Parameters of YUKEN Piston Pumps Models ASE and ASR Series

1. Model Interpretation

1.1 Model Coding Rules (Unified for Both Series)

• A: Series code, indicating YUKEN A series variable displacement axial piston pump with swash plate design for high pressure and high efficiency operation.
• S: Sub-series code, indicating “Standard” configuration with optimized performance for general industrial applications.
• E/R: Control type code, indicating the specific control mechanism:
  • E: Electro-hydraulic proportional control (proportional solenoid for remote flow and pressure adjustment with electronic feedback).
  • R: Pressure compensator control (automatic flow adjustment based on system pressure to maintain constant pressure).
• Additional Codes: Complete model typically includes:
  • Nominal displacement: 16, 22, 37, 56, 70, 90, 100, 145 (cm³/rev)
  • Mounting type: F (flange mounting), L (foot mounting)
  • Rotation direction: R (clockwise viewed from shaft end), L (counterclockwise)
  • Design number: 01/02/03 indicating specific design variations

2. Technical Parameters

2. Product Features

2.1 Common Features (Applicable to Both Series)

• Swash Plate Design: Compact structure, high power density, and excellent mechanical efficiency (up to 95%) for high pressure and high flow applications.
• Variable Displacement: Allows precise adjustment of flow rate from 0 to maximum displacement, improving energy efficiency and reducing system heat generation.
• High Pressure Capability: Continuous operating pressure up to 31.5 MPa, peak pressure up to 35 MPa, suitable for heavy-duty hydraulic systems.
• Low Noise Operation: Special design reduces operating noise by up to 5dB compared to conventional piston pumps, ideal for noise-sensitive environments.
• High Reliability: Adopts high-quality materials and precision manufacturing processes, ensuring long service life (≥10,000 hours) and stable operation under harsh conditions.
• Easy Maintenance: Modular design, easy to disassemble and maintain, with replaceable wear parts for cost-effective maintenance.
• Multiple Mounting Options: Available in flange (F) and foot (L) mounting configurations for flexible installation in various hydraulic systems.

2.2 Series-Specific Features

• ASE Series (Electro-hydraulic Proportional Control):
  • Enables remote flow and pressure adjustment via electrical signals, improving system automation and controllability.
  • Equipped with electronic feedback for precise control and monitoring of pump output.
  • Ideal for industrial machinery requiring precise flow control, such as injection molding machines, metalworking equipment, and plastic processing machinery.
  • Compatible with various control systems (PLC, PC-based controllers) for seamless integration into automated production lines.
• ASR Series (Pressure Compensator Control):
  • Automatic flow adjustment based on system pressure to maintain constant pressure, reducing energy consumption during low load conditions.
  • Simplified design with fewer electronic components, resulting in lower cost and higher reliability for basic hydraulic systems.
  • Ideal for applications requiring constant pressure control, such as hydraulic presses, clamping systems, and material handling equipment.
  • Easy to operate and maintain, with manual adjustment options for pressure setting and system optimization.

3. Application Fields

• ASE Series: Injection molding machines, metalworking equipment (CNC lathes, milling machines), plastic processing machinery, automated production lines, and precision hydraulic systems requiring electronic control and monitoring.
• ASR Series: Hydraulic presses, clamping systems, material handling equipment, construction machinery, and basic hydraulic systems requiring constant pressure control and simplified operation.

4. Typical Model Variations

5. Installation and Operation Notes

• Before installation, check the pump model, nominal displacement, control type, and rotation direction to ensure they match the system requirements.
• Mount the pump on a rigid base using suitable mounting bolts and torque specifications (refer to YUKEN technical documentation) to prevent vibration and ensure stable operation.
• Align the pump shaft with the prime mover (motor/engine) shaft accurately (concentricity ≤ 0.1 mm) to avoid shaft bending and bearing damage.
• Use a flexible coupling to connect the pump and prime mover, absorbing vibration and reducing mechanical stress on the shaft and bearings.
• Connect the hydraulic lines correctly: pressure port (P) to the system pressure line, tank port (T) to the oil tank line, and control ports (X/Y) to the control system lines; reverse connection will cause pump failure and system damage.
• Fill the pump with hydraulic oil before starting to ensure proper lubrication of internal components and prevent dry running.
• Prime the pump by rotating the shaft manually (5-10 revolutions) to remove air from the pump and hydraulic lines before starting.
• Start the pump at low speed (≤1000 rpm) and no load, gradually increasing the speed and load to the rated values to avoid sudden pressure changes causing equipment damage.
• Maintain hydraulic oil cleanliness at NAS 7 level or higher, and install a high-precision filter (≥10 μm) in the system to prevent impurities from damaging the pump’s internal components (swash plate, piston, cylinder block).
• The operating temperature of the hydraulic oil should be controlled within -10°C to 80°C; excessive temperature will affect the service life of the seal and pump performance.
• Regularly inspect the pump for oil leakage, abnormal noise, and pressure fluctuations; if any abnormality is found, stop the system immediately for inspection and maintenance.
• When adjusting the flow or pressure, follow the YUKEN technical manual and ensure the system is in a safe state to avoid injury or equipment damage.
• When replacing parts, use only genuine YUKEN replacement parts to ensure compatibility and maintain pump performance; non-genuine parts may cause reduced efficiency, increased noise, and premature failure.
• Do not disassemble the pump without authorization; if maintenance is required, refer to the YUKEN technical manual or contact professional maintenance personnel.
• Store the pump in a dry, clean, and well-ventilated environment when not in use, protecting it from dust, moisture, and corrosion.