Yuken A Series Variable Piston Pumps for Injection Molding

The Yuken A Series represents the gold standard for variable displacement axial piston pumps within the plastic machinery industry. While the series encompasses a wide range of displacements—including the ARL16, AR22, A37, A56, A70, A90, and A145—two specific configurations, the A37-F-R-07-H-K-32 and A56-F-R-01-H-S-K-32, are engineered specifically to meet the high-cycle demands of modern injection molding machines.

These pumps are renowned for their robust cast-iron construction and their ability to maintain high volumetric efficiency even under continuous high-pressure operation. Whether used for clamping, injection, or screw rotation, these Yuken models provide the reliable hydraulic power necessary for precision plastic manufacturing.

Engineering & Control Advantages

Standardizing on these specific Yuken configurations ensures that your injection molding equipment operates with maximum uptime and energy efficiency.

A37-F-R-07-H-K-32 (Solenoid/Remote Control): This 37cc model features the “07” control type, which allows for sophisticated pressure management often required in complex molding cycles. The high-pressure “H” designation ensures it can handle the intense clamping forces required for large molds.
A56-F-R-01-H-S-K-32 (Pressure Compensator): This 56cc unit utilizes the “01” pressure compensator control. It automatically adjusts the pump’s displacement to maintain a preset system pressure, drastically reducing heat generation and power consumption during the holding phase of the injection cycle.
Low Noise Operation: Both models incorporate Yuken’s proprietary internal geometry to minimize pressure pulsations, ensuring a quieter factory environment.
High-Pressure Reliability: Rated for continuous operation up to 21 MPa, these pumps are built to withstand the rigorous pressure spikes common in hydraulic molding circuits.

Exact Technical Specifications Matrix

Feature	A37-F-R-07-H-K-32	A56-F-R-01-H-S-K-32
Displacement	36.9 cm³/rev	56.2 cm³/rev
Control Type	Type 07 (Remote/Solenoid Control)	Type 01 (Pressure Compensator)
Pressure Range	H (High Pressure up to 21 MPa)	H (High Pressure up to 21 MPa)
Mounting	F (Flange Mount)	F (Flange Mount)
Rotation	R (Clockwise)	R (Clockwise)
Shaft Type	K (Keyed Shaft)	K (Keyed Shaft)
Design Number	32	32