GPYZ5.8R323B SHIMADZU Hydraulic Gear Pump 5.77cc 210bar

Product Overview

The GPYZ5.8R323B is a SHIMADZU GPY Series high-pressure external gear pump. 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.

The GPY Series features precision-machined gears with a high-strength housing design, delivering high efficiency, high reliability, lightweight construction, and compact structure. The series offers displacements from 2.98 to 11.55 cm³/rev, with rated pressures up to 20.6 MPa (210 kgf/cm²), intermittent peak pressures up to 22.6 MPa (230 kgf/cm²), and speeds ranging from 700 to 3,000 rpm.

This model, GPYZ5.8R323B, is a standard specification within the GPY Series with a displacement of 5.77 cm³/rev and right-hand (clockwise) rotation. The GPY Series high-pressure gear pumps are widely applied in injection molding machines, die-casting machines, lifting equipment, mining machinery, and vehicle hydraulic circuits.

As an original specification model within the SHIMADZU GPY line, this product enables direct form-fit-function interchangeability with original SHIMADZU units—no modifications to piping or mounting interfaces required. Our replacement solution strictly adheres to SHIMADZU technical standards and undergoes 100% simulated in-service testing to ensure performance, reliability, and service life identical to OEM products.

Technical Specifications 

Applicable Model (Primary):

• GPYZ5.8R323B

Related Models in Series:

• GPY-1R, GPY-2R, GPY-3R, GPY-4R, GPY-5.8R, GPY-6R, GPY-7R, GPY-8R, GPY-9R, GPY-10R, GPY-11.5R

Model Code Breakdown (per SHIMADZU naming convention):

• Product Series: GPY — SHIMADZU High-Pressure Gear Pump Series

• Displacement Code: 5.8 — 5.77 cm³/rev

• Rotation: R — Right-hand (clockwise, viewed from shaft end)

• Suffix: 323B — Specific port/flange configuration code

GPY Series Technical Specifications (per SHIMADZU official performance data):

• Product Series: SHIMADZU GPY High-Pressure Gear Pump

• Pump Type: External High-Pressure Gear Pump

• Body Material: High-Strength Aluminum Alloy / Cast Iron (model dependent)

• Rotation: R — Clockwise (viewed from shaft end); L — Counterclockwise

• Fluid Compatibility: Mineral Hydraulic Oil (ISO VG32, VG46, etc.)

• Operating Temperature Range: -20°C to +80°C (continuous), up to 90°C peak

• Inlet Vacuum: ≤ 0.03 MPa

• Volumetric Efficiency: ≥ 92% (at rated conditions)

• Overall Efficiency: ≥ 85%

Performance Parameters by Displacement Model:

GPY-3R — 2.98 cc/rev / Rated 210 bar / Peak 230 bar / Min 700 rpm / Max 3000 rpm / Weight 1.2 kg

GPY-4R — 4.09 cc/rev / Rated 210 bar / Peak 230 bar / Min 500 rpm / Max 3000 rpm

GPY-5.8R — 5.77 cc/rev / Rated 210 bar / Peak 230 bar / Min 700 rpm / Max 3000 rpm

GPY-7R — 7.07 cc/rev / Rated 210 bar / Peak 230 bar

GPY-8R — 8.01 cc/rev / Rated 210 bar / Peak 230 bar

GPY-9R — 8.94 cc/rev / Rated 210 bar / Peak 230 bar / Weight 1.4 kg

GPY-10R — 10.06 cc/rev / Rated 210 bar / Peak 230 bar

GPY-11.5R — 11.55 cc/rev / Rated 210 bar / Peak 230 bar / Max 2500 rpm

This Model (GPYZ5.8R323B) Detailed Specifications:

• Geometric Displacement: 5.77 cm³/rev

• Rated Operating Pressure: 20.6 MPa (210 kgf/cm² / 3,045 psi)

• Intermittent Peak Pressure: 22.6 MPa (230 kgf/cm² / 3,335 psi)

• Minimum Speed: 700 r/min

• Maximum Speed: 3,000 r/min

• Recommended Operating Speed: 1,200 – 2,500 r/min

• Rotation Direction: Right-hand (clockwise, viewed from shaft end)

• Operating Temperature Range: -20°C to +80°C

• Fluid Compatibility: Mineral Hydraulic Oil (ISO VG32, VG46)

• Volumetric Efficiency: ≥ 92% (at rated conditions)

• Overall Efficiency: ≥ 85%

• Inlet Vacuum: ≤ 0.03 MPa

Key Technical Advantages

1. High Efficiency Design — Low Energy Consumption
The GPY Series features precision-engineered construction that delivers high volumetric efficiency (≥ 92%) and high mechanical efficiency (≥ 85%). Optimized gear tooth profiles and relief groove structures effectively reduce flow pulsation and enhance high-speed adaptability.

2. Superior Durability and Reliability
The GPY Series gear pumps have passed one million shock fatigue tests at 24.5 MPa. High-hardness gear materials combined with precision heat treatment ensure excellent wear resistance and long service life. Advanced casting technology guarantees stable and reliable performance.

3. Lightweight Compact Design
The GPY Series features high-strength aluminum alloy bodies with lightweight and compact construction. The GPY-5.8R weighs only 1.2 kg, simplifying installation and maintenance—particularly advantageous for weight-sensitive mobile applications.

4. Wide Displacement Coverage with Flexible Configuration
The GPY Series offers displacements from 2.98 to 11.55 cm³/rev (3 ml/r ~ 11.5 ml/r), with multiple specifications from GPY-1R to GPY-11.5R. Both right-hand (R) and left-hand (L) rotation options are available. Mounting flanges and shaft configurations are compatible with most domestic and imported drive units, facilitating replacement and upgrades.

5. Excellent Sealing and Temperature Resistance
The GPY Series employs a combination of oil seals and mechanical face seals to withstand high and low pressure alternating conditions. Operating temperature ranges from -20°C to +80°C, with short-term peaks up to 90°C, making it suitable for a wide variety of industrial and mobile hydraulic environments.

Application Areas

• Injection Molding Machinery: Pressure oil supply for injection molding machine hydraulic systems

• Die-Casting Machinery: Die-casting machine hydraulic systems

• Lifting Equipment: Crane and lifting equipment hydraulic systems

• Mining Machinery: Hydraulic power systems for mining equipment

• Mobile Vehicles: Open/closed hydraulic circuits for construction machinery and mobile vehicles

• Industrial Hydraulic Systems: Hydraulic power units for various industrial equipment

Expert Maintenance Tips

1. Installation Precautions

• The GPY Series is a uni-directional rotation pump—verify that the system‘s required rotation direction matches the pump’s identification marking before installation. The suffix R indicates right-hand (clockwise) rotation.

• Ensure coaxial alignment between the pump and drive shaft; flexible couplings are recommended to avoid radial loads on the pump shaft.

• The suction line diameter must not be smaller than the pump inlet port; inlet vacuum should be maintained at ≤ 0.03 MPa.

2. Fluid Management

• Use mineral hydraulic oils conforming to ISO VG32 or VG46 standards.

• System fluid cleanliness must meet SHIMADZU-recommended standards; inspect fluid cleanliness before installation.

• Operating temperature should be maintained within -20°C to +80°C, with short-term peaks not exceeding 90°C.

• 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 210 bar) while monitoring noise, temperature, and system pressure for normal operation.

4. Routine Maintenance

• The GPY gear pump itself is 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.