Danfoss introduces reverse displacement motor (RDM)

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Danfoss is introducing the innovative Reverse Displacement Motor (RDM). The open circuit piston motor offers reverse circuit functionality without external valves — an unprecedented hydraulic system approach for mobile equipment applications. The RDM enables customers to achieve up to 10 per cent power savings, a 15 per cent average reduction in total system cost, and reduced system complexity.

The RDM is built on the proven efficiency and reliability of the L/K Axial Piston Motor from Danfoss. The compact motor features a 12V integrated proportional shifting valve that allows smooth, on-the-go reversing using system pressure. This simplified design eliminates the need for additional components, cost and pressure losses associated with the external valves and pressure supply necessary in typical reversing products. Complementary to the Danfoss Series 45 open circuit axial piston pumps, PLUS+1 microcontrollers and DP700 PLUS+1 mobile machine displays, the RDM is suitable for fan drive systems in Tier 4 agriculture, forestry and construction equipment applications. The reverse functionality of the RDM enables the fan to purge trapped dirt and debris, restoring cooling efficiency. Danfoss fan drive packages including the RDM can be tuned to meet the cooling requirements of Tier 4 equipment applications.

John Heller, Product Marketing Manager at Danfoss Power Solutions, says: “At Danfoss, we’re dedicated to being our OEM’s strongest partner in mobile hydraulics. We understand how much OEMs have invested in meeting Tier 4 emissions regulations, and how much their customers value power savings. We know OEMs depend on our expertise, and we’re pleased to offer the Reverse Displacement Motor, an industry-exclusive solution that conserves horsepower while minimising system cost and complexity for the OEM.”

In addition to fan drives, the RDM is well suited for a full range of applications with the need for reversing capability, including conveyors, auger boring machines and directional drills.

In fan drive applications, the RDM is designed to protect the equipment. In the event of a controller or electrical failure, the fault position of the motor is biased to maximum forward speed, enabling the fan to maintain the integrity of the cooling system on the machine.

To learn more about the Reverse Displacement Motor, please visit

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