Data Sheet
Open Circuit Piston Motors
Reverse Displacement Motor (RDM)
For more than 40 years, Danfoss has been developing state-of-the-art components and systems for mobile machinery used in off -highway operations around the world. We have become a preferred supplier by offering the best of what really matters: the hardware inside your vehicle application.
The Reverse Displacement Motor (RDM) is designed for use in mobile open circuit applications. It offers reverse functionality without external valves, and provides system robustness with available anticavitation and shock valves. The RDM uses the existing and proven technology of the Danfoss L/K motor. These motors have been optimized with regard to options, life, package size and installed cost.
The RDM is a two-position reversing motor, with smooth, shift-on-the-go capability. The integrated proportional shifting valve uses system pressure. It allows reversing functionality without external valves and external pressure supply.
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Designed for Durability and Flexibility |
Wide Range of Options |
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‒ Metric O-Ring boss |
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Especially designed for open circuit |
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Fail Safe: Without control signal, the |
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‒ SAE O-Ring boss |
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applications with a need for reverse |
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motor is biased to maximum forward |
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‒ Split flange |
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functionality |
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speed |
A speed sensor is available |
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Five displacements allow the optimum |
Damped shifting from reverse to |
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selection of a hydraulic motor to fit your |
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forward |
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application |
Shaft options with dust seal protector |
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Fan Drives with reverse functionality |
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Reliability - uses existing and proven |
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Integrated system protection - anti- |
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Conveyers |
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technology of Danfoss L&K motors |
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cavitation and shock valve |
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Etc. |
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High capacity bearings to withstand |
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Installation and Packaging benefits |
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axial fan forces |
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Short and compact |
Complimentary to Danfoss Series 45 |
Comprehensive technical literature online |
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open circuit pumps with electronic |
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High efficiency - nine piston rotating |
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at powersolutions.danfoss.com |
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proportional control |
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groups with an 18 degree maximum |
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PLUS+1® micro controller with fan drive |
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angle |
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software available |
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Uses system pressure for shifting – no |
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This motor has the capability to be held |
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external pressure supply needed |
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at or near neutral for potential added |
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Integrated shifting valve enables |
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system power savings or faster heating |
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reversing – no external valves needed - |
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of the engine at start-up |
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less hoses - less losses - simple and |
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Variety of porting options allow for |
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clean installation |
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easier system configurations system |
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12 VDC and 24 VDC valves |
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configurations |
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© Danfoss | April 2016 |
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L1410616 | AI00000188en-US0202 | 1 |
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Data Sheet
Reverse Displacement Motor (RDM)
Technical Specifications
Parameter |
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Unit |
LM25 |
LM30 |
LM35 |
KM38 |
KM45 |
Displacement (maximum) |
cm3 |
25 |
30 |
35 |
38 |
45 |
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[in3] |
[1.50] |
[1.83] |
[2.14] |
[2.32] |
[2.75] |
Weight |
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kg [lb] |
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17.5 [38.6] |
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Theoretical torque |
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N·m/bar |
0.40 [244] |
0.48 [293] |
0.56 [347] |
0.60 [366] |
0.72 [439] |
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[lbf·in/1000 psi] |
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Output speed |
Rated |
min-1 (rpm) |
3400 |
3500 |
3600 |
3600 |
3500 |
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Max. |
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3950 |
4150 |
4300 |
4000 |
3900 |
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System pressure(1) |
Max. |
bar [psi] |
350 [5075] |
350 [5075] |
325 [4715] |
350 [5075] |
350 [5075] |
Case pressure |
Rated |
bar [psi] |
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0.5 [7] above outlet pressure, 2 [29] absolute pressure |
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Max. |
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2 [29] above outlet pressure, 6 [87] absolute pressure |
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Voltage |
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VDC |
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12, 24 |
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Current |
12 VDC |
mA |
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1500 |
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24 VDC |
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750 |
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Connector |
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- |
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DEUTSCH connector DT04-2P |
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(1) Refer to L and K Frame Variable Motors Technical Information 520L0627 for pressure definitions
Fan Drive Circuit
Microcontroller
(PLUS+1TM)
Reservoir |
Filter |
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Temperature |
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Engine Control |
Sensors |
T1 |
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Module (ECM) |
Diesel Engine |
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T2 |
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Variable Pump |
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(Series 45) |
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Reverse |
T3 |
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Displacement |
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Motor (RDM) |
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P108732 |
2 | © Danfoss | April 2016 |
L1410616 | AI00000188en-US0202 |
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