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Series 51 Series 51-1 Bent Axis Variable Displacement Motors Technical Information

Series 51 and 51-1 Bent Axis Variable Displacement Motors Technical Information General Description
General Description Series 51 and 51-1 variable displacement motors are bent axis design units, incorporating spherical pistons. These motors are designed primarily to be combined with other products in closedcircuit systems to transfer and control hydraulic power. Series 51 and 51-1 motors have a large maximum / minimum displacement ratio (5:1) and high output speed capabilities. SAE, cartridge, and DIN flange configurations are available. A complete family of controls and regulators is available to fulfill the requirements of a wide range of applications. Motors normally start at maximumdisplacement. This provides maximum starting torque for high acceleration. The controls may utilize internally supplied servo pressure. They may be overridden by a pressure compensator which functions when the motor is operating in motor and pump modes. A defeat option is available to disable the pressure compensator override when the motor is running in pump mode. The pressure compensator optionfeatures a low pressure rise (short ramp) to ensure optimal power utilization throughout the entire displacement range of the motor. The pressure compensator is also available as a stand-alone regulator.

• The series 51 and 51-1 motors – Advanced technology today • The most technically advanced hydraulic units in the industry • SAE, cartridge, and DIN flange motors • Cartridge motors designed fordirect installation in compact planetary drives • Large displacement ratio (5:1) • Complete family of control systems • Proven reliability and performance • Optimum product configurations • Compact, lightweight

© 2009, Sauer-Danfoss Sauer-Danfoss can accept no responsibility for possible errors in catalogues, brochures and other printed material. Sauer -Danfoss reserves the right to alter itsproducts without prior notice. This also applies to products already ordered provided that such alterations can be made without subsequent changes being necessary in specifications already agreed. All trademarks in this material are properties of the respective companies. Sauer-Danfoss and the Sauer-Danfoss logotype are trademarks of the Sauer-Danfoss Group. All rights reserved. Front page:F300550, F300542, F300541, F300549, P001196-2

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520L0440 • Rev AD • Dec 2009

Series 51 and 51-1 Bent Axis Variable Displacement Motors Technical Information Contents
Contents
General Description ........................................................................................................................2 SectionalView..................................................................................................................................6 Series 51-1, Two-Position Control...........................................................................................................................6 Series 51, Proportional Control ...............................................................................................................................7 SystemCircuit Description..............................................................................................................8 Pictorial Diagram ..........................................................................................................................................................8 System CircuitDiagram..............................................................................................................................................8 Technical Specifications ................................................................................................................10 General specifications ............................................................................................................................................. 10 Specific Data...