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YUKEN A3H71 Series High pressure variable piston pump
YUKEN “A3H” series high pressure variable piston pump：
A3H16、A3H37、A3H56、A3H71、A3H100、A3H145、A3H180
E-mail: hyd-sales2009@outlook.com
Description
YUKEN Variable Displacement Piston Pump A3H71 Series Model & Parameter Explanation
1. Overview
YUKEN A3H71 series variable displacement piston pumps are high-pressure, heavy-duty hydraulic components belonging to the A3H product line, specifically designed for industrial applications requiring stable performance, flexible flow adjustment and large-displacement output. Adopting an axial swashplate structure, the A3H71 series features 0-100% stepless displacement adjustment, high volumetric efficiency, and strong load-bearing capacity, making it suitable for hydraulic systems in large-sized plastic injection molding machines, heavy-duty hydraulic presses, large-scale metal forming equipment, and other heavy-industry machinery. With standardized design and diversified control modes, it can perfectly adapt to various automation and heavy-load requirements of industrial production.
2. Core Technical Data (A3H71 Series)
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Parameter
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Specification
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Geometric Displacement (Vg)
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71 cm³/rev
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Speed Range
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Min: 700 min⁻¹; Max: 1800 min⁻¹
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Continuous Operating Pressure (pN)
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315 bar
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Intermittent Operating Pressure (pmax)
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400 bar (10% duty cycle, 10s)
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Flow Rate (1500 min⁻¹, 10 bar)
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106.5 l/min
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Flow Rate (1000 min⁻¹, 10 bar)
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71 l/min
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Flow Rate (1800 min⁻¹, 10 bar)
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127.8 l/min
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Minimum Drive Power (≈1 bar)
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5.3 kW
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Weight
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62 kg
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Inlet Pressure
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0.5 – 2.0 bar
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Volumetric Efficiency
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≥94% (at rated pressure and speed)
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Mechanical Efficiency
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≥88% (at rated pressure and speed)
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Noise Level
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72 – 82 dB(A) (at 1500 min⁻¹, no-load)
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3. Key Features
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Stepless Displacement Adjustment: Supports 0 – 100% stepless displacement adjustment through multiple control modes, effectively adapting to dynamic flow and pressure changes of large-scale hydraulic systems, reducing energy loss and improving system efficiency.
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High Pressure & Efficiency: Precision-machined axial swashplate and piston-cylinder structure ensure high volumetric efficiency (≥94%) and mechanical efficiency (≥88%) even under long-term high-pressure and large-displacement operation, ensuring stable output and low energy consumption.
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Diversified Control Modes: Available in manual control (M), hydraulic control (H), electro-hydraulic proportional control (EP), and load-sensitive control (LS), meeting different automation and control requirements of industrial systems for A3H71 series.
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Sturdy Structure & Easy Installation: Optimized heavy-duty design ensures strong load-bearing capacity and stability, with standardized flange and shaft sizes, facilitating integration with existing large-sized hydraulic systems and equipment replacement.
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Long Service Life: Adopts wear-resistant high-carbon alloy steel (SCM440) for piston and cylinder block, combined with optimized oil distribution and lubrication structure, ensuring stable operation and long service life in harsh heavy-industry environments.
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Low Noise Operation: Special damping and flow distribution design effectively reduces operating noise, with noise level controlled at 72 – 82 dB(A) (at 1500 min⁻¹, no-load), creating a comfortable working environment.
4. Hydraulic Fluid & Environmental Requirements
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Parameter
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Specification
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Permissible Fluids
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HL/HLP mineral oil (DIN 51524); Anti-wear hydraulic oil (ISO VG 46/68/100); Fire-resistant hydraulic oil (HFC/HEES)
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Operating Temperature
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-10 °C to +80 °C (short-term up to +100 °C)
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Ambient Temperature
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-15 °C to +65 °C
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Viscosity Range
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15 – 420 mm²/s; Maximum starting viscosity: 1500 mm²/s
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Fluid Cleanliness
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ISO 4406 (c) 18/16/13 (recommended); Minimum ISO 4406 (c) 20/18/15
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5. Model Code Structure (A3H71 Series)
5.1 Standard Ordering Code
Standard Ordering Code: A3H71-[Control Mode]-[Mounting Type]-[Shaft Type]-[Seal Type]
Note: The displacement segment is fixed as “71” for the A3H71 series, representing a geometric displacement of 71 cm³/rev.
5.2 Code Segment Explanation
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Segment
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Code
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Meaning
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Series & Displacement
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A3H71
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Axial piston pump, variable displacement, swashplate design, high-pressure industrial type, 71 cm³/rev displacement
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Control Mode
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M/H/EP/LS
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M: Manual control; H: Hydraulic control; EP: Electro-hydraulic proportional control; LS: Load-sensitive control
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Mounting Type
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F/B
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F: Flange mounting (ISO 3019-2); B: Foot mounting
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Shaft Type
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K/S
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K: Parallel keyed shaft (ISO 3019-2); S: Splined shaft (SAE J744)
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Seal Type
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N/V
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N: Nitrile rubber (NBR) seal; V: Fluorocarbon rubber (FKM) seal
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5.3 Model Examples & Explanations
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A3H71-M-F-K-N: A3H71 series, 71 cm³/rev, manual control, flange mounting, parallel keyed shaft, NBR seal, standard configuration.
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A3H71-EP-B-S-V: A3H71 series, 71 cm³/rev, electro-hydraulic proportional control, foot mounting, splined shaft, FKM seal, standard configuration.
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A3H71-LS-F-K-V: A3H71 series, 71 cm³/rev, load-sensitive control, flange mounting, parallel keyed shaft, FKM seal, suitable for energy-saving large-scale hydraulic systems.
6. Key Dimensions (Unit: mm, A3H71 Series)
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Dimension
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Value (±0.5)
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Description
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a
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265
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Overall length (flange to shaft end)
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b
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175
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Flange width
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d
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45
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Shaft diameter (K type, parallel keyed shaft)
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d1
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42
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Shaft diameter (S type, splined shaft)
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M
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M16×1.5
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Mounting thread
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H
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135
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Overall height (foot mounting type)
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7. Material Specifications (A3H71 Series)
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Component
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Material
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Housing & Flange
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High-strength cast iron (FC300) for enhanced durability and pressure resistance in heavy-load scenarios
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Cylinder Block & Piston
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High-carbon alloy steel (SCM440), heat-treated and precision-ground for superior wear resistance
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Swashplate & Valve Plate
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Wear-resistant alloy steel with tungsten carbide coating, ensuring long service life under heavy load
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Shaft
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Chrome-molybdenum alloy steel (SNCM439), quenched and tempered for high strength and impact resistance
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Bearings
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High-precision heavy-duty roller bearings and steel-backed copper-lead alloy bushes, suitable for large torque transmission
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Seals
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NBR/FKM rubber (depending on seal type), oil-resistant and high-temperature resistant, ensuring tight sealing under high pressure
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8. Applications (A3H71 Series)
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Plastic Injection Molding Machines: Suitable for large-sized injection molding machines, providing stable and large-displacement hydraulic power for mold clamping, injection and other processes, with flexible flow adjustment to adapt to different product molding requirements.
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Hydraulic Presses: Applied to heavy-tonnage hydraulic presses (500-1000 tons), ensuring stable pressure output and stepless flow adjustment, improving pressing efficiency and product quality in heavy forming operations.
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Heavy Industrial Equipment: Used in large-scale metal forming equipment, forging machinery, and hydraulic systems of metallurgical and mining equipment, providing high-pressure and large-displacement hydraulic power to meet heavy-load operation needs.
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Other Industrial Equipment: Suitable for large hydraulic power units, marine hydraulic systems, and auxiliary hydraulic systems in heavy industry, where large displacement and high pressure are required.
9. Important Notes (A3H71 Series)
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Displacement adjustment should be performed under no-load or low-load conditions (≤50% rated pressure) to avoid excessive mechanical stress and damage to internal components such as piston and swashplate, especially under large-displacement operation.
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Ensure precise alignment between the pump drive shaft and the motor shaft (coaxiality ≤0.15 mm) to prevent shaft deformation, bearing wear and abnormal noise, which is more critical for heavy-duty operation.
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Install a pressure relief valve (adjusted to ≤400 bar) and high-precision filter in the hydraulic system to protect the pump from overpressure and contamination, which is crucial for extending service life in heavy-load scenarios.
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Regular maintenance is required: replace hydraulic oil every 1500 – 2000 operating hours, and clean or replace the oil filter every 500 operating hours; check the oil level and oil quality regularly to ensure stable operation.
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Avoid long-term operation at low speed (below 700 min⁻¹) and high pressure, as this will reduce efficiency, increase energy consumption and shorten the service life of the pump.
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Check the seal for leakage regularly; replace the seal immediately if leakage is found to prevent oil loss and system contamination; NBR seals are not suitable for high-temperature environments (above 80 °C), please choose FKM seals if needed.
Source: YUKEN Official Product Catalog (2024) & Technical Specification Sheet for A3H71 Series.
The basic models of YUKEN A3H series hydraulic pumps are named according to the displacement size. Common models include：A3H16, A3H37, A3H56, A3H71, A3H100, A3H145, A3H180
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