Product Overview
The SGP1-36R114, SGP1-36, SGP1-32, and SGP1-27 are representative models of the SHIMADZU SGP1 series high-performance external hydraulic gear pumps. The SGP1 series offers displacements ranging from 16.2 to 36.6 cc/rev across 10 variants (SGP1-16 through SGP1-36), widely used in forklifts, construction machinery, agricultural equipment, and more.
The SGP1 series gear pump features automatic axial clearance compensation and radial hydraulic balance. With a three-piece construction design, the pump incorporates DU bushings (self-lubricating bearings) in the bearing blocks and bimetallic side plates; the front and rear covers are aluminum die-castings while the center section is cast iron. This precision-engineered combination effectively enhances performance and reliability. The SGP1 and SGP2 series use a specialized cast iron body designed to withstand adverse conditions of surge pressure, wide temperature, and wide speed ranges.
The SGP1 series offers excellent durability, having successfully withstood 1 million impact fatigue tests under 24.5 MPa conditions. Through precise structural design, the series maintains high volumetric and mechanical efficiency. The aluminum body with high-precision molding design ensures low-noise operation.
Engineered as a direct OEM-replacement solution, these models fully comply with SHIMADZU original design standards and mounting interface specifications, offering 100% direct interchangeability with OEM pumps. Every unit undergoes 100% workload simulation testing prior to shipment, rigorously validating pressure retention, volumetric efficiency, and internal leakage performance to meet or exceed OEM standards.
Model Code Breakdown
SGP1-36R114
SGP1 — Series: SHIMADZU SGP1 External Gear Pump
36 — Nominal size: Size 36 (actual displacement 36.6 cc/rev)
R — Rotation: R = Right-hand (clockwise, viewed from shaft end)
114 — Design/configuration code
SGP1-36
SGP1-32
SGP1-27
Technical Specifications
SGP1 Series General Specifications
Series: SHIMADZU SGP1 External Gear Pump
Displacement Range: 16.2 – 36.6 cc/rev (10 variants)
Rated Pressure: 20.6 MPa (approx. 206 bar)
Peak Pressure (Instantaneous): 24.5 MPa (approx. 245 bar)
Minimum Speed: 500 – 400 min⁻¹ (depending on size)
Maximum Speed: 4000 – 3000 min⁻¹ (depending on size)
Inlet Pressure: -0.02 – 0.2 MPa
Inlet Port: Ø25 mm
Outlet Port: Ø19 mm
Housing Material: Special cast iron (body) / Aluminum (front/rear covers)
Bearing Type: DU bushings (self-lubricating)
Side Plate Material: Bimetallic
Construction Type: Three-piece construction
SGP1-36R114 / SGP1-36 Specific Specifications
Model: SGP1-36R114 / SGP1-36
Theoretical Displacement: 36.6 cc/rev
Rated Pressure: 20.6 MPa (approx. 206 bar)
Instantaneous Peak Pressure: 20.6 MPa (approx. 206 bar)
Maximum Speed: 2987 min⁻¹
Minimum Speed: 400 – 500 min⁻¹
Rotation Direction: SGP1-36R114 = Right-hand (clockwise); SGP1-36 = configuration dependent
Weight: 4.5 kg
SGP1-32 Specific Specifications
Model: SGP1-32
Theoretical Displacement: 33.2 cc/rev
Rated Pressure: 20.6 MPa (approx. 206 bar)
Instantaneous Peak Pressure: 24.5 MPa (approx. 245 bar)
Maximum Speed: 3000 min⁻¹
Minimum Speed: 400 min⁻¹
Rotation Direction: Configuration dependent
Weight: 4.3 kg
SGP1-27 Specific Specifications
Model: SGP1-27
Theoretical Displacement: 27.8 cc/rev
Rated Pressure: 20.6 MPa (approx. 206 bar)
Instantaneous Peak Pressure: 24.5 MPa (approx. 245 bar)
Maximum Speed: 3500 min⁻¹
Minimum Speed: 400 min⁻¹
Rotation Direction: Configuration dependent
Weight: 4.1 kg
Key Technical Advantages
1. Automatic Axial Clearance Compensation & Radial Hydraulic Balance
The SGP1 series features advanced automatic axial clearance compensation and radial hydraulic balance technology, automatically adjusting internal clearances under varying operating pressures to minimize internal leakage and maintain high volumetric efficiency across the full pressure range.
2. Three-Piece Construction with DU Bushings – Long Life & High Reliability
The three-piece construction design incorporates DU bushings (self-lubricating bearings) in the bearing blocks and bimetallic side plates. High wear-resistant bearings ensure long service life even under high-pressure and high-speed operation. The pump has successfully passed 1 million impact fatigue tests at 24.5 MPa, demonstrating exceptional durability.
3. Special Cast Iron Body – Surge Pressure & Temperature Resistant
The SGP1 and SGP2 series use a specialized cast iron body designed to withstand adverse conditions of surge pressure, wide temperature, and wide speed ranges. It maintains high performance especially during high temperature and low speed operation.
4. High Efficiency & Low-Noise Operation
Through precise structural design, the series maintains high volumetric and mechanical efficiency. The aluminum body with high-precision molding design ensures low-noise operation. The pump features light weight, compact and exquisite structure.
5. Wide Displacement Coverage & Flexible Configuration Options
The SGP1 series offers 10 displacement options from 16.2 to 36.6 cc/rev. Flexible combinations of port positions (D: Rear / F: Side), mounting types, shaft types, and rotation directions (L: Left / R: Right) are available.
6. OEM-Proven Reliability
The SGP1 series is the preferred choice for 1–3.5T electric forklifts and is extensively used as OEM components for forklifts, construction machinery, agricultural equipment, and more.
7. 100% Factory Tested & Direct Interchangeability
Every unit undergoes 100% workload simulation testing prior to shipment, covering pressure retention verification, internal leakage detection, and flow validation. Fully compliant with SHIMADZU original design standards, with flange dimensions, shaft specifications, and mounting interfaces identical to OEM pumps—direct drop-in replacement with zero modifications required.
Application Areas
The SGP1 series gear pumps are widely used in the following equipment:
Forklifts: 1–3.5T electric forklift hydraulic lifting systems, steering systems
Construction Machinery: Civil construction machinery
Industrial Vehicles: Industrial vehicles
Handling Machinery: Material handling equipment
Agriculture, Forestry and Fishery Machinery: Agricultural, forestry and fishery machinery
Expert Maintenance Tips
1. Model Confirmation
The SGP1 series includes multiple displacement variants and configuration combinations. SGP1-36R114 is Size 36 (36.6 cc/rev) with right-hand rotation, SGP1-36 is the base Size 36 model, while SGP1-32 (33.2 cc/rev) and SGP1-27 (27.8 cc/rev) are other displacement options. Before installation, verify the complete model code on the original pump nameplate.
2. Rotation Direction Confirmation
Suffix “R” indicates right-hand rotation (clockwise, viewed from shaft end)
Suffix “L” indicates left-hand rotation (counter-clockwise, viewed from shaft end)
Before installation, always verify that the PTO rotation direction of the host machine matches the pump’s rotation direction—incorrect rotation will result in pump failure to prime and may cause severe damage to gears and bearings within a short period.
3. Installation Precautions
Thoroughly clean the mounting flange and shaft mating surfaces before installation to ensure no debris remains
SGP1 series features horizontal 2-bolt mounting
Use SHIMADZU-specified torque values for mounting bolts—avoid over-tightening which may cause housing distortion
Ensure correct connection of inlet port (Ø25 / PT1″) and outlet port (Ø19 / PT3/4″)
4. First Start-Up and Bleeding
Before first start-up, must fill the pump with hydraulic oil through the inlet port—never start dry
After start-up, run at low speed with no load for 2–3 minutes to ensure complete air evacuation from the system
Check for abnormal noise or leakage—aluminum housing pumps are particularly sensitive to cavitation
5. Fluid and Filtration
Use high-quality anti-wear hydraulic oil compliant with ISO VG 32–68 grades (engine oil is not recommended)
Maintain fluid viscosity within 9 – 430 mm²/s
Maintain inlet pressure within -0.02 ~ 0.2 MPa range
Maintain system oil cleanliness with filtration ≤ 25 μm recommended
6. Periodic Maintenance
Check mounting bolt torque every 1,000 operating hours
Regularly monitor system operating pressure—not to exceed 20.6 MPa rated pressure (24.5 MPa peak)
The SGP1 series is known for long service life and low maintenance requirements—nevertheless, regularly inspect shaft seals to prevent leakage
If flow output decreases, noise levels increase abnormally, or system temperature rises excessively, inspect and replace worn components promptly
