Series 20

Axial Piston Motors

Technical
Information

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Series 20 Axial Piston Motors

Technical Information
General Description
INTRODUCTION

Sauer-Danfoss a world leader in hydraulic power systems has developed a family of axial
piston motors.

DESCRIPTION

Sauer-Danfoss axial pistons fixed displacement motors are of swash plate design with
preset displacement suitable for hydrostatic transmissions with closed loop circuit.
The output speed is proportional to the motors input flow.
The output torque is proportional to the differential pressure applied to the main
pressure ports.
The direction of motor (output) shaft rotation depends on flow input to the main
pressure ports.
Sauer-Danfoss axial piston fixed displacement motors are well engineered and easy to
handle.
The full-length shaft with a highly efficient tapered roller bearing arrangement offers a
high loading capacity for external radial forces.
High case pressures can be achieved without leakage even at the lowest temperatures
by using suitable shaft seals.
Sauer-Danfoss axial piston units are designed for easy servicing. Complete dismantling
and reassembly can be carried out with standard hand tools, and all components or
sub-assemblies are replaceable.
Axial piston fixed displacement motors of the Sauer-Danfoss pattern are made by
licensed producers worldwide, providing consistent service and fully inter-changeable
parts.

TYPICAL MARKETS

Industrial
Mining
Transit Mixer
Utility Vehicles

1999 -2001, 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 its products 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: F000 234, F000 249, F000 150, F000 248

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Technical Information
Contents
CONTENTS

General description ...................................................................................................................................................... 2

Introduction ................................................................................................................................................................. 2
Description ................................................................................................................................................................... 2
Typical Markets ........................................................................................................................................................... 2
Sectional view ................................................................................................................................................................. 4
Axial piston fixed displacement motor .............................................................................................................. 4
System circuit description ......................................................................................................................................... 5
Pump and motor circuit description ................................................................................................................... 5
Motor circuit schematic ........................................................................................................................................... 5
Technical specification ................................................................................................................................................ 6
Technical parameters ................................................................................................................................................ 6
Design .............................................................................................................................................................................................. 6
Type of mounting ........................................................................................................................................................................ 6
Pipe connections ......................................................................................................................................................................... 6
Direction of rotation ................................................................................................................................................................... 6
Installation position .................................................................................................................................................................... 6
External drain fluid loss ............................................................................................................................................................. 6

Hydraulic parameters ............................................................................................................................................... 7

System pressure range, input p1 ............................................................................................................................................. 7
System pressure range, output p2 .......................................................................................................................................... 7
Case pressure ................................................................................................................................................................................ 7
Hydraulic fluid ............................................................................................................................................................................... 7
Hydraulic fluid temperature range ........................................................................................................................................ 7
Viscosity range .............................................................................................................................................................................. 7
Filtration .......................................................................................................................................................................................... 7
Shaft load ....................................................................................................................................................................................... 7
Technical data ............................................................................................................................................................................... 8
Determination of nominal motor size .................................................................................................................................. 8

Dimensions Frame size 033, 052, 070, 089 and 119 cm3 ........................................................................ 10
Outline drawing, configuration MS ................................................................................................................... 10
Outline drawing, basic model ............................................................................................................................. 14
Outline drawing, motor configuration AM 01000 ....................................................................................... 14
Outline drawing, motor configuration MR ..................................................................................................... 15
Circuit diagrams ....................................................................................................................................................... 16
Dimensions Frame size 166, 227 and 334 cm3 ............................................................................................ 18
Outline drawing, configuration MS ................................................................................................................... 18

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Series 20 Axial Piston Motors

Technical Information
Sectional View
AXIAL PISTON FIXED DISPLACEMENT MOTOR

P005 118E

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Series 20 Axial Piston Motors

Technical Information
System Circuit Description
PUMP AND MOTOR CIRCUIT DESCRIPTION
HEAT EXCHANGER BYPASS VALVE
RESERVOIR
VACUUM GAUGE

CONTROL
HANDLE

HEAT EXCHANGER
SERVO CONTROL CYLINDER

REVERSIBLE VARIABLE
DISPLACEMENT PUMP

SERVO
PRESSURE
RELIEF VALVES

PUMP SWASHPLATE

FIXED
DISPLACEMENT MOTOR

PURGE RELIEF VALVE

CHARGE PRESSURE
RELIEF VALVE
LOOP FLUSHING VALVE

INPUT SHAFT

MOTOR SWASHPLATE

SERVO CONTROL CYLINDER

WORKING LOOP (HIGH PRESSURE)

OUTPUT SHAFT

WORKING LOOP (LOW PRESSURE)

CONTROL FLUID

SUCTION LINE

CASE DRAIN FLUID

P000 027E

Above figure shows schematically the function of a hydrostatic transmission using an

axial piston variable displacement pump and a fixed displacement motor.
MOTOR CIRCUIT
SCHEMATIC

MA
L2

A
4
2

Ports:
A, B =

B
L1
M

Designation:
1
=
Fixed displacement motor
2
=
Purge relief valve
3
=
Shuttle valve
4
=
High pressure relief valve

MB
P000 034

L1, L2
MA
MB
M

=
=
=
=

Main pressure ports

(working loop)
Drain ports
Gauge port for port A
Gauge port for port B
Gauge port - charge pressure

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Series 20 Axial Piston Motors

Technical Information
Technical Specification
TECHNICAL PARAMETERS

Design
Axial piston motor with fixed displacement and swash plate design.
Type of mounting
SAE four bolt flanges.
Pipe connections
Main pressure ports: SAE split flange
Remaining ports:
SAE O-ring boss
Direction of rotation and flow
Clockwise or counterclockwise (viewing from the output shaft).
Direction of rotation

Port A

Port B

Clockwise (R)
Counterclockwise (L)

Output
Input

Input
Output

Installation position
Optional; motor housing must be always filled with hydraulic fluid.
External drain fluid loss
28

20

2
1
0

External drain fluid loss (l/min)

(US gal/min)

227

Typical values for 350 bar [5076 psi]

and 18 swashplate angle

24

334

166

16
119

12

089

070

4
0

052
033

1000

2000

3000

4000

Driveshaft speed n (min-1) (rpm)

P005 105E

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Series 20 Axial Piston Motors

Technical Information
Technical Specification
HYDRAULIC
PARAMETERS

System pressure range, input p1

Pressure on port A or B:
Max. operating pressure
Max. high pressure setting
1

p = 420 bar [6092 psi]

p = 460 bar1 [6672 psi]

only with POR-valve

System pressure range, output p2

Normal setting for configuration MS and MR: 11.0 - 12.5 bar [160 - 181 psi] above case
pressure.
Minimum: 8 bar, intermittent only
Case pressure
Max. rated pressure = 2.5 bar [36.3 psi]
Intermittent
= 5.0 bar [72.5 psi]
Hydraulic fluid
Refer to Sauer-Danfoss publication Hydraulic Fluids and Lubricants and Experience with Bio
Fluids for biodegradable hydraulic fluids.
Hydraulic fluid temperature range
min = - 40 C [- 40 F]
max = 95 C [203 F]
Viscosity range
min = 7 mm2/s [49 SUS*]
max = 1000 mm2/s [4630 SUS*] (intermittent cold start)
Recommended viscosity range: 12 - 60 mm2/s [66 - 278 SUS*]
*SUS (Saybolt Universal Second)

Filtration
Required cleanliness level: ISO 4406-1999 Code 22/18/13 or better. Refer to Sauer-Danfoss
publication Hydraulic Fluids and Lubricants and Design Guideline for Hydraulic Fluid
Cleanliness.
Shaft load
The pump will accept radial and axial loads on its shaft, the maximum capacity being
determined by direction and point of application of the load. Please contact your
Sauer-Danfoss representative.

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Series 20 Axial Piston Motors

Technical Information
Technical Specification
HYDRAULIC
PARAMETERS
(continued)

Technical data
Dimension

Frame size
033
052
070
089
119
166
227
cm3
33.3
51.6
69.8
89.0 118.7 165.8
227.3
Max. displacement
[in3]
[2.03] [3.15] [4.26] [5.43] [7.24] [10.12] [13.87]
1
Rated speed
min-1 (rpm)
3800
3500
3200 2900 2700
2400
2100
Nm/bar
0.53
0.82
1.11
1.42
1.89
2.64
3.62
Theoretical torque
[in lb/1000 psi] [323] [500] [677] [867] [1153] [1611] [2209]
Mass moment of inertia kg m2 10 -3
4.34
8.14
12.34 17.77 29.11 50.19
86.80
of rotating group
[lbfft2 10 -3] [103.0] [193.2] [292.8] [421.7] [690.8] [1191.0] [2059.8]
1

334
333.7
[20.36]
1900
5.31
[3240]
161.40
[3830.0]

for higher speeds contact your Sauer-Danfoss representative

Determination of nominal motor size

Unit:

Metric System:

Inch System

Input flow

Vg n
Qe =
1000 v

l/min

Vg n
Qe =
231 v

[gpm]

Output torque

Vg p m
Me =
20

Nm

Vg p m
Me =
2

[lbfin]

Output power

Qe p t
Pe =
600

kW

Vg n p t
Pe =
[hp]
396 000

Speed

Qe 1000 v
n =
Vg

min-1

Qe 231 v
n =
(rpm)
Vg

Efficiency characteristic curves available on request.

Vg = Moror displacement per revolution
n = Motor speed
p = Hydraulic pressure differential
p = pHD - pND
v = Moror volumetric efficiency
m = Moror mechanical efficiency
t = Moror total efficiency
pHD = High pressure
pND = Low pressure

cm3
min-1
bar

[in3]
(rpm)
[psid]

bar
bar

[psid]
[psid]

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Technical Information
Notes

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Series 20 Axial Piston Motors

Technical Information
Dimensions Frame Size 033, 052, 070, 089 and 119 cm3
OUTLINE DRAWING,
CONFIGURATION MS

Port "L1": Case drain port

(use highest port as outlet)

E
J
K

Coupling may not protrude

beyond L mm maximum
lenght of full spline

Approx. centre
of gravity
Purge relief valve

52.4

Shuttle valve
(both sides)

N -0.05

26.2

M
Shaft spline data: *
Pitch
=S
Pressure angle = 30
Number of teeth = T
Pitch
=U

Port "A"
Port "L2":
Case drain port

12.450.24
D
C
B

A
P000 567E

View Y

Flange design
2/070

Gauge port "MB"

Gauge port "MA"

Gauge port "M"

charge pressure

Port "B"

Port "A"

High pressure relief

valve for port "A"

High pressure relief

valve for port "B"

V
Port "A"

V
Port "B"
219
P005 101E

* Shaft spline data: spline shaft with involute spline, according to SAE handbook, 1963,
class 1, fillet root side fit.
Frame size

Port A and B

033

SAE flange, size 1

SAE split flange boss
5000 psi
4 threads
3/8-16 UNC-2B
18 deep

052
070
089
119

10

Port L1 and L2
7/8-14 UNF-2B
SAE straight thread
O-ring boss

Port MA and MB

7/16-20 UNF-2B
SAE straight thread
O-ring boss

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Series 20 Axial Piston Motors

Technical Information
Dimensions Frame Size 033, 052, 070, 089 and 119 cm3
OUTLINE DRAWING,
CONFIGURATION MS
(continued)

View X (for SMF 2/033 - 2/052 only)

Rotation
L

156

124

45

16

Approx. centre
of gravity

15

+ 0.8
0.3

146
190
P005 102E

View X (for SMF 2/070 only)

45

Rotation
L

193.5

168

142.8

1
62

Approx. centre
of gravity

+ 0.8

15 0.3

168
P005 119E

11

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Technical Information
Dimensions Frame Size 033, 052, 070, 089 and 119 cm3
OUTLINE DRAWING,
CONFIGURATION MS
(continued)

45

View X (for SMF 2/089 only)

Rotation
L

156

168

16
2

Approx. centre
of gravity

15

+ 0,8
0,3

168
P005 120

View X (for SMF 2/119 only)

170

203

45

Rotation

2
29

Approx. centre
of gravity

21.3

+ 0.8
0.3

213
P005 103E

12

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Series 20 Axial Piston Motors

Technical Information
Dimensions Frame Size 033, 052, 070, 089 and 119 cm3
OUTLINE DRAWING, CONFIGURATION MS (continued)
Dimensions
Frame
size
033
052
070
089
119
Frame
size
033
052
070
089
119

mm
mm
A
B
[in]
[in]
340
252
[13.386]
[9.921]
358
270
[14.094] [10.630]
378
290
[14.882] [11.417]
395
307
[15.551] [12.087]
442
354
[17.402] [13.937]
mm
mm
N
O
[in]
[in]
127
84
[5.000]
[3.307]
127
84
[5.000]
[3.307]
127
84
[5.000]
[3.307]
127
98
[5.000]
[3.858]
152.4
98
[6.000]
[3.858]

mm
mm
mm
C
D
E
[in]
[in]
[in]
214
156
89
[8.425]
[6.142]
[3.504]
235
160
96
[9.252]
[6.299]
[3.780]
255
165
108
[10.039]
[6.496]
[4.252]
273
170
118
[10.748]
[6.693]
[4.646]
295
175
125
[11.614]
[6.890]
[4.921]
mm
mm
mm
P
R
S
[in]
[in]
[in]
34.50 -0.17
8.5
33.338
[1.358 -0.0067] [0.335]
[1.313]
34.50 -0.17
8.5
33.338
[1.358 -0.0067] [0.335]
[1.313]
34.50 -0.17
8.5
33.338
[1.358 -0.0067] [0.335]
[1.313]
37.68 -0.17
8.5
36.513
[1.483 -0.0067] [0.335]
[1.438]
44.03 -0.17
11.8
42.863
[1.733 -0.0067] [0.465]
[1.688]

mm
[in]
70.6
[2.780]
76
[2.992]
86.5
[3.406]
96.0
[3.780]
98.2
[3.866]
mm
T
[in]
21
[0.827]
21
[0.827]
21
[0.827]
23
[0.906]
27
[1.063]
F

mm
[in]
82
[3.228]
88
[3.465]
98
[3.858]
107
[4.213]
109
[4.291]
mm
U
[in]
G

16/32
16/32
16/32
16/32
16/32

mm
[in]
140
[5.512]
154
[6.063]
161
[6.339]
181
[7.126]
200
[7.874]
mm
V
[in]
81
[3.189]
85.8
[3.378]
85.8
[3.378]
95.2
[3.748]
106.5
[4.193]

mm
[in]
16
[0.630]
16
[0.630]
16
[0.630]
18
[0.709]
25
[0.984]
mm
W
[in]
92
[3.622]
96
[3.780]
101
[3.976]
114
[4.488]
J

mm
mm
L
[in]
[in]
56
48
[2.205]
[1.890]
56
48
[2.205]
[1.890]
56
48
[2.205]
[1.890]
56
48
[2.205]
[1.890]
75
67
[2.953]
[2.638]
Diameter for mm
shaft coupling [in]
31.75 +0.062
[1.250 +0.0024]
31.75 +0.062
[1.250 +0.0024]
31.75 +0.062
[1.250 +0.0024]
34.95 +0.062
[1.376 +0.0024]
41.28 +0.062
[1.625 +0.0024]
K

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mm
[in]
28.4
[1.118]
28.4
[1.118]
28.4
[1.118]
28.4
[1.118]
38.4
[1.512]
kg
Weight
[lb]
30
[66]
35
[77]
40
[88]
47
[104]
70
[154]
M

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Series 20 Axial Piston Motors

Technical Information
Dimensions Frame Size 033, 052, 070, 089 and 119 cm3
OUTLINE DRAWING,
BASIC MODEL

A
D
Return from purge relief
valve to motor case R3/4

P000 568E

Dimensions
Frame size
033
052
070
089
119

A mm [in]
252 [9.921]
270 [10.630]
290 [11.417]
307 [12.087]
354 [13.937]

B mm [in]
25 [0.984]
32 [1.260]
30 [1.181]
44 [1.732]
37 [1.457]

C mm [in]
11 [0.433]
9 [0.354]
12 [0.472]
6 [0.236]
10 [0.394]

D mm [in]

2 [0.079]

Weight kg [lb]
24 [53]
29 [64]
34 [75]
41 [90]
64 [141]

For further dimensions see previous pages.

A

OUTLINE DRAWING,
MOTOR CONFIGURATION
AM 01000

1.5

B
12

110

25

Return from purge

relief valve to motor
case 7/8 - 14 UNF - 2B

100

P000 569E

Dimensions
Frame size
033
052
070
089
119
1

A mm [in]
277 [10.905]
295 [11.614]
315 [12.402]
332 [13.071]
379 [14.921]

Weight 1 kg [lb]
26 [57]
31 [68]
36 [79]
43 [95]
66 [146]

Light weight and short options available on request

For further dimensions see previous pages.

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Series 20 Axial Piston Motors

Technical Information
Dimensions Frame Size 033, 052, 070, 089 and 119 cm3
OUTLINE DRAWING, MOTOR CONFIGURATION MR
B
Purge relief valve
Shuttle valve
(both sides)

Gauge port "MB"

Gauge port "MA"

Port "B"

High pressure relief

valve for port "A"

High pressure relief

valve for port "B"

Bypass - handle
Partial View A-A

Bypass valve
opened

9.4 0.25

Port "A"

12

Gauge port "M"

charge pressure

90

19.05

3 x 6.5
Bypass valve
closed

25.4
41.28
50.8
58.55
90

P005 104E

Dimensions
Frame size
033
052
070
089
119

mm
A
[in]
388
[15.276]
406
[15.984]
426
[16.772]
443
[17.441]
490
[19.291]

mm
B
[in]
353
[13.898]
371
[14.606]
391
[15.394]
408
[16.063]
455
[17.913]

Weight kg
[lb]
32
[71]
37
[82]
42
[93]
49
[108]
72
[159]

Port MA and MB

Port M

7/16-20 UNF-2B
SAE straight thread O-ring boss

For further dimensions see previous pages.

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Series 20 Axial Piston Motors

Technical Information
Dimensions Frame Size 033, 052, 070, 089 and 119 cm3
CIRCUIT DIADRAMS

Configuration MR
MA
L2

4
5

2
3

B
L1
M

MB

P000 035

Basic model and motor configuration AM 01000

L2

A
Return from purge relief
valve to motor case

Designation:
1 = Fixed displacement motor
2 = Purge relief valve
3 = Shuttle valve
4 = High pressure relief valve
5 = Bypass valve
Ports:
A,B =

B
L1
P000 038E

16

L1, L2
MA
MB
M

=
=
=
=

Main pressure ports

(working loop)
Drain ports
Gauge port for port A
Gauge port for port B
Gauge port - charge pressure

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Series 20 Axial Piston Motors

Technical Information
Notes

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Series 20 Axial Piston Motors

Technical Information
Dimensions Frame Size 166, 227 and 334 cm3
OUTLINE DRAWING, CONFIGURATION MS
E

Port "L1": Case drain port

(use highest port as outlet)

Purge relief valve

Approx. centre
of gravity

77

Coupling may not protrude

beyond L mm maximum
lenght of full spline

Y
79.4

Shuttle valve
(both sides)

N -0.05

36.5

M
Port "A"
12.450.24

Port "L2":
Case drain port

D
C
Shaft spline data: *
Pitch
Pressure angle
Number of teeth
Pitch

=S
= 30
=T
=U

B
A
P005 100E-1

View Y

View X
CC

Gauge port "MA"

Gauge port "MB"

Gauge port "M"

charge pressure

Port "A"

45

Rotation
R
Y

Port "B"

AA

High pressure relief

valve for port "A"

High pressure relief

valve for port "B"
V
Port "A"

V
Port "B"

Approx. centre
of gravity
BB
P005 100E-2

* Shaft spline data: spline shaft with involute spline, according to SAE handbook, 1963,
class 1, fillet root side fit.

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Series 20 Axial Piston Motors

Technical Information
Dimensions Frame Size 166, 227 and 334 cm3
OUTLINE DRAWING, CONFIGURATION MS (continued)
Dimensions
Frame size
166
227
334
Frame size
166
227
334
Frame size
166
227
334

mm
A
[in]
467
[18.740]
498
[19.606]
537
[21.142]
mm
M
[in]
38.4
[1.512]
38.4
[1.512]
46.2
[1.819]
mm
W
[in]
148
[5.827]
156
[6.142]
176
[6.929]

mm
B
[in]
388
[15.276]
410
[16.142]
449
[17.677]
mm
N
[in]
165.1
[6.500]
165.1
[6.500]
177.8
[7.000]
mm
X
[in]
145
[5.709]
160
[6.299]
174
[6.850]

mm
C
[in]
331
[13.031]
346
[13.622]
389
[15.315]
mm
O
[in]
98
[3.858]
110
[4.331]
114
[4.488]
mm
Y
[in]
254
[10.000]
265
[10.433]
298
[11.732]

mm
D
[in]
219
[8.622]
228.5
[8.996]
278
[10.945]
mm
P
[in]
44.03 - 0.17
[1.733 - 0.0067]
44.03 - 0.17
[1.733 - 0.0067]
64.66 - 0.16
[2.546 - 0.0063]
mm
Z
[in]
285
[11.220]
265
[10.433]
298
[11.732]

Frame size
166

227
334

mm
[in]
136
[5.354]
139.7
[5.500]
154
[6.063]
mm
R
[in]
11.80
[0.465]
11.80
[0.465]
14.35
[0.565]
mm
AA
[in]
317.5
[12.500]
317.5
[12.500]
350.0
[13.780]
E

Port A and B
SAE flange, size 1 1/2
SAE split flange boss
6000 psi
4 threads
5/8 -11 UNC - 2B
35 deep

mm
[in]
122.2
[4.811]
134.9
[5.311]
143.5
[5.650]
mm
S
[in]
42.863
[1.688]
42.863
[1.688]
63.500
[2.500]
mm
BB
[in]
20.6 0.4
[0.811 0.0157]
20.6 0.4
[0.811 0.0157]
0.5
27.0 +- 0.1
+ 0.0197
[1.063 - 0.0039 ]
F

mm
[in]
136
[5.354]
152
[5.984]
161
[6.339]
mm
T
[in]
27
[1.063]
27
[1.063]
40
[1.575]
mm
CC
[in]
6
[0.236]
13
[0.512]
18
[0.709]

mm
[in]
229
[9.016]
264
[10.394]
292
[11.496]

Port L1 and L2

1 5/16 -12 UN - 2B
SAE straight thread
O-ring boss

U
16/32
16/32
16/32
Diameter for
shaft coupling
41.28 + 0.062
[1.625 + 0.0024]
41.28 + 0.062
[1.625 + 0.0024]
61.93 + 0.074
[2.438 + 0.0029]

Port MA and MB

1 7/8 -12 UN - 2B
SAE straight thread
O-ring boss

Port M

7/16-20 UNF-2B
SAE straight thread
O-ring boss

19

DKMH.PN.340.C1.02 520L0516

Series20_Axial Piston Motors_TI_012002.indd

18-19

mm
[in]
24
[0.945]
27
[1.063]
38
[1.496]
mm
V
[in]
130.0
[5.118]
143.7
[5.657]
158.7
[6.248]
kg
Weight
[lb]
124
[273]
152
[335]
197
[434]
J

11.2.2002, 12:24

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Series20_Axial Piston Motors_TI_012002.indd

20

11.2.2002, 12:24