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Sauer Danfoss MF / SMF Axial Piston Hydraulic Motor


Axial Piston Sauer MF Motor
Closed circuit
Series 20
Size: MF20, MF21, MF22, MF23, MF24, MF 25, MF 26, MF 27
Nominal pressure 210 bars, Maximum pressure 350 bars.

A4VSO piston pump Rexroth A4VSO pump

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 of Sauer MF motor
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 becomes 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 directions with the help of the servo system.
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 Sauer MF motor
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

Maximum displacement

cm3

33,3

51,6

69,8

89,0

118,7

165,8

227,3

333,7

Maximum flow

dm3 min-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

Maximum 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

Maximum speed

min-1

500

Nominal speed

min-1

1500

Kinematic viscosity range of working fluid
- starting
- operating
- optimum

 
 
Mm 2s-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

Max. swash plate angle

o

± 18 o

Dry weight

kg

30

35

40

47

70

124

152

197


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