YUKEN A3HG Series Variable Piston Pump: Complete Technical Specifications

YUKEN A3HG Series Core Technical Specifications

Key Specification Notes & Supplementary Parameters

• Pressure Conversion: The rated pressure of 31.5 MPa is equivalent to 315 kgf/cm², and the maximum pressure of 35.0 MPa is equivalent to 350 kgf/cm², which is 3.5 MPa higher than the A3H series, ensuring excellent high-pressure resistance in heavy-duty working scenarios[3].
• Control Types: The A3HG series offers 4 standard control modes to meet diverse system needs: pressure compensator type, external control pressure compensator type, external control with constant power control, and load sensing control. Detailed parameters for each control type can be obtained from YUKEN official channels.
• Efficiency Performance: Under the condition of 35.0 MPa (350 kgf/cm²) pressure and 1500 rpm shaft speed, the volumetric efficiency of the A3HG series can reach 95% or above, and the overall efficiency can reach 90% or above, realizing energy saving and high efficiency.
• Hydraulic Oil Requirements: Recommended hydraulic oils are petroleum-based anti-wear hydraulic oils or R&O (rust and oxidation inhibitor) hydraulic oils with ISO VG 32 or 46, and the viscosity range should be 20 to 400 mm²/s at 0-60°C to ensure stable operation[4].
• Permissible Suction Pressure: The suction port pressure of the pump should be between -0.167 and +0.5 kgf/cm² (gauge pressure) when the speed is 600-1800 rpm; if the speed exceeds 1800 rpm, the suction pressure should be adjusted to 0 to +0.5 kgf/cm² to avoid cavitation.
• Pressure & Flow Adjustment: For 01 type pressure compensator models: A3HG16/A3HG37/A3HG56 have a pressure adjustment range of 5.5 MPa per full turn of the adjustment screw; A3HG71/A3HG100/A3HG145 are 6.3 MPa; A3HG180 is 5.7 MPa. The flow adjustment screw can adjust the displacement flexibly, with specific adjustment volume varying by model.
• International Compatibility: The series complies with JIS, ISO 3019-2 (European standard) and SAE J744 (North American standard), with two standard shaft extension types: keyed and splined, ensuring interchangeability with global pumps[4][5].

Installation & Operation Specifications

• Drain Piping Size: For A3HG16 and A3HG37, the recommended inner diameter of the drain pipe is 12 mm (1/2”) or more; for A3HG56, A3HG71, A3HG100, A3HG145 and A3HG180, it is 19 mm (3/4”) or more to ensure smooth oil drainage.
• Mounting Method: The pump supports flange or foot mounting; during installation, ensure the “filling port” is at the top to avoid air accumulation. It also supports through drive, allowing direct installation of a slave pump on the driven side, with the maximum capacity of the slave pump equal to that of the drive pump.
• Temperature Range: When using petroleum-based hydraulic oil, the normal operating temperature range is 0°C to 60°C; the maximum short-term operating temperature should not exceed 75°C (no more than 30 minutes) to avoid damage to seals and internal components.
• Seal Material: The standard seal material is FKM (fluoro rubber), which has excellent high-temperature and oil resistance, adapting to the high-pressure working environment of the A3HG series.