Yuken A3H56 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
YUKEN Variable Displacement Piston Pump A3H56 Series Model & Parameter Explanation
1. Overview
2. Core Technical Data (A3H56 Series)
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Parameter
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Specification
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Geometric Displacement (Vg)
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56 cm³/rev
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Speed Range
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Min: 800 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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84 l/min
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Flow Rate (1000 min⁻¹, 10 bar)
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56 l/min
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Flow Rate (1800 min⁻¹, 10 bar)
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100.8 l/min
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Minimum Drive Power (≈1 bar)
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4.2 kW
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Weight
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48 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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≥89% (at rated pressure and speed)
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Noise Level
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70 – 80 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 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 (≥89%) even under long-term high-pressure 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 A3H56 series.
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Compact Structure & Easy Installation: Optimized design reduces overall volume and weight (48 kg), with standardized flange and shaft sizes, facilitating integration with existing medium-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 industrial environments.
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Low Noise Operation: Special damping and flow distribution design effectively reduces operating noise, with noise level controlled at 70 – 80 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 32/46/68); 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 – 380 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 (A3H56 Series)
5.1 Standard Ordering Code
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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A3H56
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Axial piston pump, variable displacement, swashplate design, high-pressure industrial type, 56 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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A3H56-M-F-K-N: A3H56 series, 56 cm³/rev, manual control, flange mounting, parallel keyed shaft, NBR seal, standard configuration.
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A3H56-EP-B-S-V: A3H56 series, 56 cm³/rev, electro-hydraulic proportional control, foot mounting, splined shaft, FKM seal, standard configuration.
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A3H56-LS-F-K-V: A3H56 series, 56 cm³/rev, load-sensitive control, flange mounting, parallel keyed shaft, FKM seal, suitable for energy-saving hydraulic systems.
6. Key Dimensions (Unit: mm, A3H56 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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235
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Overall length (flange to shaft end)
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b
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155
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Flange width
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d
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40
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Shaft diameter (K type, parallel keyed shaft)
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d1
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38
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Shaft diameter (S type, splined shaft)
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M
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M14×1.5
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Mounting thread
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H
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120
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Overall height (foot mounting type)
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7. Material Specifications (A3H56 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 (FC250) for durability and pressure resistance
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Cylinder Block & Piston
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High-carbon alloy steel (SCM440), heat-treated for wear resistance
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Swashplate & Valve Plate
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Wear-resistant alloy steel with tungsten carbide coating
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Shaft
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Chrome-molybdenum alloy steel (SNCM439), quenched and tempered for high strength
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Bearings
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High-precision roller bearings and steel-backed copper-lead alloy bushes
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Seals
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NBR/FKM rubber (depending on seal type), oil-resistant and high-temperature resistant
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8. Applications (A3H56 Series)
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Plastic Injection Molding Machines: Suitable for medium-sized injection molding machines, providing stable 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 medium-tonnage hydraulic presses (100-500 tons), ensuring stable pressure output and stepless flow adjustment, improving pressing efficiency and product quality.
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Machine Tools: Used in CNC lathes, milling machines, grinding machines and other equipment, providing high-pressure hydraulic power for feed, clamping and other mechanisms, ensuring precise operation.
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Other Industrial Equipment: Suitable for metal forming equipment, hydraulic power units, and auxiliary hydraulic systems in metallurgy and mining, where medium displacement and high pressure are required.
9. Important Notes (A3H56 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.
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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.
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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.
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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.
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Avoid long-term operation at low speed (below 800 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.
Basic model
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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Export stocking: According to the requirements of the contract and the letter of credit, arrange production, purchase raw materials and packaging, and prepare the goods.
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Export inspection: Apply to the quality inspection department for export commodity inspection and provide relevant documents.
Apply for a write-off slip: apply for a write-off slip from the foreign exchange management department for subsequent foreign exchange write-off.
Export declaration: Declare exports to the customs and provide documents such as power of attorney for customs declaration, customs declaration form for export goods, commercial invoice, packing list, etc.
