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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 motor’s 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: F005 103, F000 249, F000 150, F000 248

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Series 20 – Axial Piston Motors

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 070 and 089 cm3 .........................................................................................................9
Outline drawing, configuration MS ...................................................................................................................... 9
Outline drawing, basic model ............................................................................................................................. 11
Outline drawing, motor configuration AM 01000 ....................................................................................... 11
Outline drawing, motor configuration MR ..................................................................................................... 12
Circuit diagrams ....................................................................................................................................................... 13
Dimensions – Frame size 227 and 334 cm3 ...................................................................................................... 14
Outline drawing, configuration MS ................................................................................................................... 14

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Series 20 – Axial Piston Motors

Technical Information
Sectional View

AXIAL PISTON FIXED DISPLACEMENT MOTOR

High pressure
relief valves Cylinder block
(adjustable) assembly Shaft seal
Purge
relief valve

Output
shaft

Valve block

Shuttle valve Swashplate

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

CONTROL VACUUM GAUGE

HANDLE
HEAT EXCHANGER

REVERSIBLE VARIABLE SERVO CONTROL CYLINDER

DISPLACEMENT PUMP

PUMP SWASHPLATE SERVO PURGE RELIEF VALVE FIXED

PRESSURE DISPLACEMENT MOTOR
RELIEF VALVES

CHARGE PRESSURE
RELIEF VALVE

INPUT SHAFT LOOP FLUSHING VALVE

OUTPUT SHAFT

SERVO CONTROL CYLINDER MOTOR SWASHPLATE

WORKING LOOP (HIGH PRESSURE) 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.

MA
MOTOR CIRCUIT Designation:
SCHEMATIC L2 1 1 = Fixed displacement motor
A 2 = Purge relief valve
3 = Shuttle valve
4
4 = High pressure relief valve
2
3
Ports:
4
A, B = Main pressure ports
(working loop)
B
L1
L1, L2 = Drain ports
MA = Gauge port for port A
M MB MB = Gauge port for port B
P000 034
M = 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) Output Input
Counterclockwise (L) Input Output

Installation position
Optional; motor housing must be always filled with hydraulic fluid.

External drain fluid loss

28
7 334 Typical values for 350 bar [5076 psi]
and 18˚ swashplate angle
24
6 227
20
5
(US gal/min)

External drain fluid loss (l/min)

16
4

12
3
089
2 8
070

1 4

0 0
0 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 System pressure range, input p1

PARAMETERS Pressure on port A or B:

Max. operating pressure ∆p = 420 bar [6092 psi]

Max. high pressure setting ∆p = 460 bar1 [6672 psi]
1
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

ϑmin = - 40 °C [- 40 °F]
ϑmax = 95 °C [203 °F]

Viscosity range
νmin = 7 mm2/s [49 SUS*]
νmax = 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 Technical data
(continued) Dimension Frame size
070 089 227 334
cm3 69.8 89.0 227.3 333.7
Max. displacement
[in3] [4.26] [5.43] [13.87] [20.36]
Rated speed 1
min-1 (rpm) 3200 2900 2100 1900
Nm/bar 1.11 1.42 3.62 5.31
Theoretical torque
[in lb/1000 psi] [677] [867] [2209] [3240]
Mass moment of inertia kg m2 • 10 -3 12.34 17.77 86.80 161.40
of rotating group [lbf•ft2 • 10 -3] [292.8] [421.7] [2059.8] [3830.0]
1
for higher speeds contact your Sauer-Danfoss representative

Determination of nominal motor size

Unit: Metric System: Inch System

Vg • n Vg • n
Input flow Qe =  l/min Qe =  [gpm]
1000 • ηv 231 • ηv

Vg • ∆p • ηm Vg • ∆p • ηm
Output torque Me =  Nm Me =  [lbf•in]
20 • π 2•π

Qe • ∆p • ηt Vg • n • ∆p • ηt
Output power Pe =  kW Pe =  [hp]
600 396 000

Qe • 1000 • ηv Qe • 231 • ηv
Speed n =  min-1 n =  (rpm)
Vg Vg

Efficiency characteristic curves available on request.

Vg = Moror displacement per revolution cm3 [in3]

n = Motor speed min-1 (rpm)
∆p = Hydraulic pressure differential bar [psid]
∆p = pHD - pND
ηv = Moror volumetric efficiency
ηm = Moror mechanical efficiency
ηt = Moror total efficiency
pHD = High pressure bar [psid]
pND = Low pressure bar [psid]

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Series 20 – Axial Piston Motors

Technical Information
Dimensions – Frame Size 070 and 089 cm3

OUTLINE DRAWING, E
Port "L1": Case drain port
(use highest port as outlet)
CONFIGURATION MS J
K
Coupling may not protrude Approx. centre
beyond L mm maximum of gravity
lenght of full spline
Purge relief valve

26.2

F
ØR
Ø N -0.05
Y
X

52.4
ØP
ØO
Shuttle valve

ØH
(both sides)

G
M
Port "A"
Port "L2":
Shaft spline data: * 12.45±0.24
Case drain port
Pitch Ø =S D
Pressure angle = 30˚
Number of teeth = T C
Pitch =U B
A
P000 567E

View Y
Flange design
2/070

Gauge port "MA" Gauge port "MB"

Gauge port "M"

charge pressure

Port "A" Port "B"

High pressure relief High pressure relief

valve for port "B" valve for port "A"

V V
Port "A" 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 Port L1 and L2 Port MA and MB Port M

SAE flange, size 1
070 SAE split flange boss 7/8-14 UNF-2B 7/16-20 UNF-2B
5000 psi SAE straight thread SAE straight thread
4 threads O-ring boss O-ring boss
089 3/8-16 UNC-2B
18 deep

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Series 20 – Axial Piston Motors

Technical Information
Dimensions – Frame Size 070 and 089 cm3

OUTLINE DRAWING, View X (for SMF 2/070 only)

CONFIGURATION MS
(continued)

Rotation

W
45˚ L R

Ø193.5
142.8

168
Ø1
62

Approx. centre
of gravity

+ 0.8
Ø15 – 0.3

168

P005 119E

View X (for SMF 2/089 only)

W
45˚

Rotation

L R
156

168

Ø16
2

Approx. centre
of gravity

+ 0,8
Ø15 – 0,3

168
P005 120

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Series 20 – Axial Piston Motors

Technical Information
Dimensions – Frame Size 070 and 089 cm3

OUTLINE DRAWING, CONFIGURATION MS (continued)

Dimensions
Frame mm mm mm mm mm mm mm mm mm mm mm mm
A B C D E F G ∅H J K L M
size [in] [in] [in] [in] [in] [in] [in] [in] [in] [in] [in] [in]
378 290 255 165 108 86.5 98 161 16 56 48 28.4
070
[14.882] [11.417] [10.039] [6.496] [4.252] [3.406] [3.858] [6.339] [0.630] [2.205] [1.890] [1.118]
395 307 273 170 118 96.0 107 181 18 56 48 28.4
089
[15.551] [12.087] [10.748] [6.693] [4.646] [3.780] [4.213] [7.126] [0.709] [2.205] [1.890] [1.118]
Frame mm mm mm mm mm mm mm mm mm Diameter for mm kg
∅N ∅O ∅P ∅R ∅S T U V W Weight
size [in] [in] [in] [in] [in] [in] [in] [in] [in] shaft coupling [in] [lb]
127 84 34.50 -0.17 8.5 33.338 21 85.8 101 31.75 +0.062 40
070 16/32
[5.000] [3.307] [1.358 -0.0067] [0.335] [1.313] [0.827] [3.378] [3.976] [1.250 +0.0024] [88]
127 98 37.68 -0.17 8.5 36.513 23 95.2 114 34.95 +0.062 47
089 16/32
[5.000] [3.858] [1.483 -0.0067] [0.335] [1.438] [0.906] [3.748] [4.488] [1.376 +0.0024] [104]

A
OUTLINE DRAWING, D
BASIC MODEL Return from purge relief
valve to motor case R3/4

A C B

B
P000 568E

Dimensions
Frame size A mm [in] B mm [in] C mm [in] D mm [in] Weight kg [lb]
070 290 [11.417] 30 [1.181] 12 [0.472] 2 [0.079] 34 [75]
089 307 [12.087] 44 [1.732] 6 [0.236] 41 [90]
For further dimensions see previous pages.

A
OUTLINE DRAWING, 1.5
MOTOR CONFIGURATION Return from purge
AM 01000 relief valve to motor
case 7/8 - 14 UNF - 2B

A B
25
110

12

100
P000 569E

Dimensions
Frame size A mm [in] Weight 1 kg [lb]
070 315 [12.402] 36 [79]
089 332 [13.071] 43 [95]
1
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 070 and 089 cm3

OUTLINE DRAWING, MOTOR CONFIGURATION MR

B

Purge relief valve

Gauge port "MB" Shuttle valve

Gauge port "MA" (both sides)
Gauge port "M"
charge pressure

12
Port "A" Port "B"

High pressure relief

High pressure relief valve for port "A"

9.4 ± 0.25
valve for port "B"

Bypass - handle
A
Partial View A-A Bypass valve
opened A
˚
90

3 x Ø 6.5
19.05

Bypass valve
closed

25.4
41.28
50.8
58.55
90
˚

P005 104E

Dimensions
mm mm Weight kg
Frame size A B Port MA and MB Port M
[in] [in] [lb]
426 391 42
070
[16.772] [15.394] [93] 7/16-20 UNF-2B
443 408 49 SAE straight thread O-ring boss
089
[17.441] [16.063] [108]

For further dimensions see previous pages.

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Series 20 – Axial Piston Motors

Technical Information
Dimensions – Frame Size 070 and 089 cm3

CIRCUIT DIADRAMS Configuration MR

MA

L2
1

5 2
3

B
L1

M MB
P000 035

Basic model and motor configuration AM 01000

L2 Designation:
1

A 1 = Fixed displacement motor

Return from purge relief 2 = Purge relief valve
valve to motor case 3 = Shuttle valve
4 = High pressure relief valve
5 = Bypass valve

Ports:
A,B = Main pressure ports
(working loop)
L1, L2 = Drain ports
B
MA = Gauge port for port A
L1 MB = Gauge port for port B
P000 038E M = Gauge port - charge pressure

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Series 20 – Axial Piston Motors

Technical Information
Dimensions – Frame Size 227 and 334 cm3

OUTLINE DRAWING, CONFIGURATION MS

E
Port "L1": Case drain port
J (use highest port as outlet)

Approx. centre Purge relief valve

77
of gravity
Coupling may not protrude
beyond L mm maximum
lenght of full spline

36.5

F
ØR

Y
Ø N -0.05

ØO

ØP

79.4
X
Shuttle valve

ØH
(both sides)
F

G
M

Port "A"
12.45±0.24
Port "L2":
D Case drain port

C
Shaft spline data: *
Pitch Ø =S B
Pressure angle = 30˚
Number of teeth =T
Pitch =U A
P005 100E-1

View Y View X

CC
Gauge port "MA" Gauge port "MB"

Rotation
45˚

W
Gauge port "M"

X
charge pressure L R

Port "A" Port "B"

Y

AA

High pressure relief High pressure relief Approx. centre

valve for port "B" valve for port "A" of gravity

V V BB
Port "A" Port "B"
Z
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 227 and 334 cm3

OUTLINE DRAWING, CONFIGURATION MS (continued)

Dimensions
mm mm mm mm mm mm mm mm mm
Frame size A B C D E F G ∅H J
[in] [in] [in] [in] [in] [in] [in] [in] [in]
498 410 346 228.5 139.7 134.9 152 264 27
227
[19.606] [16.142] [13.622] [8.996] [5.500] [5.311] [5.984] [10.394] [1.063]
537 449 389 278 154 143.5 161 292 38
334
[21.142] [17.677] [15.315] [10.945] [6.063] [5.650] [6.339] [11.496] [1.496]
mm mm mm mm mm mm mm mm
Frame size M ∅N ∅O ∅P ∅R ∅S T U V
[in] [in] [in] [in] [in] [in] [in] [in]
38.4 165.1 110 44.03 - 0.17 11.80 42.863 27 143.7
227 16/32
[1.512] [6.500] [4.331] [1.733 - 0.0067] [0.465] [1.688] [1.063] [5.657]
46.2 177.8 114 64.66 - 0.16 14.35 63.500 40 158.7
334 16/32
[1.819] [7.000] [4.488] [2.546 - 0.0063] [0.565] [2.500] [1.575] [6.248]
mm mm mm mm mm mm mm Diameter for kg
Frame size W X Y Z AA BB CC Weight
[in] [in] [in] [in] [in] [in] [in] shaft coupling [lb]
156 160 265 265 317.5 20.6 ± 0.4 13 41.28 + 0.062 152
227
[6.142] [6.299] [10.433] [10.433] [12.500] [0.811 ± 0.0157] [0.512] [1.625 + 0.0024] [335]
176 174 298 298 350.0 27.0 +- 0.1
0.5
18 61.93 + 0.074 197
334
[6.929] [6.850] [11.732] [11.732] [13.780] [1.063 - 0.0039 ]
+ 0.0197
[0.709] [2.438 + 0.0029] [434]

Frame size Port A and B Port L1 and L2 Port MA and MB Port M

SAE flange, size 1 1/2
227 SAE split flange boss 1 7/8 -12 UN - 2B 7/16-20 UNF-2B
6000 psi SAE straight thread SAE straight thread
4 threads O-ring boss O-ring boss
334 5/8 -11 UNC - 2B
35 deep

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OUR PRODUCTS Sauer-Danfoss Hydraulic Power Systems

– Market Leaders Worldwide
Hydrostatic transmissions
Sauer-Danfoss is a comprehensive supplier providing complete
Hydraulic power steering systems to the global mobile market.
Electro-hydraulic power steering
Sauer-Danfoss serves markets such as agriculture, construction, road
Electric power steering building, material handling, municipal, forestry, turf care, and many
others.
Closed and open circuit axial piston
pumps and motors We offer our customers optimum solutions for their needs and
develop new products and systems in close cooperation and
Gear pumps and motors
partnership with them.
Bent axis motors
Sauer-Danfoss specializes in integrating a full range of system
Radial piston motors components to provide vehicle designers with the most advanced
total system design.
Orbital motors

Transit mixer drives Sauer-Danfoss provides comprehensive worldwide service for its
products through an extensive network of Authorized Service
Planetary compact gears Centers strategically located in all parts of the world.

Proportional valves

Directional spool valves

Cartridge valves

Hydraulic integrated circuits

Hydrostatic transaxles

Integrated systems
Sauer-Danfoss (US) Company
Fan drive systems 2800 East 13th Street
Ames, IA 50010, USA
Electrohydraulic controls Phone: +1 515 239-6000, Fax: +1 515 239 6618
Digital electronics and software
Sauer-Danfoss (Neumünster) GmbH & Co. OHG
Battery powered inverter Postfach 2460, D-24531 Neumünster
Krokamp 35, D-24539 Neumünster, Germany
Sensors Phone +49 4321 871-0, Fax: +49 4321 871 122

Sauer-Danfoss (Nordborg) A/S

DK-6430 Nordborg, Denmark
Phone: +45 7488 4444, Fax: +45 7488 4400

DKMH.PN.340.C1.02 520L0516 www.sauer-danfoss.com

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