Open circuit pump w/ piston motor

  • Overview
  • Related products
  • Related solutions

Efficient performance

Danfoss continues to lead the industry with groundbreaking fan drive technologies like our reverse displacement motor (RDM). By occasionally changing the airflow direction, accumulations of debris can be dislodged from the vehicle’s radiator. This helps to ensure efficient cooling system performance.

When used in radiator cooling fan applications, the Danfoss RDM uniquely incorporates the external shift valve within the motor itself. This is eliminating the directional control valve, and either simplifying or completely eliminating the HIC block. With fewer components in the hydraulic circuit, the RDM frees up space in the engine compartment. This creates additional opportunities for innovation.

Design advantages like this help combat the challenges brought on by today’s harder-working, hotter-running Tier 4-compliant engines. Places where emission control equipment takes up more under-hood space than ever before. Building on our proven efficiency and reliability, the compact Danfoss RDM motor is technology that’s helping Danfoss engineer tomorrow.

Danfoss offers a wide range of efficient fan drive systems. Below are the benefits and critical considerations. You need to take these into account as you determine the right system for your specific needs.

Improvements in reversing fan drives

Improvements in reversing fan drives presentation


Increased efficiency due to variable flow and piston motor technology

Fan speed independent of engine speed

Fails to full fan speed

Motor speed sensors available

Higher motor pressure, power and life ratings

Less engine power consumption

Critical considerations

Back pressure required for axial piston motors

No ZERO speed capability

Larger reservoir capacity required for high flows

Motor thrust load capability must be calculated

Related products

  • if (isSmallPicture) { PLUS+1® MC microcontrollers; } else if (isBigColumns) { PLUS+1® MC microcontrollers } else { PLUS+1® MC microcontrollers }
    PLUS+1® MC microcontrollers

    Our powerful PLUS+1® microcontrollers bring intelligence to every node of a distributed control system. And they are equally effective for stand-alone control in smaller machines.

  • if (isSmallPicture) { PLUS+1® input/output modules; } else if (isBigColumns) { PLUS+1® input/output modules } else { PLUS+1® input/output modules }
    PLUS+1® input/output modules

    Our CAN-based PLUS+1® input/output (I/O) modules are stackable microcontroller add-ons providing smooth and effective hydraulic vehicle control functions.

  • if (isSmallPicture) { Variable displacement axial piston motors; } else if (isBigColumns) { Variable displacement axial piston motors } else { Variable displacement axial piston motors }
    Variable displacement axial piston motors

    We offer axial piston motors for open and closed-circuit systems, ranging from 20cc up to 250cc, with fixed, 2-position, and continuously variable displacement controls, including the zero-degree option.

  • if (isSmallPicture) { Reverse displacement axial piston motors; } else if (isBigColumns) { Reverse displacement axial piston motors } else { Reverse displacement axial piston motors }
    Reverse displacement axial piston motors

    Reverse displacement motors (RDM) are a key asset to decreasing system costs, boosting machine efficiency, and reducing service downtime. Our RDMs eliminate complex valving and leak points normally required to implement reversing of fan airflow, common to the cooling and cleaning systems of construction and agricultural equipment.

  • if (isSmallPicture) { Fixed displacement piston motors; } else if (isBigColumns) { Fixed displacement piston motors } else { Fixed displacement piston motors }
    Fixed displacement piston motors

    MP1 motor is our next generation of fixed displacement axial piston motors. MP1 motors deliver best-in-class package size and efficiency, installation versatility, and provide great solutions for propel, work function, and Fan Drive system for your mobile applications.


Related solutions