A37-FR04EH215-01-42163 Yuken Axial Piston Pump 36.9cc 21MPa

Product Overview

The A37-FR04EH215-01-42163 is a Yuken A Series size 37 variable axial piston pump with a geometric displacement of 36.9 cm³/rev, rated working pressure of 16 MPa, and maximum operating pressure of 21 MPa. Featuring a swashplate variable design with electro-hydraulic proportional pressure and flow control (04E control type), the pump provides continuous proportional adjustment of pressure and flow via proportional solenoids, suitable for industrial hydraulic systems requiring precise pressure-flow control in injection molding machines, presses, and machine tools.

The Yuken A Series is a proven variable piston pump platform covering displacements from 10 to 145 cm³/rev. In the model code A37-FR04EH215-01-42163: “A37” denotes the series size (36.9 cm³/rev), “F” indicates flange mounting, “R” specifies clockwise rotation (viewed from shaft end), “04E” is the amplifier-separate electro-proportional pressure/flow control type, “H215” is the pressure adjustment range code, “01” is the design code, and “42163” is the special specification number.

The 04E electro-proportional control drives proportional solenoids via an external power amplifier, enabling stepless proportional adjustment of pressure and flow. Pressure control range covers 6.9 MPa to maximum operating pressure; flow control range is 2–66 L/min at 1800 rpm. Power supply is DC 24V with maximum power consumption of 30W. This control type enables precise matching of pump pressure and flow to actuator demand, achieving accurate process parameter control in multi-stage injection molding processes.

Manufactured to exact Yuken OEM specifications, mounting flange and port layouts are fully consistent with the original pump for true drop-in interchangeability. Every unit undergoes 100% simulated operating condition testing before shipment.

Technical Specifications 

• Model: A37-FR04EH215-01-42163

• Series: Yuken A Series (Size 37)

• Pump Type: Variable axial piston pump, swashplate design

• Control Type: 04E — Amplifier-separate electro-proportional pressure/flow control

• Geometric Displacement: 36.9 cm³/rev

• Rated Working Pressure: 16 MPa (2,320 psi)

• Maximum Operating Pressure: 21 MPa (3,045 psi)

• Minimum Adjustable Flow: 2 cm³/rev

• Flow Adjustment Range (at 1800 rpm): 2–66 L/min

• Minimum Speed: 600 rpm

• Maximum Speed: 1,800 rpm

• Pressure Adjustment Range: 6.9 MPa to maximum operating pressure (H215 code)

• Mounting Type: Flange mounting (F)

• Rotation Direction: Clockwise (R — viewed from shaft end)

• Mass (Flange Mounting): 32 kg

• Rated Current: 740 mA (flow control)

• Coil Resistance: 10 Ω (at 20°C)

• Hysteresis: 3% or less (flow control)

• Power Supply Voltage: DC 24V (21–28V including ripple)

• Maximum Power Consumption: 30 W

• Recommended Hydraulic Fluid: ISO VG32 equivalent, viscosity 20 mm²/s (at 50°C)

• Fluid Temperature: 50°C baseline (characteristic data)

Key Technical Advantages

1. Electro-Proportional Pressure/Flow Control for Precise Process Matching: The A37-FR04EH215-01-42163’s core feature is its 04E electro-proportional control. Driven by an external power amplifier, proportional solenoids provide continuous proportional adjustment of pressure and flow with hysteresis of 3% or less. In injection molding applications, operators can precisely set multi-stage injection pressure and speed via electrical signals, enabling flexible switching of multi-stage injection processes. High pressure control accuracy and repeatability meet the stringent requirements of precision injection molding and die-casting processes.

2. High Efficiency and Low Noise Operation: Yuken A Series piston pumps achieve volumetric efficiency exceeding 98% and overall efficiency exceeding 90% at 16 MPa rated pressure and 1800 rpm. The swashplate variable design produces low flow pulsation, and combined with optimized valve plate and noise-reduction structures, achieves noise levels among the lowest in industrial hydraulic pumps — suitable for injection molding workshops and environments with noise requirements.

3. Wide Flow Adjustment Range with Precise Control: The pump’s flow adjustment range is 2–66 L/min (at 1800 rpm) with a minimum adjustable flow of only 2 cm³/rev, maintaining precise control at low flow conditions. Pressure adjustment range covers 6.9 MPa to maximum operating pressure, flexibly set via external amplifier. This wide adjustment range enables a single pump to adapt to the full process cycle requirements of injection molding machines, from low-pressure mold clamping to high-pressure injection.

4. Yuken A Series Platform Drop-In Interchangeability: The A37’s mounting flange and port layout fully comply with Yuken A Series standards, enabling drop-in interchangeability with original pumps of the same specification. The A Series covers displacements from 10 to 145 cm³/rev with high consistency in mounting interfaces across sizes. No coupling, piping, or mounting base modification is required — dramatically reducing equipment downtime.

5. Robust Construction and Long Service Life: The high-strength cast iron housing and robust bearing-supported rotating group, with hardened wear-resistant materials on critical running surfaces, ensure reliable operation. Under normal maintenance conditions, the pump delivers continuous working pressure of 16 MPa with 21 MPa instantaneous peak capability, ensuring long-term stable operation in demanding industrial applications such as injection molding machines and presses.

Application Areas

• Injection Molding Machines: Hydraulic power source for small-to-medium injection molding machines with electro-proportional control for multi-stage injection processes

• Presses: Hydraulic presses, stamping machines — proportional pressure and flow control systems

• Die-Casting Machines: Die-casting machine hydraulic drive systems

• Machine Tools: CNC machine tools, machining centers, grinding machines — hydraulic power units

• Forging Equipment: Forging machinery hydraulic drives

• Industrial Hydraulic Systems: Various industrial hydraulic equipment requiring electro-proportional pressure-flow control

• Test Equipment: Hydraulic test stands, material testing machine proportional control systems

Expert Maintenance Tips

1. Shaft Alignment and Flange Connection: Concentricity deviation between the pump and drive shaft must be less than 0.05 mm, with angular deviation less than 0.25°. The A37-FR04EH215-01-42163 uses flange mounting. Tighten flange bolts in diagonal sequence for even loading. Check that the original mounting base locating step is in good condition — repair the base before installing a new pump if worn.

2. Initial Start-Up Filling and Bleeding: Pre-fill the pump with clean ISO VG32 equivalent hydraulic oil through the drain port before installation. The oil filler port must face upward during pump installation (Yuken A Series requirement). Start at the minimum speed of 600 rpm and observe a steady oil flow from the case drain port free of bubbles. Once bleeding is complete, gradually increase to working pressure.

3. 04E Electro-Proportional Control Connection Check: The 04E control requires an external power amplifier (model AME-D2-1010-11). Verify correct polarity of proportional solenoid wiring and rated current of 740 mA (flow control). Power supply is DC 24V with maximum power consumption of 30W. During commissioning, use a current meter to monitor control signals and ensure pressure-flow response matches system commands. Sensor output signals are DC 5V (flow and pressure) for closed-loop control feedback.

4. Rotation Direction Verification: This model is clockwise rotation (R — viewed from shaft end). Driving it counter-clockwise is strictly prohibited — incorrect drive direction will reverse the suction and pressure sides, causing severe rotating group damage within a short period.

5. Fluid Cleanliness and Viscosity Management: Use ISO VG32 equivalent hydraulic oil. System filtration should achieve β10 ≥ 75. Yuken A Series characteristic data is based on viscosity of 20 mm²/s at 50°C; adjust viscosity range according to actual operating temperature. Replace filter elements after the first 500 operating hours, then every 1,000 hours or annually thereafter.

6. Case Drain Line Configuration: The case drain line must return directly to the reservoir with backpressure not exceeding 0.3 MPa. The drain line inner diameter must be sufficient to ensure unobstructed drainage during cold-start high-viscosity conditions.