Daikin V38 Series Piston Pump Replacement | V38A2RX-80 V38A3RX Variable Pump

Genlu Hydraulic proudly introduces our V38 Series (as well as the V15 Series) high-performance swashplate-type variable displacement axial piston pumps. This family of variable pumps is custom-engineered to match the exact engineering standards of Daikin low-noise, high-efficiency industrial pumps. They are highly optimized for precision CNC machine tools, injection molding equipment, hydraulic stamping presses, and diverse automated plant factory power units. Our specialized production lineup perfectly covers key industry model codes, including V38A2RX-80, V38A1RX-95, V38A2RX-95, V38A3RX-95, and V15A3RX-95. Serving as the primary energy center for automated production machinery, Genlu unequivocally guarantees 100% Drop-in Interchangeability in SAE standard mounting flanges, driven shaft splines/keys, port configurations, and pressure/flow compensator performance curves relative to original Daikin pumps. Backed by our uncompromising 100% Simulation Load Testing, each pump is validated across continuous high-pressure cutoff vectors to certify outstanding volumetric efficiency and rapid transient response times.

Technical Specifications 

• Product Series: Daikin V38 / V15 Variable Displacement Axial Piston Pump Series

• Core Configuration Codes: V38A2RX-80, V38A1RX-95, V38A2RX-95, V38A3RX-95, V15A3RX-95

• Nominal Displacement Matrix: 37.7 cm³/rev for V38 series ; 14.8 cm³/rev for V15 series

• Max Operating Pressure Limits: 14 MPa – 21 MPa (Precisely matched per A1, A2, A3 regulatory compensator brackets)

• Pressure Adjustment Range (A1): 0.8 – 7 MPa (8 – 70 bar)

• Pressure Adjustment Range (A2): 1.5 – 14 MPa (15 – 140 bar)

• Pressure Adjustment Range (A3): 3.5 – 21 MPa (35 – 210 bar)

• Allowed Operational Speed Range: 600 – 1800 rpm

• Direction of Rotation: R (Right-hand / Clockwise, viewed from shaft input end)

• Control Architecture: X (Pressure Compensator Type, featuring a manual adjustment screw mechanism)

Key Technical Advantages:

• Ultra-Low Noise Acoustic Dampening Hull: Engineered with a specialized heavily ribbed cast body and custom-muffled decompression slots machined into the valve plate. Even during continuous 21 MPa full-pressure cutoff stages, the acoustic signature is held at an absolute minimum to enhance shop floor environments.

• Microsecond Rapid-Response Pressure Compensator: Equipped with a highly sensitive direct-acting pilot spool mechanism (A1/A2/A3 series). Upon meeting target system relief pressures, the compensator cross-shifts internally in milliseconds to destroke the swashplate tilt angle down to near-zero flow, reducing heat generation.

• Bimetallic Vacuum-Sintered Valve Interface: The valve plate face features advanced high-tin bronze vacuum-sintered onto a solid steel backing matrix. This provides superior anti-scuffing protection against thermal and velocity erosion under continuous high pressure, keeping volumetric efficiency above 93%.

• Hydrostatically Balanced Slipper-Piston Array: Piston heads and slippers are bound through a tight hydrostatic balance oil film layout, drastically lowering lateral parasitic forces against the swashplate track. Combined with premium hardened shaft bearings, the pump handles severe fluid pressure ripples.

Application Areas:

• High-Precision CNC Machine Tools: Main pressure supply for multi-axis spindle clamping, automatic tool changers, and high-frequency hydraulic chuck holding circuits.

• Specialized Manufacturing Equipment: Main hydraulic loop for compact plastic injection molding, rubber vulcanizing machinery, and precise sheet metal stamping presses.

• Automated Production & Power Units: Dedicated central power packs for automotive assembly lines and primary hydraulic fluid supply for multi-axis industrial robots.

Expert Maintenance Tips:

• Mandatory Pre-Start Housing Case Priming: The V38 series pump cavity must be completely pre-filled with clean hydraulic fluid through the upper case drain port prior to initial commissioning. Never jog or rotate the pump dry, as a lack of initial lubricating oil film will cause immediate bimetallic shoe galling.

• Isolate Case Drain Lines Straight to Reservoir: Internal housing backpressure interferes with the compensator feedback mechanism and shaft seals. Plumb the case drain tube as a dedicated run—completely bypassing any shared return lines or manifolds—terminating directly under the reservoir oil level. Maintain internal case pressures under 0.1 MPa.

• Lock Down the Jam Nut Post-Adjustment: When calibrating system pressure limits (manually adjusting the A1/A2/A3 control rod), turning clockwise increases the pressure cutoff threshold while turning counter-clockwise lowers it. Once your target metric is locked on a pressure gauge, firmly tighten the jam nut to prevent setting drift caused by structural micro-vibrations.