Technical Parameters of YUKEN Hydraulic Pumps A45-FR04E & A56-FR04E

1. Basic Information

• Models: A45-FR04E, A56-FR04E
• Brand: YUKEN
• Pump Type: Variable Displacement Piston Pump[3]
• Structure: Single plunger piston pump with integrated control mechanism, compact structure and stable operation

2. Displacement Parameters

• Model A45-FR04E Displacement: 45 cm³/rev (cubic centimeters per revolution) (nominal value)
• Model A56-FR04E Displacement: 56 cm³/rev (cubic centimeters per revolution) (nominal value)[2][3]
• Displacement Tolerance: ±5% (standard for YUKEN piston pump series)
• Displacement Adjustment: Stepless variable adjustment, adjustable within the range of 0 to nominal displacement

3. Pressure Parameters

• Rated Working Pressure: 16.0 MPa (2320 psi) for both models[2]
• Maximum Working Pressure: 21.0 MPa (3045 psi) (intermittent operation, no more than 10% of working time)
• Minimum Suction Pressure: -0.02 MPa (absolute pressure, no cavitation to avoid pump damage)
• Pressure Control Range: 1.2~16.0 MPa (matches the rated working pressure)[2]

4. Speed Parameters

• Rated Speed: 1500 r/min (revolutions per minute) for both models
• Maximum Speed: 1800 r/min (continuous operation)[2]
• Minimum Speed: 600 r/min (to ensure stable operation and sufficient suction)

5. Flow Parameters (at Rated Speed 1500 r/min)

• Model A45-FR04E Flow: Approx. 67.5 L/min (liters per minute) (calculated by displacement × speed)
• Model A56-FR04E Flow: Approx. 84 L/min (liters per minute) (calculated by displacement × speed)[2]
• Volumetric Efficiency: ≥98% (at 16 MPa, 1800 r/min)[2]
• Total Efficiency: ≥90% (at 16 MPa, 1800 r/min)[2]

6. Model Code Explanation

• A45/A56: Series code, indicating YUKEN variable displacement piston pump of A-series[3]
• F: Mounting type, flange mounting[2]
• R: Rotation direction, clockwise (viewed from the shaft end)[2]
• 04: Control mode, pressure compensation control type (standard configuration)
• E: Design feature, full hydraulic control type[1]

7. Fluid Requirements

• Recommended Fluid: Petroleum-based hydraulic oil (ISO VG 32, 46, 68)
• Fluid Temperature Range: -20°C to +80°C (operating); -10°C to +60°C (optimal)
• Fluid Cleanliness: NAS 8 or higher (ISO 18/15)
• Special Seals: Required for phosphate ester type fluids (consult YUKEN for details)

8. Installation & Dimensions

• Mounting Type: Flange mounting (conforms to SAE 4-bolt split flange standard)[2]
• Suction/Discharge Port: Single suction port and single discharge port (standard interface size)
• Shaft Extension: Flat key type (standard shaft extension specification)[2]
• Approximate Weight: 42 kg (A45-FR04E), 58 kg (A56-FR04E) (reference values for A-series piston pumps)

9. Performance Features

• Low Noise: Noise level ≤57.3 dB(A) (A56 series reference)[2], adopting low-noise structural design for comfortable working environment
• High Efficiency: Advanced design and precision manufacturing ensure high volumetric and total efficiency, energy-saving and low heat generation[2]
• Wear Resistance: High-strength plunger and cylinder block, good wear resistance, long service life
• Easy Maintenance: Simple structure, easy disassembly and assembly for daily maintenance and parts replacement

10. Application Scope

Widely used in machine tools, plastic machinery (injection molding machines, extruders), hydraulic presses, construction machinery, and other industrial fields that require stable pressure and variable flow control.

Notes

• Anti-clockwise rotation pump is available; consult YUKEN for details.
• When setting the pressure, ensure that the full cut-off pressure does not exceed the maximum allowable working pressure[2].
• When the pump is used above the rated value, the working conditions should be restricted (e.g., the running time at maximum flow should not exceed 6 seconds per cycle)[2].
• For detailed dimensional drawings and more precise parameters, refer to the official YUKEN product manual.