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.
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 |
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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 |