Sauer MF motor

Sauer MF motor

Product introduction:

Model: Sauer MF motor

Closed circuit

Series 20

Size: 20, 21, 22, 23, 24, 25, 26, 27

  • Sauer MF motor

     

    Sauer MF motor

    Hydraulic Sauer-Sundstrand axial piston motor MF20, MF21, MF22, MF23, MF24, MF25, MF26, MF27

    Description

     

    Closed circuit

    Series 20

    Size: 20, 21, 22, 23, 24, 25, 26, 27

    Nominal pressure 210 bars, Maximum pressure 350 bars.

     

    The Sauer MF axial piston variable displacement motors, Series 20, are of swash plate construction with variable flow capability suitable for hydrostatic transmissions with closed circuit. The flow rate is proportional to the motors driven speed displacement, which, in turn, is determined by the swash plate angle. The latter is infinitely adjustable between zero and maximum displacement. Flow direction is reserved by titling the swash plate to the opposite side of the neutral or zero displacement position. These units and parts are fit, form and function replacements for Sauer-Sundstrand series 20 components.

     

    – Suitable for a variety of applications

    – Multiple displacements and options available

    – 8 different frame sizes

    – Engineered to provide a long service life and reliability

    – Fixed displacement motor can be operated in either direction of rotation

    – Multiple drive shaft options and control options

    – Heavy duty bearings and shafts

    – Easily serviceable

    – Replacement parts also available

    – Direct replacements for Sauer-Sundstrand

    Features 

    The full-length shaft with a high efficient tapered roller bearing arrangement offers a high loading capacity for external radial forces. Additional motors can be built on. The hydro-mechanical servo displacement control maintains the selected swash plate position and hence motor displacement.

    Upon release of the control handle, the swash plate automatically returns to the null position and the flow become zero.

    High case pressures can be archived without leakage even at the lowest temperature by using suitable shaft seals. The servo valve arrangement offers the facility to incorporate function regulators and remote control system. Axial piston units are designed for easy servicing, complete dismantling and reassembly can be carried out standard hand tools, and all components or sub-assemblies are replaceable.

    Servo Displacement Control (Linear response)

    Regular by control handle on the servo valve, the swash plate can be infinitely varied in both direction with the help of the servo system.

    The motor displacement resulting from any control handle position can be established using figures (5a – 5c).

    The angle of the control handle for stroke initiation and for the final position of the stroke can vary from unit to unit within the range of the tolerance band.

     

    Technical Data 

    Table of values (theoretical values, without efficiency and tolerances; values rounded)

     

    Size

    Dimension

    Sauer-Sundstrand MF motor

    MF20

    MF21

    MF22

    MF23

    MF24

    MF25

    MF26

    MF27

    Max. displacement

    cm3

    33,3

    51,6

    69,8

    89,0

    118,7

    165,8

    227,3

    333,7

    Max. flow

    dm3min-1

    119,5

    159,9

    196,1

    230,5

    278,9

    348,1

    429,59

    557,2

    4

    6

    4

    1

    4

    8

    8

    Charge motor

    cm3

    12,3

    12,3

    18,03

    18,03

    18,8

    32,8

    32,8

    65,5

    Max. pressure

    MPa

    35

    Nominal pressure

    MPa

    21

    Max. pressure of control

    MPa

    3,5

    Charge pressure

    MPa

    0,8 – 2,0

    Max. pressure in case

    MPa

    0,25 continuous 0,5 intermittent

    Maximum speed +

    min-1

    3590

    3100

    2810

    2590

    2350

    2100

    1890

    1670

    Minimum speed

    min-1

    500

    Nominal speed

    min-1

    1500

    Kinematic viscosity range of working fluid

    – starting

    – operating

    – optimum

     

     

    mm2s-1

     

     

    1000

    12 – 600

    25 – 35

    Kind of working fluid

     

    mineral oil

    Operating temperature

    oC

    – 40 to + 50

    Max. temperature of working fluid in tank

    oC

    80

    Purity of working fluid

    µm

    10

    Maximum swash plate angle

    o

    ± 18 o

    Weight

    kg

    30

    35

    40

    47

    70

    124

    152

    197

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