A56 series Yuken Variable piston pump
Youyan A series variable piston pumps have a wide range of displacement, ranging from 10cm3/rev to 219cm3/Rev. Common displacement includes: A10, A16, A22, A37, A56, A70, A90, A145
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YUKEN A56 Series Variable Displacement Piston Pump: Models and Parameters
1. Model Specifications
1.1 Standard Model Format
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A56: Series number (geometric displacement: 56.0 cm³/rev)
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※ (1st): Mounting type – F: Flange mounting; L: Foot mounting
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R: Rotation direction (clockwise when viewed from the shaft extension end, standard type; counterclockwise is available on request)
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09: Control type – Constant power control
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※ (2nd): Power characteristics – G: 22kW; H: 30kW; I: 37kW; J: 45kW
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※ (3rd): Specified control pressure – 21M: 21MPa; 25M: 25MPa; 28M: 28MPa; 31.5M: 31.5MPa
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K: Design code
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32: Design number
1.2 Common Specific Models
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A56-F-R-09-G-25M-32
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A56-F-R-09-H-21M-32
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A56-F-R-09-I-31.5M-32
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A56-F-R-09-J-28M-32
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A56-L-R-09-G-21M-32 (Foot mounting type)
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A56-F-R-01-H-S-K-32 (Pressure compensator control type)
2. Key Technical Parameters
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Parameter Item
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Specification
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Remarks
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Geometric Displacement
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56.0 cm³/rev (3.42 cu.in./rev)
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Standard value of A56 series
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Minimum Adjustable Flow
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8 cm³/rev (0.488 cu.in./rev)
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Pressure compensator control type
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Rated Working Pressure
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25 MPa (3625 psi)
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Depends on power characteristics
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Maximum Working Pressure
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31.5 MPa (4565 psi)
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Intermittent working pressure; up to 35 MPa for special models
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Shaft Speed Range
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500 – 1500 r/min
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No load to full load operation; stable at medium and low speed
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Volumetric Efficiency
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Over 96.5%
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At 250 kgf/cm² and 1500 r/min
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Overall Efficiency
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Over 88.5%
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At 250 kgf/cm² and 1500 r/min
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Noise Level
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62 dB(A) max
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At full cut-off pressure 315 kgf/cm², 1500 r/min, 1m away from pump head cover
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Weight
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42.5 – 46.8 kg (93.7 – 103.2 lbs)
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Depends on mounting type (flange/foot) and control type
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Recommended Hydraulic Oil
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Petroleum-based anti-wear oil or R&O oil (ISO VG 46 or 68)
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Viscosity range: 20 – 400 cst (0 – 60℃); high-pressure resistance required
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Contamination Control
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NAS Grade 8
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Suction filter ≥100μm; return line filter ≤5μm; regular filter replacement recommended
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3. Supplementary Notes
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The maximum working pressure of the A56 series varies with power characteristics; refer to the power characteristic table for details, and avoid long-term operation at maximum pressure to extend service life.
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Counterclockwise rotation models and custom control types are available on request; please contact YUKEN or its authorized distributors for customization.
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The A56 series pump does not include pipe flange components and connecting bolts; please order separately according to the required flange type and installation specifications if needed.
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When installing the pump, ensure the filling port is positioned upwards and the installation surface is flat to avoid operational failures; regular maintenance of the oil filter and hydraulic oil replacement are recommended to extend the pump service life.
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Process steps：
Customer inquiry: Customers will make inquiries before placing an order to understand product details and communication needs.
Quotation: According to customer needs, provide a formal quotation, including the name, model, quantity, delivery time, payment method, etc. of the goods.
Order confirmation: After the customer confirms the quotation, a formal purchase order will be placed.
Confirm the delivery time: communicate the delivery time with the production department, inform the factory of the order details, and arrange the production plan.
Sign an export contract: After the two parties confirm that it is correct, sign an export contract to establish a trade relationship.
Implement the letter of credit (if applicable): If the payment method of the letter of credit is used, the customer needs to be urged to issue the certificate and review the contents of the letter of credit.
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.
Chartering and booking: Contact the freight forwarder to make a booking and arrange the transportation of goods.
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.
