SGP1A20D1H2-L Shimadzu Gear Pump | 20.4cc 206 bar

Product Overview

The SGP1A20D1H2-L, SGP1A18F1H2-L, and SGP1A16D2H5-R are representative models of the SHIMADZU SGP1A series high-performance external hydraulic gear pumps, with displacements ranging from 16.2 to 20.4 cc/rev.

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 SGP1A series offers excellent durability, having successfully withstood 1 million impact fatigue tests under 24.5MPa 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 :

• SGP1A — Series: SHIMADZU SGP1A External Gear Pump

• 20 / 18 / 16 — Nominal displacement (20.4 / 18.3 / 16.2 cc/rev)

• D / F — Port position: D = Rear ports, F = Side ports on rear cover

• 1 / 2 — Port type: 1 = Flange ports, 2 = G threads

• H — Mounting: Horizontal 2-bolt

• 1 / 2 / 5 — Shaft type: 1 = SAE spline 13-tooth, 5 = SAE spline 10-tooth

• L / R — Rotation: L = Counter-clockwise, R = Clockwise (viewed from shaft end)

Technical Specifications

SGP1 Series General Specifications

• Series: SHIMADZU SGP1A External Gear Pump

• Rated Pressure: 20.6 MPa (approx. 206 bar)

• Peak Pressure: 24.5 MPa (approx. 245 bar)

• Inlet Port: Ø25 mm (PT1″)

• Outlet Port: Ø19 mm (PT3/4″)

• Inlet Pressure Range: -0.02 – 0.2 MPa

• Housing Material: Aluminum (front/rear covers) / Cast iron (center section)

• Bearing Type: DU bushings (self-lubricating)

• Side Plate Material: Bimetallic

• Construction Type: Three-piece construction

SGP1A20D1H2-L Specifications

• Model: SGP1A20D1H2-L

• Theoretical Displacement: 20.4 cc/rev

• Rated Pressure: 20.6 MPa (approx. 206 bar)

• Peak Pressure: 24.5 MPa (approx. 245 bar)

• Minimum Speed: 500 r/min

• Maximum Speed: 4000 r/min

• Weight: 3.5 kg

• Rotation Direction: Counter-clockwise (viewed from shaft end)

SGP1A18F1H2-L Specifications

• Model: SGP1A18F1H2-L

• Theoretical Displacement: 18.3 cc/rev

• Rated Pressure: 20.6 MPa (approx. 206 bar)

• Peak Pressure: 24.5 MPa (approx. 245 bar)

• Minimum Speed: 500 r/min

• Maximum Speed: 4000 r/min

• Weight: 3.4 kg

• Rotation Direction: Counter-clockwise (viewed from shaft end)

SGP1A16D2H5-R Specifications

• Model: SGP1A16D2H5-R

• Theoretical Displacement: 16.2 cc/rev

• Rated Pressure: 20.6 MPa (approx. 206 bar)

• Peak Pressure: 24.5 MPa (approx. 245 bar)

• Minimum Speed: 500 r/min

• Maximum Speed: 4000 r/min

• Weight: 3.3 kg

• Rotation Direction: Clockwise (viewed from shaft end)

Key Technical Advantages

1. Automatic Axial Clearance Compensation & Radial Hydraulic Balance
The SGP1A 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 24.5MPa, demonstrating exceptional durability.

3. 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.

4. Optimized Material Combination – Lightweight & High Strength
The front and rear covers are aluminum die-castings while the center section is cast iron. This material combination delivers structural strength while achieving lightweight design (just 3.3–3.5 kg total weight), effectively reducing overall machine weight.

5. Wide Displacement Coverage & Flexible Configuration Options
The SGP1A series offers 10 displacement options from 16.2 to 36.6 cc/rev. SGP1A20D1H2-L (20.4 cc/rev), SGP1A18F1H2-L (18.3 cc/rev), and SGP1A16D2H5-R (16.2 cc/rev) cover the typical range from small to medium displacements. Flexible combinations of port positions (D: Rear / F: Side), port types (flange / G threads), shaft types, and rotation directions (L: Counter-clockwise / R: Clockwise) are available.

6. OEM-Proven Reliability
The SGP1A series 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 SGP1A series gear pumps are widely used in the following equipment:

• Forklifts: Hydraulic lifting systems, steering systems

• Construction Machinery: Excavators, loaders, and other mobile machinery

• Industrial Vehicles: Industrial vehicles

• Handling Machinery: Material handling equipment

• Agriculture, Forestry and Fishery Machinery: Agricultural, forestry and fishery machinery

• Civil Construction Machinery: Building machinery

Expert Maintenance Tips

1. Model Confirmation
SGP1A20D1H2-L offers 20.4 cc/rev, SGP1A18F1H2-L offers 18.3 cc/rev, and SGP1A16D2H5-R offers 16.2 cc/rev displacement. Before installation, confirm the correct displacement based on system flow requirements and verify the complete model code on the pump nameplate.

2. Rotation Direction Confirmation

• Suffix “L” indicates counter-clockwise rotation (viewed from shaft end)

• Suffix “R” indicates clockwise rotation (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

• SGP1A 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

• Maintain inlet pressure within -0.02 ~ 0.2 MPa range

• Maintain operating temperature within 30–90℃

• 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 SGP1A 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