Parameter Description of YUKEN Variable Displacement Piston Pump Model A90-LR01AS-60

1. Model Code Interpretation

• A90: Series identifier, indicating the A90 series variable displacement piston pump with a basic geometric displacement of 91.0 cm³/rev.
• L: Mounting type, meaning foot-mounted installation (F for flange-mounted, L for foot-mounted).
• R: Rotation direction, indicating clockwise rotation when viewed from the shaft end (standard rotation direction).
• 01: Control type, representing pressure compensation control, which can dynamically adjust the flow according to the load demand to maintain stable system pressure and reduce energy loss.
• A: Pressure adjustment range and interface-related specification, matching the overall design of the pump to ensure stable pressure control.
• S: Port position, indicating side-mounted inlet and outlet ports.
• 60: Design number, corresponding to the standard design specification of the A90 series, ensuring the interchangeability of accessories and parts.

2. Core Technical Parameters

3. Performance Characteristics

• High Efficiency & Energy Saving: With high volumetric and overall efficiency, the pump has sharp cut-off characteristics, which can effectively reduce input power and energy consumption, meeting the energy-saving requirements of industrial equipment.
• Low Noise & Low Heat Generation: The optimized structural design reduces noise and power loss, thereby lowering the temperature rise of hydraulic oil, which can reduce the capacity requirement of the oil reservoir.
• Stable Variable Control: Adopting pressure compensation control (code “01”), it can automatically adjust the displacement according to the system load, maintain stable system pressure, and adapt to the changing working conditions of equipment such as metallurgy and machinery.
• Strong Durability: Key components (such as plungers and cylinder blocks) are made of ausferritic ductile iron or high-strength alloy steel, which are precision machined and heat-treated, featuring excellent wear resistance and corrosion resistance, and can adapt to harsh industrial environments.

4. Installation & Operation Requirements

• The pump adopts foot-mounted installation, and the installation surface should be flat and firm to avoid vibration during operation, which may affect the service life of the pump.
• When using steel pipes for the suction or discharge ports, avoid excessive load from the pipeline on the pump to prevent abnormal noise.
• The recommended hydraulic oil should meet the viscosity and temperature requirements, and the oil cleanliness should be maintained at NAS 8 level or above to prevent impurities from damaging the variable mechanism and sealing components.
• At the time of shipment, the pump is preset to the maximum displacement and minimum discharge pressure; the flow can be adjusted by turning the flow adjustment screw (clockwise rotation reduces the displacement).

5. Maintenance & Attention

• Check the wear of sealing components every 500 hours, and replace the hydraulic oil and oil filter every 2000 hours to ensure the normal operation of the pump.
• Regularly monitor oil level, oil temperature, system pressure, vibration and noise; if abnormalities are found, stop the machine for inspection in time to avoid further damage.
• The maximum peak pressure should not be used for a long time; it is recommended that the single continuous use time does not exceed 10 seconds, and the cumulative use time accounts for no more than 5% of the total operating time.
• For detailed installation dimensions, performance curves and other information, please refer to the official sample manual of YUKEN or contact the agent for technical support.