Piston Motors

Piston Motors

Piston Motors in Stock

Piston motors are high-performance hydraulic motors that convert hydraulic pressure and flow into mechanical torque and rotation through a series of reciprocating pistons. Engineered for high-pressure, high-speed, and heavy-duty operation, piston motors deliver exceptional power density, efficiency, and precise speed control, making them the preferred choice for demanding hydraulic drives. Our inventory spans axial piston motors (swashplate and bent-axis) and radial piston motors in fixed and variable displacement configurations, engineered for mobile, industrial, and marine applications.

Hengyuhang combines robust manufacturing capacity with specialized engineering expertise to produce high-quality piston motors. Manufactured to stringent international quality standards, our piston motors deliver the reliability, efficiency, and long service life required to serve as direct, drop-in replacements for leading international brands. When standard equipment cannot meet specific technical demands, our facility designs and manufactures entirely custom piston motor solutions — from rapid prototyping to full-scale production — engineered strictly to your operational parameters and application needs.

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What Is a Piston Motor?

A piston motor is a hydraulic motor that converts hydraulic energy into mechanical torque and rotation using reciprocating pistons arranged around a shaft. Pressurized fluid acts on the pistons, which push against a swashplate, bent-axis flange, or cam ring to produce smooth, continuous rotation of the output shaft. Piston motors are valued for their high power density, excellent efficiency across a wide speed range, and ability to sustain high pressure and temperature, making them ideal for the most demanding hydraulic drive systems.

Types of Piston Motors

Piston motors are generally classified by their piston arrangement and displacement control.

Axial piston motors arrange pistons parallel to the output shaft. They are further divided into swashplate and bent-axis designs, offering high speed, high pressure, and variable displacement for precise control.

Radial piston motors arrange pistons radially around the output shaft against a cam ring, delivering extremely high torque at low speed for heavy-duty, direct-drive applications such as winches, slew drives, and wheel drives.

Fixed displacement piston motors maintain a constant displacement, while variable displacement piston motors allow the displacement to be adjusted, providing flexible speed and torque control within a single unit.

Applications of Piston Motors

Piston motors power high-pressure, high-performance rotary functions across a wide range of industries:

  • Construction machinery — excavators, cranes, drilling rigs

  • Agricultural equipment — harvesters, sprayers

  • Marine and offshore — winches, deck machinery, propulsion drives

  • Mining and material handling equipment

  • Industrial presses and injection molding machines

  • Slew drives, wheel drives, and track drives

  • Forestry and specialized mobile machinery

Features of Piston Motors

  • High power density with excellent torque-to-weight ratio

  • High efficiency across a wide speed and pressure range

  • Capable of sustained high-pressure, heavy-duty operation

  • Precise speed control with variable displacement options

  • Wide displacement range and versatile mounting configurations

  • Direct interchangeability with leading international brand models

Techspecs of Piston Motors

Typical specification range (customized to each model):

ParameterTypical Range
Displacement10 – 500 cc/rev
Max. continuous pressureup to 450 bar
Max. torqueup to 3000 Nm
Speed range50 – 5000 rpm
Direction of rotationbidirectional
Displacement controlfixed or variable
Port typethreaded or flange
Mounting flangeSAE A / SAE B / SAE C / ISO
Shaft typekeyed, splined
Operating temperature-20 °C to +80 °C
Fluid viscosity10 – 800 cSt

Contact us for the exact specification sheet of any specific model.

Piston Motor Replacement

Hengyuhang piston motors are engineered as direct, dimensionally interchangeable replacements for leading international brands, delivering equal or better performance at a competitive price with long service life. Our replacement range covers:

ARGO-HYTOS, ASEDA, ATOS, B&C, BLUEASCEND, Boden, BONDIOLI, Brevini, BUCHER, Caproni, CASAPPA, CONCENTRIC, DANFOSS, DAVID BROWN, DUPLOMATIC, ECKERLE, Galtech, GPD, GRH, HANSA-TMP, HESPER, HIDRAULICA, HOERBIGER, HONOR, HPI, HYDAC, HYDRECO, HYDROMAX, HYDRONIT, HYTEK, JCB, JIHOSTROJ, JOYANG, KOMPASS, KOMATSU, KRACHT, MARZOCCHI, MetaHydra, METARIS, NACHI, NIHON SPEED, OKDO, PARKER, PERMCO, REXPOWER, Rexroth, REXROTH-SIGMA, RONZIO, ROQUET, SALAMI, SCENERY, SDH, SETTIMA, SHIMADZU, STEIMEL, SUMITOMO, SUNNY, VIVOLO, VOITH.

Simply tell us your existing model number, and we will match the correct interchange.

Piston Motor Selection Guide

To select the right piston motor, confirm the following parameters:

  1. Required torque (Nm), speed (rpm), and power

  2. Displacement (cc/rev) and available flow and pressure

  3. Fixed or variable displacement requirement

  4. Axial or radial configuration, mounting style, and shaft type

  5. Direction of rotation and port orientation

When in doubt, provide your existing motor model or application details, and our engineers will recommend the optimal match.

Piston Motor OEM Service

Hengyuhang provides high-quality piston motor OEM batch customization and production services. You can supply your own design and drawings, or let our engineering team design the motor to your specification. We offer flexible branding options — private label (your logo / part number) or no label — with full support from prototyping and testing to mass production and consistent quality control.

Piston Motor Manufacturer

Hengyuhang is a professional piston motor manufacturer and supplier, offering a complete range of standard and custom piston motors with reliable quality, competitive pricing, and dependable delivery to customers worldwide.

FAQ of Piston Motors

1. What is a piston motor used for?
Piston motors are used to drive high-pressure, high-performance rotary functions such as excavator slew drives, crane winches, drilling rigs, marine deck machinery, and heavy industrial equipment.

2. What is the difference between an axial piston motor and a radial piston motor?
An axial piston motor arranges pistons parallel to the output shaft, offering high speed and variable displacement. A radial piston motor arranges pistons radially against a cam ring, delivering very high torque at low speed for direct-drive applications.

3. What is the difference between a fixed and a variable displacement piston motor?
A fixed displacement piston motor maintains constant displacement, while a variable displacement piston motor allows displacement to be adjusted for flexible speed and torque control.

4. What types of piston motors are available?
Piston motors are available in axial (swashplate and bent-axis) and radial configurations, in fixed and variable displacement versions.

5. Can your piston motors replace other brands?
Yes. Our piston motors are engineered as direct, dimensionally interchangeable replacements for leading international brands including Parker, Rexroth, Danfoss, Eaton, Casappa, Sauer, and many others.

6. Do you offer custom or OEM piston motors?
Yes. We offer OEM batch customization — you can provide the design, or we can design the motor to your specification, with optional private labeling.

7. What is the MOQ for OEM orders?
MOQ is flexible depending on the model and customization requirements. Contact us for a tailored quotation.

8. What is your lead time?
Lead time depends on quantity and customization. Standard models ship quickly; custom orders are confirmed at quotation.

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