Yuken A37 Variable Piston Pump

The Yuken A Series is the industry standard for robust, high-performance variable displacement axial piston pumps. Featuring a heavy-duty cast-iron housing, the A37-F-R-01-H-K-32 model delivers a displacement of 36.9 cm³/rev and is equipped with a highly responsive “01” pressure compensator. This swashplate-design pump automatically adjusts its flow to maintain system pressure, significantly reducing power loss and fluid heating. It is the ultimate workhorse for continuous-duty industrial applications requiring high reliability and efficiency up to 21 MPa (210 bar).

Key Features:

Brand: Yuken
Series: A Series (Heavy-Duty Cast Iron)
Displacement: 36.9 cm³/rev
Pressure Range (H): 1.2 to 21 MPa (12 to 210 bar)
Design Feature: Pressure Compensator Control, Flange Mount.

Product Overview The Yuken A37 Variable Pump operates using a swashplate mechanism where the displacement is automatically altered in response to system pressure. As the pressure approaches the pre-set limit (adjusted via the compensator valve), the swashplate angle is reduced, decreasing the flow to near zero while holding the pressure. This “Load Sensing” characteristic makes the A series vastly more energy-efficient than fixed-displacement pumps.

Why Choose the Yuken A Series?

Cast-Iron Durability: Unlike lightweight aluminum pumps, the A series utilizes a rigid cast-iron body that absorbs vibration and withstands severe pressure spikes, guaranteeing an incredibly long service life in harsh factory environments.
Energy Efficient (01 Control): The standard pressure compensator ensures the pump only consumes the power strictly necessary for the machine cycle, lowering electricity costs and extending the life of hydraulic oil.
Low Noise: Yuken’s specialized port plate design minimizes pressure pulsations, ensuring the pump runs quietly even at maximum displacement and pressure.
Versatility: Available with a wide variety of control options (including proportional electro-hydraulic controls) to suit simple clamping circuits or complex automated machinery.

Common Applications:

Forming Machinery: Hydraulic presses, metal bending machines, forging presses.
Plastic Machinery: Standard injection molding machines.
Industrial Hydraulics: Main pump for centralized factory Hydraulic Power Units (HPUs) and heavy-duty test rigs.

Specification	Value / Description
Product Type	Variable Displacement Axial Piston Pump
Series	A Series (Standard / Cast Iron)
Displacement ( $V_{g max}$ )	36.9 cm³/rev (approx. 55 L/min at 1500 rpm)
Max. Operating Pressure	21 MPa (210 bar / 3050 psi)
Pressure Adj. Range (H)	1.2 – 21.0 MPa (12 to 210 bar)
Max. Speed	1800 r/min
Weight	Approx. 27.5 kg (Heavy-duty construction)
Model Breakdown	A 37 – F R – 01 – H – K – 32
– A	Series: Variable Displacement Piston Pump
– 37	Size / Displacement: 36.9 cm³/rev
– F	Type of Mounting: Flange Mounting
– R	Direction of Rotation: Right / Clockwise (viewed from shaft end)
– 01	Control Type: Pressure Compensator Control
– H	Pressure Adjustment Range: 1.2 to 21 MPa (High Pressure)
– K	Shaft Extension: Keyed Shaft (Standard)
– 32	Design Number