pump with ceramic coating sealing structure
Displacement Range: 20 – 52.8 cm³/rev
Rated Pressure: 24.5 MPa (245 bar)
Maximum Pressure: 29.4 MPa (294 bar)
Housing Material: Special cast iron
Features: Ceramic coated pump body, high pressure resistance, contamination resistance
Recommended Fluid: ISO VG32 / VG46 anti-wear hydraulic oil
SGP2A30L975M
Displacement: 30.0 cm³/rev
Rated Pressure: 17.2 MPa (172 bar)
Maximum Pressure: 20.6 MPa (206 bar)
Mounting Flange: A-type φ82.55 pilot, 2-bolt flange
Drive Shaft: SAE 13-tooth spline shaft
Rotation: Counter-clockwise (CCW)
Speed Range: 500 – 2200 rpm
Weight: Approx. 6.1 – 6.8 kg
SGP2A52L723
Displacement: 52.8 cm³/rev
Rated Pressure: 17.2 MPa (172 bar)
Maximum Pressure: 20.6 MPa (206 bar)
Maximum Speed: 2494 rpm
Weight: Approx. 6.8 kg
Compatible Models: Forklift hydraulic systems
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. SGP2 Series Ceramic Sealing Structure for Superior Contamination and Wear Resistance
The SGP2 Series adopts a ceramic coating special sealing structure, delivering superior contamination resistance and wear resistance. Combined with DU bushings and bimetal side plates, service life under high-pressure, high-speed conditions is significantly extended.
3. High Efficiency – High Volumetric and Mechanical Efficiency
Through precise and detailed design, this series of gear pumps maintains 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.
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.
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, shaft types, and rotation directions (left-hand L / right-hand R) are available. The extensive selection ensures precise matching to diverse application requirements.
Application Areas
Forklift Hydraulic Systems: 1–3.5T electric forklifts (SGP1 Series preferred) and 4–10T forklifts (SGP2 Series widely used)
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
Expert Maintenance Tips
1. Model Confirmation and Selection
SGP1A30R634: SGP1 Series, A flange, displacement 30 (29.9 cm³/rev), R right-hand
SGP1A-27L387: SGP1 Series, A flange, displacement 27 (27.8 cm³/rev), L left-hand
SGP1A32A1HH1-L057C: SGP1 Series, displacement 32 (33.2 cm³/rev), L left-hand
SGP2A30L975M: SGP2 Series, displacement 30 cm³/rev, L left-hand
SGP2A52L723: SGP2 Series, displacement 52.8 cm³/rev, L left-hand
SGP1A31.9L438: SGP1 Series, displacement 31.9 cm³/rev, L left-hand
SGP2 Series rated pressure is 24.5 MPa, higher than SGP1 Series at 20.6 MPa. Verify system operating pressure requirements during selection.
SGP1A30 / SGP1A32 maximum speed: 3000 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 flange is A-type φ82.55 pilot, 2-bolt flange.
Confirm drive shaft is SAE 13-tooth spline shaft.
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 VG32 / VG46 anti-wear hydraulic oil.
Maintain operating temperature within -20°C to +80°C.
Minimum speed requirements: SGP1A30–36 ≥ 400 rpm; SGP2 Series speed range 500 – 2200 rpm.
4. Filtration & Fluid Cleanliness
Maintain fluid cleanliness at NAS 1638 Class 9 or better.
Regularly monitor fluid cleanliness to prevent contaminants from accelerating DU bushing, bimetal side plate, and ceramic sealing structure wear.
5. Operating Monitoring
SGP1 Series continuous operating pressure must not exceed 20.6 MPa; peak pressure must not exceed 24.5 MPa.
SGP2 Series continuous operating 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.
