Series 40
Axial Piston
Motors
Technical
Information
520L0636 • Rev FD • August 2010
2
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other printed material. Sauer -Danfoss reserves the right to alter its products without
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the Sauer-Danfoss S-icon, PLUS+1™, What really matters is inside® and Know-How in
Motion™ are trademarks of the Sauer-Danfoss Group.
Series 40 Axial Piston Motors
Technical Information
REVISIONS
Revisions
Table of Revisions
Date Page Changed Rev.
August 2010 last new back page FD
March 2010 various minor edits FC
November 2007 31 correction to maximum torque rating 15 and 19 tooth FB
April 2007 29 Revised dimensions for straight keyed shaft FA
September-2006 21-22 Corrections in model code examples F
September-2005 Major Revision E
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520L0636 • Rev FD • August 2010
Series 40 Axial Piston Motors
Technical Information
Contents
GENERAL DESCRIPTION
TECHNICAL
SPECIFICATIONS
OPERATING
PARAMETERS
SYSTEM DESIGN
PARAMETERS
PRODUCT CODING
FEATURES AND OPTIONS
Basic design ......................................................................................................................................................5
Key features ...................................................................................................................................................... 6
Cross sections ..................................................................................................................................................7
System circuit diagram .................................................................................................................................8
M46 motor schematic ..................................................................................................................................8
Overview ........................................................................................................................................................... 9
General ............................................................................................................................................................... 9
Features and options ....................................................................................................................................9
Specications ...................................................................................................................................................9
Operating parameters ................................................................................................................................10
Fluid specications ......................................................................................................................................10
Hydraulic unit life .........................................................................................................................................10
Performance ...................................................................................................................................................11
Bearing life and external shaft loading ...............................................................................................12
Fluids .................................................................................................................................................................14
Viscosity ...........................................................................................................................................................14
Temperature ...................................................................................................................................................14
Case pressure .................................................................................................................................................14
Pressure ratings .............................................................................................................................................15
Speed ratings .................................................................................................................................................16
Sizing equations ...........................................................................................................................................17
Flow ........................................................................................................................................................17
Speed .....................................................................................................................................................17
Torque....................................................................................................................................................17
Power .....................................................................................................................................................17
Variables ...............................................................................................................................................17
Filtration...........................................................................................................................................................18
Bypass valve ...................................................................................................................................................18
Loop ushing valve......................................................................................................................................19
Redundant braking system requirement ............................................................................................20
Reservoir ..........................................................................................................................................................20
Overpressure protection ...........................................................................................................................20
Revised model code ....................................................................................................................................21
Name plate .....................................................................................................................................................21
Model code modules ..................................................................................................................................21
Fixed motor .........................................................................................................................................21
Variable motor ....................................................................................................................................22
Displacement limiters .................................................................................................................................23
Displacement limiter M35 MV .................................................................................................................23
Displacement limiter M46 MV .................................................................................................................23
Speed sensor option ...................................................................................................................................24
Pulse pickup and connector .....................................................................................................................25
520L0636 • Rev FD • August 2010
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Series 40 Axial Piston Motors
Technical Information
Contents
INSTALLATION
DRAWINGS
SCHEMATICS
CONTROL OPTIONS
SHAFT OPTIONS
Cross-section of speed sensor on cylinder kit ...................................................................................25
Shaft options ..................................................................................................................................................26
Through-shaft options ...............................................................................................................................26
M25 MF ............................................................................................................................................................27
M35/44 MF ......................................................................................................................................................28
M35/44 MV .....................................................................................................................................................30
M46 MV ............................................................................................................................................................31
Direct displacement control (DDC) ........................................................................................................32
Two-position hydraulic control ...............................................................................................................33
M25 MF: axial ports, twin ports, loop ushing, speed sensor ........................................................34
M25 MF: mounting ange, ........................................................................................................................35
M35/M44 MF: mounting ange...............................................................................................................35
M35/M44 MF: axial ports, twin ports, loop ushing, speed sensor .............................................36
M35/M44 MF: side ports, through shaft ...............................................................................................37
M35/M44 MV: twin ports ...........................................................................................................................38
M35/M44 MV: mounting ange, trunnion control............................................................................39
M46 MV: side ports, loop ushing ...........................................................................................................40
M46 MV: axial ports, loop ushing ..........................................................................................................41
M46 MV: side ports, thru shaft twin ports, loop ushing ................................................................42
M46 MV: mounting ange .........................................................................................................................43
M46 MV: control ports ................................................................................................................................44
M25/M35/M44 xed motor schematics (no loop ushing) ..........................................................45
M25/M35/M44 xed motor schematics ...............................................................................................45
M35/M44 variable motor schematics ...................................................................................................45
M46 variable motor schematics ..............................................................................................................45
FEATURES AND OPTIONS
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520L0636 • Rev FD • August 2010
Series 40 Axial Piston Motors
Technical Information
General description
BASIC DESIGN Series 40 is a family of hydrostatic pumps and motors for medium power applications
with maximum loads of 345 bar [5000 psi]. These pumps and motors can be applied
together or combined with other products in a system to transfer and control hydraulic
power.
Series 40 transmissions (pump plus motor) provide an innitely variable speed range
between zero and maximum in both forward and reverse modes of operation. The
pumps and motors each come in four frame sizes: M25, M35, M44, and M46.
Series 40 pumps are compact, high power density units. All models use the parallel axial
piston / slipper concept in conjunction with a tiltable swashplate to vary the pump’s
displacement. Reversing the angle of the swashplate reverses the ow of uid from the
pump, reversing the direction of rotation of the motor output.
Series 40 M35, M44, and M46 pumps may include an integral charge pump to provide
system replenish ing and cooling uid ow, as well as servo control uid ow on M46
pumps. M25 pumps are designed to receive charge ow from an auxiliary circuit or
from a gear pump mounted on the auxiliary mounting pad. Series 40 pumps feature
a range of auxiliary mounting pads to accept auxiliary hydraulic pumps for use in
complementary hydraulic systems.
Series 40 M46 pumps offer proportional controls with either manual, hydraulic, or
electronic actuation. An electric three-position control is also available. The M25, M35,
and M44 pumps include a trunnion style direct displacement control.
Series 40 motors also use the parallel axial piston / slipper design in conjunction with
a xed or tiltable swashplate. The family includes M25, M35, M44 xed motor units and
M35, M44, M46 variable motor units.
The M35 and M44 variable motors feature a trunnion style swashplate and direct
displacement control. The M46 variable motors use a cradle swashplate design and a
two-position hydraulic servo control.
520L0636 • Rev FD • August 2010
6
Series 40 Axial Piston Motors
Technical Information
General description
KEY FEATURES • 3 sizes of variable displacement motors
• 3 sizes of xed displacement motors
• Efcient axial piston design
• Complete family of control systems
• Proven reliability and performance
• Compact, lightweight
• Worldwide sales and service
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520L0636 • Rev FD • August 2010
Series 40 Axial Piston Motors
Technical Information
General description
CROSS SECTIONS
Swashplate
Piston
Bearing
Cylinder
Displacement limiter
Cylinder block
Piston
Output shaft
Lip seal
Bearing
Cylinder block
Piston
Output shaft
Lip seal
Bearing
Cylinder block
Piston
Output shaft
Lip seal
Bearing
Servo piston
P101738E
Output shaft
Lip seal
Swash plate
M25 fixed motor (MF) M35/M44 variable motor (MV)
M35/M44 fixed motor (MF) M46 variable motor (MV) (SAE flange)
520L0636 • Rev FD • August 2010
8
Series 40 Axial Piston Motors
Technical Information
General description
SYSTEM CIRCUIT
DIAGRAM
Input
shaft
Suction flow
Servo pressure
High pressure
Case flow
Charge pressure
Output
shaft
Cylinder
block
assembly
Filter
Charge
pump
Reservoir
Fixed displacement
motor
Cylinder
block
assembly
Heat
exchanger
Check valves
w/ high pressure
relief valve
Variable
displacement
pump
Heat exchanger
bypass
Charge relief
valve
Displacement
control
valve
Control
handle
Bypass
valve
Loop flushing
module
P100 586E
A Series 40 M35 xed motor is shown in a hydraulic circuit with a Series 40 M46 variable pump. A loop ushing module
is included on the motor. The circuit features suction ltration and heat exchanger.
M46 MOTOR SCHEMATIC
The system ports (A and B) connect to the high pressure work lines. The motor receives pressurized uid in its inlet port
and discharges de-energized uid through the outlet port. Either port can act as inlet or outlet; ow is bidirectional.
System port pressure is gauged through ports M1 and M2. The motor has two case drains (L1 and L2). The motor may
include loop ushing. Loop ushing provides additional cooling and ltration capacity.
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520L0636 • Rev FD • August 2010
Series 40 Axial Piston Motors
Technical Information
Technical Specications
FEATURES AND OPTIONS
SPECIFICATIONS
Specications and operating parameters are shown below. Not all hardware options are
available for all congurations. For additional information, see Operating parameters, page
14, System design parameters, page 17, Product coding, page 21, Features and options, page 23
and Control options, page 32.
OVERVIEW
GENERAL
Model Unit M25MF M35 MF M44 MF M35MV M44MV M46 MV
Model configuration Fixed Fixed Fixed Variable Variable Variable
Type of mounting SAE B SAE B SAE B SAE B SAE B SAE B
Displacement cm
3
/rev
[in
3
/rev]
25 [1.50] 35 [2.14] 44 [2.65] 35 [2.14] 44 [2.65] 46 [2.80]
Weight kg [lbf] 11 [26] 11 [26] 11 [26] 21 [47] 21 [47] 23 [51]
Mass moment of inertia kg•m
2
[slug•ft
2
]
0.0018
[0.0013]
0.0033
[0.0024]
0.0032
[0.0023]
0.0033
[0.0024]
0.0032
[0.0023]
0.0050
[0.0037]
Model M25 MF M35 MF M44 MF M35 MV M44 MV M46 MV
Type of mounting SAE B SAE B SAE B SAE B SAE B SAE B or
Port connections Twin, Axial
Side, Twin,
Axial
Side, Twin,
Axial
Twin Twin
Side, Twin,
Axial
Output shaft options
Splined
Tapered
Splined
Tapered
Straight Key
Splined
Tapered
Straight Key
Splined Splined
Splined
Tapered
Control options - - - DDC DDC Hyd. 2-pos.
Loop flushing Option Option Option Option Option Option
Displacement limiters - - - Option Option Option
Speed sensors Option Option Option - - Option
520L0636 • Rev FD • August 2010
10
Series 40 Axial Piston Motors
Technical Information
Technical Specications
OPERATING
PARAMETERS
Ratings and data are based
on operation with premium
petroleum-based hydraulic
uids containing oxidation,
rust, and foam inhibitors.
FLUID SPECIFICATIONS
Parameter Unit Minimum Continuous Maximum
Viscosity mm
/sec (cSt)
[SUS]
7
[47]
12-60
[70-278]
1600
[7500]
Temperature °C [°F] -40 [-40] 82 [180] 104 [220]
Cleanliness ISO 4406 Class 18/13 or better
Filtration efciency suction ltration β
35-44
=75 (β
10
≥1.5)
charge ltration β
15-20
=75 (β
10
≥10)
Model M25 MF M35 MF M44 MF M35 MV M44 MV M46 MV
Case pressure bar [psi]
Continuous 1.7 [25]
Maximum 5.2 [75]
Speed limits min
-1
[rpm]
Rated @ max disp. 4000 3600 3300 3600 3300 4000
Maximum @ max. disp. 5000 4500 4100 4500 4100 4100
Rated @ min. disp. - - - 4200 3900 4500
Maximum @ min. disp. - - - 5300 4850 5000
System pressure bar [psi]
Continuous 210 [3000]
Maximum 345 [5000]
Hydraulic unit life is the life expectancy of the hydraulic components. Hydraulic unit life
is a function of speed and system pressure; however, system pressure is the dominant
operating variable affecting hydraulic unit life. High pressure, which results from high
load, reduces expected life.
It is desirable to have a projected machine duty cycle with per centages of time at various
loads and speeds. Sauer-Danfoss calculates appropriate design pressure from this
information. This method of selecting operating pressure is recom mended whenever
duty cycle information is available.
HYDRAULIC UNIT LIFE
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520L0636 • Rev FD • August 2010
Series 40 Axial Piston Motors
Technical Information
Technical Specications
PERFORMANCE
Motor performance as a function of operating speed
Motor performance as a function of operating speed
All pressure limits are differential pressures and assume normal charge pressure. Series
40 motors will meet satisfactory life expectancy if applied within the parameters
specied in this bulletin. For more detailed information on hydraulic unit life see
BLN-9884 Pressure and Speed Limits.
This performance graph provides typical volumetric and over all efciencies for Series 40
motors. These efciencies apply for all Series 40 motors at maximum displacement.
100
80
95
90
85
Efficiency - %
0255075100
Speed - % of Rated Speed
Volumetric Efficiency - 170 bar [2500 psi]
Volumetric Efficiency - 345 bar [5000 psi]
Overall Efficiency - 170 bar [2500 psi]
Overall Efficiency - 345 bar [5000 psi]
P100 455E
The performance map provides typical motor overall efciencies at various operating
param eters. These efciencies apply for all Series 40 motors at maximum displacement.
5000
0
4000
3000
2000
1000
System Pressure
0255075 100
Speed - % of Rated Speed
psi
345
0
270
210
140
bar
70
80%
85%
88%
89%
80%
85%
88%
89%
P100 456E
HYDRAULIC UNIT LIFE
(continued)
520L0636 • Rev FD • August 2010
12
Series 40 Axial Piston Motors
Technical Information
Technical Specications
BEARING LIFE AND
EXTERNAL SHAFT
LOADING
Bearing life is a function of speed, pressure and swashplate angle, plus any external loads.
Other life factors include oil type and viscosity.
In vehicle propulsion drives with no external loads, where the speed, pressure, and
swashplate angle are often changing, normal bearing ß
10
(90% survival) life will exceed
the hydraulic unit life.
In non-propel drives, such as conveyors or fan drives, the operating speed and pressure
may be nearly constant leading to a distinctive duty cycle compared to that of a
propulsion drive. In propel applications, Sauer-Danfoss recommends a bearing life
review.
Series 40 motors are designed with bearings that can accept some incidental external
radial and thrust loads. However, any amount of external load will reduce the expected
bearing life.
The allowable radial shaft loads are a function of the load position, the load orientation,
and the operating pressures of the hydraulic unit. All external shaft loads have an effect
on bearing life. In motor applications where external shaft loads cannot be avoided,
the impact on bearing life can be mini mized by orienting the load to the 180 degree
position (see Direction of external shaft load, next page).
The recommended maximum radial load (R
e
) is based on an external moment (M
e
) and
the distance (L) from the mounting ange to the load, (see table at below). The loads
in the table reect a worst case external load orientation (0 degrees), a continuously
applied working pressure of 140 bar (2000 psi), 20 bar (285 psi) charge pressure,
1800 min
-1
(rpm), and a bearing life (ß
10
) of 2000 hours. Avoid thrust loads in either
direction.
The recommended maximum allowable radial load is calculated as: R
e
= M
e
/ L
If continuously applied external radial loads exceed the recommended maximum
allowable, or thrust loads are known to occur, contact Sauer-Danfoss for an evaluation of
unit bearing life. Optional high capacity bearings are available.
Tapered output shafts or clamp-type couplings are recommended for applications
where radial shaft side loads are present.
R
e
Maximum radial side load
M
e
Maximum external moment
L Distance from mounting ange to point of load
F
B
Force of block (applies at center of gravity)
T Thrust load
M25 M35/44 M46
M
e
N•m [lbf•in] 29 [255] 25 [225] 24 [215]
Shaft loading parameters
Recommended maximum external shaft moments
13
520L0636 • Rev FD • August 2010
Series 40 Axial Piston Motors
Technical Information
Technical Specications
External shaft loads
Direction of external shaft load
BEARING LIFE AND
EXTERNAL SHAFT
LOADING
(continued)
L
R
e
F
B
T
P100 453E
0 Re
180 Re
90 Re 270 Re
Axis of swashplate
rotation
End vi
ew
of shaft
P100 454E
520L0636 • Rev FD • August 2010
14
Series 40 Axial Piston Motors
Technical Information
Operating parameters
FLUIDS
VISCOSITY
TEMPERATURE
CASE PRESSURE
Ratings and performance data are based on operating with premium hydraulic uids
containing oxidation, rust, and foam inhibitors. These include premium turbine oils, API
CD engine oils per SAE J183, M2C33F or G automatic transmission uids (ATF), Dexron
TM
II (ATF) meeting Allison
TM
C-3 or Caterpillar
TM
T0-2 requirements, and certain specialty
agricultural tractor uids. For more information on hydraulic uid selection, see Sauer-
Danfoss publications: 520L0463, Hydraulic Fluids and Lubricants, Technical Information,
and 520L465, Experience with Biodegradable Hydraulic Fluids, Technical Information.
Maintain uid viscosity within the
continuous range for maximum
efciency and bearing life. Minimum
viscosity should only occur during
brief occasions of maximum ambient
temperature and severe duty cycle
operation. Maximum viscosity should
only occur at cold start: Limit speeds until
the system warms up. See Sauer-Danfoss
publication: 520L0463, Hydraulic Fluids
and Lubricants, Technical Information
Maintain uid temperature within the
limits shown in the table. Minimum
temperature relates to the physical
properties of the component materials.
Cold oil will not affect the durability of
the motor components. However, it may
affect the ability of the motor to transmit
Fluid viscosity limits
Condition mm
2
/s (cSt) SUS
Minimum 7 47
Continuous 12-60 70-278
Maximum 1600 7500
Temperature limits
Minimum
(intermittent, cold start)
- 40° C [- 40° F]
Continuous 82.2° C [180° F]
Maximum 104.4° C [220° F]
power. Maximum temperature is based on material properties. Don’t exceed it. Measure
maximum temperature at the hottest point in the system. This is usually the case drain.
Ensure uid temperature and viscosity limits are concurrently satised.
Maintain case pressure within the limits
shown in the table. Ensure housing is
kept lled with hydraulic uid.
Case pressure limits
Maximum (continuous) 1.7 bar [25 psi]
Intermittent (cold start) 5.2 bar [75 psi]
C Caution
Operating outside of case pressure limits will damage the motor. To minimize this risk,
use full size inlet and case drain plumbing, and limit line lengths.
15
520L0636 • Rev FD • August 2010
Series 40 Axial Piston Motors
Technical Information
Operating parameters
PRESSURE RATINGS The table, Operating parameters, page 10, gives maximum and continuous pressure
ratings for each displacement. Not all displacements operate under the same pressure
limits. Denitions of the operating pressure limits appear below.
System pressure is the differential pressure between system ports A and B. It is the
dominant operating variable affecting hydraulic unit life. High system pressure, which
results from high load, reduces expected life. System pressure must remain at or below
continuous working pressure during normal operation to achieve expected life.
Continuous working pressure is the average, regularly occurring operating pressure.
Operating at or below this pressure should yield satisfactory product life.
Maximum (peak) working pressure is the highest intermittent pressure allowed.
Maximum machine load should never exceed this pressure. For all applications, the load
should move below this pressure.
All pressure limits are differential pressures referenced to low loop (charge) pressure.
Subtract low loop pressure from gauge readings to compute the differential.
System pressure limits
Pressure Limits bar psi
Continuous 210 3000
Maximum 345 5000
520L0636 • Rev FD • August 2010
16
Series 40 Axial Piston Motors
Technical Information
Operating parameters
SPEED RATINGS The table, Operating parameters, page 10, gives rated and maximum speeds for each
displacement. Not all displacements operate under the same speed limits. Denitions of
these speed limits appear below.
Rated speed is the maximum recommended operating speed at full power condition.
Operating at or below this speed should yield satisfactory product life. In vehicle propel
applications, maximum motor speed during unloaded, on-road travel over level ground
should not exceed this limit.
Maximum speed is the highest operating speed permitted. Exceeding maximum speed
reduces motor life and can cause loss of hydrostatic power and braking capacity. Never
exceed the maximum speed limit under any operating conditions.
W Warning
Unintended vehicle or machine movement hazard.
The loss of hydrostatic drive line power, in any mode of operation (forward, neutral, or
reverse) may cause the system to lose hydrostatic braking capacity. You must provide a
braking system, redundant to the hydrostatic transmission, sufcient to stop and hold
the vehicle or machine in the event of hydrostatic drive power loss.
Speed limits
Limit min
-1
(rpm)
M25 MF M35 MF M44 MF M35 MV M44 MV M46 MV
Rated at max. displ...
4000 3600 3300 3600 3300 4000
Maximum at max. displ...
5000 4500 4100 4500 4100 4100
Rated at min. displ...
- - - 4200 3900 4500
Maximum at min. displ...
- - - 5300 4850 5000
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520L0636 • Rev FD • August 2010
Series 40 Axial Piston Motors
Technical Information
System design parameters
SIZING EQUATIONS
Based on SI units Based on US units
SI units [US units]
V
g
= Displacement per revolution cm
3
/rev [in
3
/rev]
p
O
= Outlet pressure bar [psi]
p
i
= Inlet pressure bar [psi]
∆p = p
O
- p
i
(system pressure) bar [psi]
n = Speed min
-1
(rpm)
η
v
= Volumetric efciency
η
m
= Mechanical efciency
η
t
= Overall efciency (η
v
• η
m
)
Variables
Flow
Torque
Power
Input ow Q = (l/min)
Motor speed n = (min
-1
)
Output torque M = (N•m)
Output power P = (kW)
V
g
• ∆p • η
m
20 • π
Q • ∆p • η
t
600
V
g
• n
1000 • η
v
Q • 1000 • η
v
V
g
Speed
Input ow Q = (US gal/min)
Motor speed n = (min
-1
)
Output torque M = (lbf•in)
Output power P = (hp)
V
g
• ∆p • η
m
2 • π
Q • ∆p • η
t
1714
V
g
• n
231 • η
v
Q • 231 • η
v
V
g
Use the following equations to compute output power, torque, speed, and input
ow. Selecting the right motor starts with an evaluation of system requirements
such as speed and torque. Select a motor that will transmit the required torque, then
select a pump that will meet the ow and pressure requirements of the motor. For
more information on hydrostatic drive selection, refer to Sauer-Danfoss applications
guideline BLN-9885, Selection of Drive Line Components.
520L0636 • Rev FD • August 2010
18
Series 40 Axial Piston Motors
Technical Information
System design parameters
FILTRATION To prevent damage to the system, including premature wear, uid entering the motor
must be free of contaminants. Series 40 motors require system ltration capable of
maintaining uid cleanliness at ISO 4406-1999 class 22/18/13 or better.
Consider these factors when selecting a system lter:
• Cleanliness specications
• Contaminant ingression rates
• Flow capacity
• Desired maintenance interval
The lter may be located either on the inlet (suction ltration) or discharge (charge
pressure l tration) side of the charge pump. Series 40 pumps are available with
provisions for either suction or charge pressure ltration to lter the uid entering the
charge circuit (see next page).
Typically, a lter with a beta ratio of β
10
= 1.5 to 2.0 is adequate. However, open circuit
systems supplied from a common reservoir may have considerably higher requirements.
Because each system is unique, only a thorough testing and evaluation program can
fully validate the ltration system. For more information, see Sauer-Danfoss publication
520L0467, Design Guidelines for Hydraulic Fluid Cleanliness.
BYPASS VALVE In some applications it is desirable to bypass uid around the variable displacement
pump, for example; to allow a vehicle to move short distances at low speeds without
running the prime mover. This is done by opening a manually operated bypass valve.
This valve connects both sides of the pump/motor circuit and allows the motor to turn.
During normal operation, this valve must be fully closed .
Bypass valves are available in Series 40 pumps. See Sauer-Danfoss publication:
520L0635, Series 40 Pumps Technical Information.
Bypass valves are intended for moving a machine or vehicle for very short distances at
very slow speeds. They are NOT intended as tow valves.
19
520L0636 • Rev FD • August 2010
Series 40 Axial Piston Motors
Technical Information
System design parameters
LOOP FLUSHING VALVE Series 40 motors may incorporate an integral loop ushing valve. Installations that
require additional uid to be removed from the main hydraulic circuit because of uid
cooling or cleanliness requirements, will benet from loop ushing. A loop ushing valve
will remove heat and contaminants from the main loop at a rate faster than otherwise
possible. Contact your Sauer-Danfoss representative for production availability on
specic frame size motors.
Series 40 loop ushing valves include a loop ushing relief valve with integral orice. The
ushing ow is a function of the pump charge relief valve, and the orice size.
Loop ushing ows of 3 to 7 l/min [0.75 to 2 US gal/min] are adequate for most
applications. Contact your Sauer-Danfoss representative for assistance.
W WARNING
Incorrect charge pressure settings may result in the inability to build required system
pressure and/or inadequate loop ushing ows. Maintain correct charge pressure under
all conditions.
Loop flushing
relief valve
with orifice
Loop flushing
shuttle valve
P100 448E
Loop flushing valve
15.14
[4.00]
11.36
[3.00]
3.79
[1.00]
0
8.62
[125]
12.07
[175]
15.51
[225]
Charge pressure bar [psi]
19.96
[275]
22.41
[325]
25.86
[375]
7.57
[2.00]
Fl
ow
l/min [US gal/min]
P100 643E
Typical loop flushing flow as a function of
charge pressure
520L0636 • Rev FD • August 2010
20
Series 40 Axial Piston Motors
Technical Information
System design parameters
W Warning
Unintended vehicle or machine movement hazard.
The loss of hydrostatic drive line power, in any mode of operation (forward, neutral, or
reverse) may cause the system to lose hydrostatic braking capacity. You must provide a
braking system, redundant to the hydrostatic transmission, sufcient to stop and hold
the vehicle or machine in the event of hydrostatic drive power loss.
REDUNDANT BRAKING
SYSTEM REQUIREMENT
RESERVOIR The reservoir provides clean uid, dissipates heat, and removes entrained air from the
hydraulic uid. It allows for uid volume changes associated with uid expansion and
cylinder differential volumes. Minimum reservoir capacity depends on the volume
needed to perform these functions. Typically, a capacity of one half the charge pump
ow (per minute) is satisfactory for a closed reservoir. Open circuit systems sharing a
common reservoir will require greater uid capacity.
Locate the reservoir outlet (suction line) near the bottom, allowing clearance for settling
foreign particles. Use a 100 - 125 µm screen covering the outlet port. Place the reservoir
inlet (return lines) below the lowest expected uid level, as far away from the outlet as
possible. Use a bafe (or bafes) between the reser voir inlet and outlet ports to reduce
aeration and uid surging.
OVERPRESSURE
PROTECTION
Series 40 motors (as well as other system components) have pressure limits. Relief valves
or pressure limiters should be present in the high pressure circuit to protect components
from excessive pressures.
Series 40 motors are available with a range of high pressure relief valve settings.
C Caution
High pressure relief valves are intended for transient overpressure protection and are not
intended for continuous pressure control. Operation over relief valves for extended peri-
ods of time may result in severe heat build up. High ows over relief valves may result
in pressure levels exceed ing the nominal valve setting and potential damage to system
compo nents.
21
520L0636 • Rev FD • August 2010
Series 40 Axial Piston Motors
Technical Information
Product coding
REVISED MODEL CODE The model code is a modular description of a specic product and its options. To create
an order code to include the specic options desired, see the Series 40 Motor Model Code
Supplement or the Series 40 Price Book.
NAME PLATE
Name plate
Place of manufacture
Model
number
Serial
number
Model
code
Made in USA
Model-No/Ident-No.
R NN A A BLL DR A
FF A CNN
MMV 046 C B A B A A
Model Code
Serial-No A - 96 - 26 - 12345
M46-2001
P101 372E
MODEL CODE MODULES
M
M
V
S
4
6 C
Product
Disp
l
acement
Type
C
D E F G
T
Z
*
*
*
-
-
-
- -
P104 427E
C Seal group
D Output shaft/through shaft conguration
E Endcap conguration
F Cylinder block group
G Housing conguration
T Special hardware features
Z Special features (non-hardware) *** = None
Fixed motor
520L0636 • Rev FD • August 2010
22
Series 40 Axial Piston Motors
Technical Information
Product coding
M
M
V
S
4
6 C
Product
Disp
l
acement
Type
C
D E F G
T
Z
*
*
*
-
-
-
- -
P104 427E
C Seal group
D Output shaft/through shaft conguration
E Endcap conguration
F Control features
G Housing conguration
T Special hardware features
Z Special features (non-hardware) *** = None
Variable motorMODEL CODE MODULES
(continued)
23
520L0636 • Rev FD • August 2010
Series 40 Axial Piston Motors
Technical Information
Features and options
DISPLACEMENT LIMITERS M35, M44, and M46 variable motors have minimum displacement limiters. Minimum
unit dis placement is obtained with the adjuster screw at its maximum extension from
the end cap or displacement control piston cover. All motors are shipped with the
displacement limiter set for minimum motor displacement.
The M35 and M44 MV minimum displacement limiter is located in the end cap. The
M46 MV minimum displacement limiter is located in the displacement control piston
cavity. The length and conguration of this limiter will depend upon the control option
installed in the motor.
M46 MV units may have an optional mechanical maximum displacement limiter
located in the displacement control piston cover. The maximum displace ment limit can
be adjusted by loosening the sealing lock nut, adjusting displacement by rotating the
screw with a screwdriver, then locking the adjuster by torquing the sealing lock nut.
Maximum unit dis placement is obtained with the adjuster screw standing at its
maximum height out of the displacement control piston cover. All motors are shipped
with the limiter set for maximum motor displacement.
WWARNING
Undesirable output
speed hazard.
Take care adjusting
displacement limiters.
Too low of a minimum
displacement setting
can result in higher than
expected output speed.
Retorque the sealing
locknut after every
adjustment to prevent
an unexpected changes
and to prevent external
leakage.
Swashplate
Displacement limiter
P100 449E
Sealing locknut
P100 450E
Fixed minimum
displacement limiter
Adjustable minimum
displacement limiter
Adjustable maximum
displacement limiter
Displacement limiter M35/M44 MV Displacement limiter M46 MV
520L0636 • Rev FD • August 2010
24
Series 40 Axial Piston Motors
Technical Information
Features and options
SPEED SENSOR OPTION Series 40 motors are available with a speed sensor option for direct measurement of
motor output speed. You can use this sensor may to sense the direction and speed of
motor rotation.
A special magnetic speed ring is pressed onto the outside diameter of the cylinder
block. A hall effect pulse pickup is located in the motor housing. The sensor accepts
supply voltage and outputs a digital pulse signal in response to the speed of the ring.
The output changes its high/low state as the north and south poles of the permanently
magnetized speed ring pass by the face of the sensor. The digital signal is generated at
frequencies suitable for microprocessor based controls.
This sensor will operate with a supply voltage of 4.5 to 15 Vdc, and requires a current of
12 mA at 5.0 Vdc (minimum) under no load. Maximum operating current is 20 mA at 5
Vdc (maximum). Maximum operating frequency is 15 kHz. Output voltage in High State
(VOH) is sensor supply voltage minus 0.5 Vdc, minimum. Output voltage in Low State
(VOL) is 0.5 Vdc, maximum. The sensor is available with a Packard Weather-Pack
TM
or 4-
pin sealed connector.
Contact your Sauer-Danfoss representative for production availability on specic motor
frame sizes, or for special speed sensor options.
Supply voltage 4.5 - 15 Vdc
Required current
12 mA @ 5 Vdc
(no load)
Maximum current 20 mA @ 5Vdc
Maximum frequency 15 kHz
VOH Supply Vdc - 0.5 Vdc
VOL 0.5 Vdc maximum
Magnetic ring
Pulses/revolution
M25 M35 M44 M46
43 46 46 51
Connector
Packard Weather-Pack
TM
3- pin, 4-pin
Speed sensor
Magnetic ring
Cylinder block
P100 452E
Speed sensor specifications Speed sensor cross section
25
520L0636 • Rev FD • August 2010
Series 40 Axial Piston Motors
Technical Information
Features and options
PULSE PICKUP AND
CONNECTOR
Red
Red
White
Black
Black
Green
Supply voltage +
Supply voltage +
Speed signal
Speed signal
Direction
Ground common
Ground common
A
A
B
B
C
C
D
PackardWeather-Pack
4 pin tower connector
3 pinWeather-Pack
shroud
White
P100 451E
TM
TM
Mating parts kit part number K03379 (4 pin)
Mating parts kit part number K20582 (3 pin)
Speed sensor with directional signal
Speed sensor without directional signal
520L0636 • Rev FD • August 2010
26
Series 40 Axial Piston Motors
Technical Information
Features and options
SHAFT OPTIONS Series 40 motors are available with a variety of splined, straight keyed, and tapered
shaft ends. Nominal shaft sizes and torque ratings for some available shafts are shown
in the accompany ing table. Other shaft options may exist. Contact your Sauer-Danfoss
representative for availability.
Torque ratings assume no external radial loading. Continuous torque ratings for splined
shafts are based on spline tooth wear, and assume the mating spline has a minimum
hardness of R
c
55 to full spline depth and coupling has good lubrication.
Maximum torque ratings are based on shaft torsional strength and assume a maximum
of 200,000 load reversals.
N•m [lbf•in] M25 MF M35 MF M44 MF M35 MV M44 MV M46 MV
Spline
13-tooth,
16/32 pitch
Continuous 80 [750] 73 [650] 73 [650] 73 [650] 73 [650]
73 [650]
Max 140 [1240] 226 [2000] 226 [2000] 226 [2000] 226 [2000] 226 [2000]
Spline
15-tooth,
16/32 pitch
Continuous - 153 [1350] 153 [1350] 153 [1350] 153 [1350] 153 [1350]
Max
-
362 [3200] 362 [3200] 362 [3200] 362 [3200] 362 [3200]
Spline
19-tooth
16/32 pitch
Continuous - - - - - 194 [1710]
Max
- - - - -
460 [4070]
Tapered
1.00 inch
Max 140 [1240] 497 [4400] 497 [4400] - - 497 [4400]
Straight
keyed
0.875 inch
Max - 226 [2000] 226 [2000] - - -
Recommended mating splines for Series 40 splined output shafts should be in
accordance with ANSI B92.1 Class 5. Sauer-Danfoss external splines are modied Class
5 Fillet Root Side Fit. The external spline Major Diameter and Circular Tooth Thickness
dimensions are reduced in order to assure a clearance t with the mating spline.
THROUGH-SHAFT
OPTIONS
Optional through-shafts are available on Series 40 xed and variable displacement motors
(as noted in the accompanying table). Through-shafts are provided for use in secondary
(parking) braking systems. Through-shaft ends are not intended for continuous power
transmission.
WWARNING
Potential loss of braking capacity.
Exceeding these torque limits could cause shaft breakage. Ensure your application never
exceeds maximum torque limits under any operating conditions.
Frame size Shaft spline Max. torque limit
N•m [lbf•in]
M35 MF 13T 16/32 P 328 [2900]
M44 MF 13T 16/32 P 328 [2900]
M46 MV(SAE) 13T 16/32 P 328 [2900]
Shaft availability and torque ratings
Through-shaft availability and torque limitations
27
520L0636 • Rev FD • August 2010
Series 40 Axial Piston Motors
Technical Information
Shaft options
Contact SAUER-DANFOSS Application Engineering for specic installation drawings. Dimensions in mm [in]
M25 MF
Code Description
Torque rating
Drawing
Maximum torque
rating
N•m [lbf•in]
Continuous torque
rating
N•m [lbf•in]
E 13-tooth
16/32 pitch
(ANSI B92.1 1970 - Class 5)
140 [1240] 80 [750]
20.638 [0.8125] pitch dia.
30° pressure angle
13 teeth, 16/32 pitch
fillet root side fit
per ANSI B92.1 class 5
also mates with
flat root side fit
21.717 dia.
[0.8550]
18.8 max.
[0.74]
16.5 [0.65]
Full spline
7.9 [0.31]
33.32 max.
[1.312]
Coupling must not protrude
beyond this surface
Mounting
flange
(ref.)
P104 428E
N Ø 25.4 mm [1.000 in]
1:8 taper
140 [1240] —
0.750-16 UNF-2A thd.
22.22 Gauge dia.
[0.875]
38.1 [1.500] taper per foot
per SAE J5001
25.4 [1.000] nominal shaft dia.
3.81 max. [0.150]
6.30 x 22.22 dia. Woodruff key
[0.248x0.875]
0.25 [0.01] min. R on edges
33.3 Gauge dim.
[1.311]
42.8 [1.68]
27 [1.06]
Coupling must not
protrude beyond
25.4 max. [1.000]
Mounting
flange
(ref.)
P104 429E
520L0636 • Rev FD • August 2010
28
Series 40 Axial Piston Motors
Technical Information
Shaft options
Contact SAUER-DANFOSS Application Engineering for specic installation drawings.
Dimensions in mm [in]
M35/44 MF
Code Description
Torque rating
Drawing
Maximum torque
rating
N•m [lbf•in]
Continuous torque
rating
N•m [lbf•in]
A, C Splined output shaft (see
table)
13 tooth 226 [2000] 13 tooth 73 [650]
T dia.
V dia.
W pitch dia.
30° pressure angle
Y teeth, Z pitch
fillet root side fit
per ANSI B92.1-1970 class no.5
also mates with flat
root side fit
S
7.65 [0.301]
U
Coupling must not
protrude beyond
this surface
Mounting
flange
(ref.)
P104 430E
F 15 tooth 362 [3200] 15 tooth 153 [1350]
Shaft
option
Shaft length
S
Shaft diameter
T
Full spline
U
Major dia.
V
Pitch dia.
W
No.
teeth
Y
Pitch
Z
Thru
shaft
A
33.55 [1.321] 18.8 [0.74] 16.5 [0.65] 21.72 [0.8550]
20.638
[0.8125]
13 16/32 ---
C 33.55 [1.321] 18.8 [0.74] 16.5 [0.65] 21.72 [0.8550]
20.638
[0.8125]
13 16/32 13T
F 33.55 [1.321] 21.98 [0.865] 18.5 [0.73] 24.89 [0.9800]
23.812
[0.9375]
15 16/32 ---
M35 / M44 MF splined shaft option
29
520L0636 • Rev FD • August 2010
Series 40 Axial Piston Motors
Technical Information
Shaft options
Contact SAUER-DANFOSS Application Engineering for specic installation drawings.
Dimensions in mm [in]
M35/44 MF (CONTINUED)
Code Description
Torque rating
Drawing
Maximum torque
rating
N•m [lbf•in]
Continuous torque
rating
N•m [lbf•in]
N Ø 25.4 mm [1.000 in]
1:8 taper
497 [4400] —
0.750-16 UNF-2A thd.
22.22 gauge dia.
[0.875]
38.1 [1.500] taper per foot
per SAE J501
25.4 [1.000] nominal shaft dia.
3.81 max. [0.150]
6.30 x 22.22 dia. Woodruff key
[0.248 x 0.875]
0.25 [0.01] min. R on edges
33.3 gauge dim.
[1.311]
42.8 [1.68]
27 [1.06]
Coupling must not
protrude beyond
25.4 max. [1.000]
Mounting
flange
(ref.)
P104 431E
Y Ø 22.2 mm [0.874 in]
straight keyed
226 [2000] —
C oup
l
ing must not
protrude beyond
this sur fac e
7.65 [0.301]
22.2 di a.
[0.874 ± 0.001]
2.84 ma x.
[0.112]
6.35 [0.250] sq. ke y
38.1 [1.500] long
0.38 [0.015] min. R
on edges
64.74 ±0.025
[2.549] ±0.64
9.4 [0.37]
Mounting
flange
(ref.)
P104 432E
± 0.03
520L0636 • Rev FD • August 2010
30
Series 40 Axial Piston Motors
Technical Information
Shaft options
Contact SAUER-DANFOSS Application Engineering for specic installation drawings.
Dimensions in mm [in]
M35/44 MV
Code Description
Torque rating
Drawing
Maximum torque
rating
N•m [lbf•in]
Continuous torque
rating
N•m [lbf•in]
A Splined output shaft (see
table)
73 [650] 226 [2000]
T dia.
V dia.
W pitch dia.
30° pressure angle
Y teeth, 16/32 pitch
fillet root side fit
per ANSI B92.1 class no.5
also mates with flat
root side fit
S
U
Coupling must not
protrude beyond
this surface
7.87
[0.310]
Mounting
flange
(ref.)
P104 433E
Shaft
option
Max.
coupling
engagement
S
Shaft
diameter
T
Full spline
length
U
Major dia.
V
Pitch dia.
W
No. teeth
Y
Pitch
Thru
shaft
A 33.3 [1.31] 18.8 [0.74] 16.5 [0.65]
21.72
[0.855]
20.638
[0.8125]
13 16/32 ---
M35 / M44 MV splined shaft option
31
520L0636 • Rev FD • August 2010
Series 40 Axial Piston Motors
Technical Information
Shaft options
Contact SAUER-DANFOSS Application Engineering for specic installation drawings. Dimensions in mm [in]
M46 MV
Code Description
Torque rating
Drawing
Maximum torque
rating
N•m [lbf•in]
Continuous torque
rating
N•m [lbf•in]
A, B, Splined output shaft (see
table)
13 tooth 226 [2000] 13 tooth 73 [650]
W pitch dia.
30° pressure angle
Y teeth, Z pitch
fillet root side fit
per ANSI B92.1 class no.5
also mates with flat
root side fit
V dia.
U Full Spline
S max.
T max. dia.
7.47 [0.294]
Mounting
flange
(ref.)
Coupling must not protrude
beyond this surface
R
P104 434E
E, F, 15 tooth 362 [3200] 15 tooth 153 [1350]
D 19 tooth 460 [4070] 19 tooth 194 [1710]
J 25.4 [1.000]
tapered shaft
— 497 [4400]
5.05 [0.199]
6.30 x 22.22 dia. woodruff key
[0.248 x 0.875]
1/8 taper [1.500 per foot]
per SAE standard J501
25.4 [1.000] nominal shaft dia.
37.62
[1.481]
36.58 [1.440]
max.
26.97
[1.062]
9.17 gauge dim.
[0.361]
Coupling must not protrude
beyond this surface
3/4 - 16 Thd.
22.22 [0.875]
gauge dia.
Mounting
flange
(ref.)
P104 435E
Shaft
option
Shaft
extension
R
Max.
coupling
engagement
S
Shaft
diameter
T
Full
spline length
U
Major dia.
V
Pitch dia.
W
No.
teeth
Y
Pitch
Z
Thru
shaft
A
32.94
[1.297]
32
[1.26]
19.1
[0.75]
15.8
[0.62]
21.72
[0.855]
20.638
[0.8125]
13 16/32 ---
B
32.94
[1.297]
32
[1.26]
19.1
[0.75]
15.8
[0.62]
21.72
[0.855]
20.628
[0.8125]
13 16/32 13T
E
37.72
[1.485]
36.6
[1.44]
22.3
[0.88]
22.86
[0.90]
24.89
[0.980]
23.812
[0.9375]
15 16/32 ---
F
37.72
[1.485]
36.6
[1.44]
22.3
[0.88]
22.86
[0.90]
24.89
[0.980]
23.812
[0.9375]
15 16/32 13T
D
37.72
[1.485]
36.6
[1.44]
28.4
[1.114]
22.35
[0.88]
31.24
[1.230]
30.162
[1.1875]
19 16/32 ---
M46 MV splined shaft option
520L0636 • Rev FD • August 2010
32
Series 40 Axial Piston Motors
Technical Information
Control options
DIRECT DISPLACEMENT
CONTROL (DDC)
The direct displacement control is available on either side of the M35 and M44 variable
motors. It pro vides a simple, positive method of displacement control. Movement of
the control shaft causes a propor tional swashplate movement, thus varying the motor’s
displacement from full to minimum displacement.
Neutral position is not factory set, nor is there any internal neutral return mechanism.
The application must include provisions for all control linkage and neutral return
functionality.
External Control Handle Requirements
Maximum allowable trunnion torque is 79.1 N•m [700 lbf•in]. Minimum torque necessary
to hold the swash plate per 70 bar of differential system pressure is 11.3 N•m [100 lbf•in].
Maximum trunnion angle is 16° for M35 and M44.
DDC on left side of M35 motor Motor displacement vs swashplate rotation
Max. torque N•m [lbf•in] 79.1 [700]
Min. torque to hold (per 70 bar
[1000 psi] system pressure)
N•m [lbf•in]
11.3 [100]
Max. angle 16°
Minimum
swashplate angle
16° for M35
16° for M44
P100 457E
100%
Min.
Trunnion rotation
Motor
displacement
P100 458E
WWARNING
Unintended vehicle
movement hazard.
Internal forces may not
return the swashplate to
the neutral position under
all operating conditions.
DDC input specifications
33
520L0636 • Rev FD • August 2010
Series 40 Axial Piston Motors
Technical Information
Control options
TWO-POSITION
HYDRAULIC CONTROL
Series 40 M46 variable displacement motors are equipped with a hydraulically controlled
swashplate. The motor is spring biased toward maximum displacement. A hydraulic
piston is used to shift the swashplate from maximum to minimum displacement. A single
or two-line control can regulate the servo piston.
With the standard single-line control option, hydraulic pressure is supplied to the
control port (X1) to shift the motor to minimum displacement. The opposite end of the
displacement control piston internally drains to the motor case. The swashplate shifts
with a minimum pressure of 13.8 bar [200 psi]. The bias spring returns the motor to
maximum displacement when control pressure is removed.
The single-line control generally uses a customer supplied 2-position, 3-way control
valve. Hydraulic pressure on the control piston must not exceed 27.6 bar [400 psi].
In applications which encounter frequent shifting on-the-go as part of the normal duty
cycle, we recommend the optional two-line control. Applications with routine shifting
from work range to travel range may not require the two-line control. to command
minimum displacement, port control pressure to port X1 and drain port X2. To command
maximum displacement, port control pressure to port X2 and drain port X1.
The two-line control generally uses a customer supplied 2-position, 4-way control valve.
Hydraulic pressure on the control piston must not exceed 27.6 bar (400 psi).
Orices in either (or both) the control valve supply and drain lines optimize the shift rate
for either the single or two-line control. Contact your Sauer-Danfoss representative for
additional information.
Single line control Two line control
Max. pressure on control 27.6 [400] 27.6 [400]
Min. pressure to shift 13.8 [200] 13.8 [200]
Control valve
(customer supplied)
2-position / 3 way 2-position / 4-way
Input specifications bar [psi]
Port X1
Control pressure supply
(for minimum displacement)
Port X2
Control pressure supply
(for maximum displacement)
Top
Bottom
P100 459E
Single-line control Two-line control
M46 2-position hydraulic controls
520L0636 • Rev FD • August 2010
34
Series 40 Axial Piston Motors
Technical Information
Installation drawings
*All ports are SAE straight thread o-ring ports per SAE J514, unless otherwise specied.
Shaft rotation is determined by viewing motor from output shaft end.
Contact SAUER-DANFOSS Application Engineering for specic installation drawings.
Dimensions in mm [in]
M25 MF: AXIAL PORTS,
TWIN PORTS, LOOP
FLUSHING, SPEED
SENSOR
Motor shaft rotation Port A Port B
Clockwise (CW) In Out
Counterclockwise (CCW) Out In
65.91
[2.595]
26.67 [1.050]
(2) Places
7/8 - 14*
Po rt A (T win po rt
option)
7/8 - 14*
Po rt B
(T win po rt option)
78.9
[3.11]
64.26 [2.530]
(2) Places
26.67 [1.050]
(2) Places
25.4 [1.000]
56. 9
[2.24]
(2) Places
64.8 [2.55]
(2) Places
162. 8
[6.41]
134. 5
[5.29]
(2) places
64.97 mi n
[2.558]
101.57
[3.999]
3/4 - 16 SAE*
case outlet L1
76.7
[3.02]
9.4
[0.37]
48.8
[1.92]
9/16 - 18*
System pressur e
gauge por ts M1 and M2
3/4 - 16*
case outlet
(alternate) L2
3.89
[98.9]
Lo op flushing
relief v alv e
Lo op flushing
shuttle v alv e
143.0
[5.63]
Speed sensor
option
P ack ar dW eather-pack
4-w ay conn. (male)
mates with
P ack ard par
t no . 12015797
4-w ay tower (f emale)
or
Sauer Danf oss
k it no . K03384
7/8 - 14*
Po rt A (Axial port
option)
7/8 - 14*
Po rt B
(Axial po rt option)
94.488
[3.72]
P100 565E
TM
TM
Axial or twin ports
With loop flushing
Flow direction
35
520L0636 • Rev FD • August 2010
Series 40 Axial Piston Motors
Technical Information
Installation drawings
Dimensions in mm [in]
*All ports are SAE straight thread o-ring ports per SAE J514, unless otherwise specied.
Shaft rotation is determined by viewing motor from output shaft end.
Contact SAUER-DANFOSS Application Engineering for specic installation drawings.
M25 MF: MOUNTING
FLANGE
87.2
[3.44]
(2) places
73.02
[2.875]
(2) places
14.27 [0.562] dia.
(2) places
CW
CCW
P100 566E
M35/M44 MF: MOUNTING
FLANGE
66.55 [2.620]
Case drain - L1 and L2
both sides
70.36
[2.77]
(2) places
87.25
[3.435]
(2) places
14.27 dia.
[0.562] (2) places
Approx. center
of gravity
CW
CCW
4.06
[0.16]
P100 569E
520L0636 • Rev FD • August 2010
36
Series 40 Axial Piston Motors
Technical Information
Installation drawings
*All ports are SAE straight thread o-ring ports per SAE J514, unless otherwise specied.
Shaft rotation is determined by viewing motor from output shaft end.
Contact SAUER-DANFOSS Application Engineering for specic installation drawings.
Dimensions in mm [in]
M35/M44 MF: AXIAL
PORTS, TWIN PORTS,
LOOP FLUSHING, SPEED
SENSOR
77. 1
[3.04]
79. 5
[3.13]
71. 9
[2.83]
Po rt A
77. 7
[3.06]
(2) Places
Po rt B
7/8 -20*
System pressur e
gauge po rt - M1
7/8 -20*
System pressur e
gauge po rt - M2
23. 9
[0.94]
(2) Places
Lo op flushing
va lv e (option)
78. 2
[3.08]
1-1/16 -12*
(2) places
154. 6
[6.08]
186. 3
[7.34]
92. 1
[3.63]
12. 8
[0.51]
99. 1
[3.90]
Lo op flushing
shuttle va lv e (option)
Speed sensor
option
Housing w/ optional
speed sensing
105. 6
[4.16]
44. 5
[1.75]
71. 9
[2.83]
89. 7
[3.53]
1-1/16 -12*
(2) places
7/8 -14*
Case drain - L3
40. 1
[1.58]
(2) places
P ack ar dW eather-P ack 4-w
ay conn. (male)
mates with P ack ard
par t no. 12015797
4-w ay tower (f emale)
or Sauer-Danf oss ki t no . K03384
185. 4
[7.30]
186. 8
[7.335]
101.57
[3.999]
9. 4
[0.37]
30. 5
[1.20]
7/16 -20*
System pressur e
gauge po rt - M1
7/16 -20*
System pressur e
gauge po rt - M2
23. 9
[0.94]
Lo op flushing
Relief va lv e (option)
78. 2
[3.08]
Lo op flushing
shuttle va lv e (option)
P100 567E
TM
TM
Motor shaft
rotation
Port A Port B
Clockwise In Out
Counterclockwise Out In
Axial ports
Twin ports
Flow direction
37
520L0636 • Rev FD • August 2010
Series 40 Axial Piston Motors
Technical Information
Installation drawings
Dimensions in mm [in]
*All ports are SAE straight thread o-ring ports per SAE J514, unless otherwise specied.
Shaft rotation is determined by viewing motor from output shaft end.
Contact SAUER-DANFOSS Application Engineering for specic installation drawings.
M35/M44 MF: SIDE
PORTS, THROUGH SHAFT
186.3
[7.34]
184.9
[7.28]
17.8
[0.70]
154.6
[6.09]
161.3
[6.35]
1-1/16 -12*
(2) places
92.1
[3.63]
12.8
[0.51]
99.1
[3.90]
Approx. center
of gravity
7/8 -14*
Case drain - L2
67.3
[2.65]
(2) places
89.7
[3.53]
71.9
[2.83]
77.7
[3.06]
(2) places
65.9
[2.60]
(2) places
7/8 -14*
Case drain - L3
44.5
[1.75]
Port
B
Port A
Aux. shaft option
Auxiliary drive spline data:
20.638 pitch diameter
[0.8125]
30° pressure angle
13 teeth, 16/32 pitch
fillet root side fit
ANSI B92.1-1790 class no.5
also mates with flat
root side fit
161.3
[6.35]
184.0
[7.25]
218.29
[8.594]
1-1/16 -12*
(2) places
21.72
[0.855]
21.1 [0.83]
Full spline
length
36.8 max.
[1.45]
Coupling must not
protrude beyond
this surface
6.3
[0.25]
151.00
[5.95]
7/8 -14*
Case drain - L3
29
[1.14]
(2) Places
67.3
[2.63]
89.7
[3.53]
71.9
[2.83]
70.5
[2.77]
50.813
[2.000]
65.91
[2.60]
1/2 -13Thd.
92 Min. Full Thd.
[23.3]
(2) places
67.3
[2.63]
92.1
[3.63]
12.8
[0.51]
99.1
[3.90]
Approx. center
of gravity
7/8 -14*
Case drain - L2
P100 568E
Side ports
Side ports with thru shaft
520L0636 • Rev FD • August 2010
38
Series 40 Axial Piston Motors
Technical Information
Installation drawings
*All ports are SAE straight thread o-ring ports per SAE J514, unless otherwise specied.
Shaft rotation is determined by viewing motor from output shaft end.
Contact SAUER-DANFOSS Application Engineering for specic installation drawings.
Dimensions in mm [in]
M35/M44 MV: TWIN
PORTS
164.7
[6.48]
96.4
[3.80]
1-1/16 -12*
Case outlet
1-1/16 -12*
Port A
1-1/16 -12*
Port B
35
[1.38]
35
[1.38]
95
[3.74]
7.6
[0.301]
16° max.
Disp.
min.
Disp.
66.7
[2.63]
12.6
[0.50]
Port B
Port A
9/16 -18*
system pressure
gauge Port M1
Displacement
limiter
9/16 -18*
System pressure
gauge Port M2
92.2
[3.63]
96.5
[3.80]
80.5
[3.17]
101.57
[3.999]
P100 570E
39
520L0636 • Rev FD • August 2010
Series 40 Axial Piston Motors
Technical Information
Installation drawings
Dimensions in mm [in]
*All ports are SAE straight thread o-ring ports per SAE J514, unless otherwise specied.
Shaft rotation is determined by viewing motor from output shaft end.
Contact SAUER-DANFOSS Application Engineering for specic installation drawings.
M35/M44 MV:
MOUNTING FLANGE,
TRUNNION CONTROL
CW
CCW
125
[4.92]
111.8
[4.40]
70.4
[2.77]
Control trunnion
left side
option L
Control trunnion
right side
option R
87.25
[3.44]
73.03
[2.875]
45°
19.01 [0.750]
(2) places
19.84
[0 .781]
14.5 dia.
[0.562]
(2) places
P100 571E
Trunnion control
520L0636 • Rev FD • August 2010
40
Series 40 Axial Piston Motors
Technical Information
Installation drawings
*All ports are SAE straight thread o-ring ports per SAE J514, unless otherwise specied.
Shaft rotation is determined by viewing motor from output shaft end.
Contact SAUER-DANFOSS Application Engineering for specic installation drawings.
Dimensions in mm [in]
M46 MV: SIDE PORTS,
LOOP FLUSHING
Motor shaft direction Port A Port B
Clockwise (CW) Out In
Counterclockwise (CCW) In Out
72.6 min.
[2.86]
101.6 dia.
[4.000]
30 [1.18]
(2) places
228
[8.98]
139.6 [5.50]
(2) places
9.7 [0.38]
22.61 [0 .890]
63.5 [2.50]
(4) places
71.6 [2.82]
(4) places
1-5/16 - 12*
port B
82.6 [3.25]
(to L2)
1-5/16 - 12*
port A
200.5
[7.90]
Case outlet L2
(alternate)
X1
(ref.)
X2
(ref.)
case outlet L1
(opposite side)
1-1/16 - 12*
case outlets
ports L1 and L2
71.1 [2.80]
(2) places
74.7 [2.94]
(2) places
68.1 [2.68]
(to L1)
1-5/16 - 12*
Port B
1-5/16 - 12*
Port A
229.7
[9.04]
194.7
[7.66]
Loop flushing
shuttle valve
Loop flushing
relief valve
7/16 - 20*
gauge ports M1 and M2
98.3
[3.87]
80.9
[3.19]
68.8 [2.71]
(2) places
P100 572E
Radial (side) ports w/o loop flushing
Radial (side) ports w/ loop flushing
Flow direction
41
520L0636 • Rev FD • August 2010
Series 40 Axial Piston Motors
Technical Information
Installation drawings
Dimensions in mm [in]
*All ports are SAE straight thread o-ring ports per SAE J514, unless otherwise specied.
Shaft rotation is determined by viewing motor from output shaft end.
Contact SAUER-DANFOSS Application Engineering for specic installation drawings.
M46 MV: AXIAL PORTS,
LOOP FLUSHING
1-1/16 - 12*
port B
229.7
[9.04]
Loop flushing
shuttle valve
Loop flushing
relief valve
7/16 - 20*
gauge ports M1 and M2
98.3
[3.87]
80.9
[3.19]
71.6 [2.82]
(2) places
42.4 [1.67]
(2) places
1-1/16 - 12*
port A
63.5
[2.50]
89.7 [3.53]
w/o loop
flushing
P100 573E
Axial ports w/ loop flushing
520L0636 • Rev FD • August 2010
42
Series 40 Axial Piston Motors
Technical Information
Installation drawings
*All ports are SAE straight thread o-ring ports per SAE J514, unless otherwise specied.
Shaft rotation is determined by viewing motor from output shaft end.
Contact SAUER-DANFOSS Application Engineering for specic installation drawings.
Dimensions in mm [in]
M46 MV: SIDE PORTS,
THRU SHAFT TWIN
PORTS, LOOP FLUSHING
50.8
[2.00]
(2) places
1/2 - 13 Thd.
thru
(2) places
58.9
[2.32]
(2) places
50.813
[2.0005]
ø
ø
21.717 [0.8550]
21.1 [0.83] Full Spline
20.638 [0.8125] pitch dia.
30° pressure angle
13 teeth, 16/32 pitch
fillet root side fit
per ANSI B92.1, class no.5
(also mates with flat
root side fit)
25.4
[1.00]
7.7
[0.303]
40.0 [1.57] max.
37.3 [1.47]
1-1/16 - 12*
port B
68.5
[2.69]
1-1/16 - 12*
port A
29.7 [1.17]
(2) places
7/16 - 20*
gauge ports M1 and M2
229.7
[9.04]
Loop flushing
shuttle valve
98.3
[3.87]
Loop flushing
relief valve
13.49 dia. thru
[0.531]
(2) places
199.6
[7.86]
89.7 [3.53]
w/o loop
flushing
P100 574E
Side ports w/ thru shaft Radial (side) ported w/ loop flushing
w/ thru shaft
Radial (twin) ports w/ loop flushing
43
520L0636 • Rev FD • August 2010
Series 40 Axial Piston Motors
Technical Information
Installation drawings
Dimensions in mm [in]
*All ports are SAE straight thread o-ring ports per SAE J514, unless otherwise specied.
Shaft rotation is determined by viewing motor from output shaft end.
Contact SAUER-DANFOSS Application Engineering for specic installation drawings.
M46 MV: MOUNTING
FLANGE
82
[3.23]
14.27 dia. thru
[0.562]
(2) places
87.2
[3.44]
(2) places
115.1
[4.53]
73.7
[2.90]
73.02
[2.875]
(2) places
89.1
[3.51]
CW
CCW
P100 575E
520L0636 • Rev FD • August 2010
44
Series 40 Axial Piston Motors
Technical Information
Installation drawings
*All ports are SAE straight thread o-ring ports per SAE J514, unless otherwise specied.
Shaft rotation is determined by viewing motor from output shaft end.
Contact SAUER-DANFOSS Application Engineering for specic installation drawings.
Dimensions in mm [in]
M46 MV: CONTROL
PORTS
99.6 max.
[3.92]
104.1
[4.10]
100.6 max.
[3.96]
89.1
[3.51]
(ref)
80.5
[3.17]
Min. displacement
adjustment screw
(3/16 in.internal hex)
Max. displacement
adjustment screw
(screwdriver slot)
9/16 - 18*
Control pressure port X1
103.9
[4.09]
80.5
[3.17]
80.5
[3.17]
9/16 - 18*
Control pressure port X2
9/16 - 18*
Control pressure port X1
78.7
[3.10]
Both sides
78.7
[3.10]
P100 576E
Control w/ bottom pressure supply port and externally adjustable displacement limiters
Control w/ top and bottom pressure supply ports
45
520L0636 • Rev FD • August 2010
Series 40 Axial Piston Motors
Technical Information
Schematics
M25/M35/M44
FIXED MOTOR
SCHEMATICS
(NO LOOP FLUSHING)
M25/M35/M44
FIXED MOTOR
SCHEMATICS
M35/M44
VARIABLE MOTOR
SCHEMATICS
M46
VARIABLE MOTOR
SCHEMATICS
L1
M2
B
L2
M1
A
P100 579E
L1
M2
B
L2
M1
A
P100 580E
L1
M2
B
L2
M1
A
P100 581E
L1
L2
X1
M2
B
M1
A
X2
P100 582E
520L0636 • Rev FD • August 2010
46
Series 40 Axial Piston Motors
Technical Information
Notes
47
520L0636 • Rev FD • August 2010
Series 40 Axial Piston Motors
Technical Information
Notes
520L0636 • Rev FD • August 2010
Local address:
Sauer-Danfoss GmbH & Co. OHG
Postfach 2460, D-24531 Neumünster
Krokamp 35, D-24539 Neumünster, Germany
Phone: +49 4321 871 0
Fax: +49 4321 871 122
Sauer-Danfoss ApS
DK-6430 Nordborg, Denmark
Phone: +45 7488 4444
Fax: +45 7488 4400
Sauer-Danfoss is a global manufacturer and supplier of high-
quality hydraulic and electronic components. We specialize in
providing state-of-the-art technology and solutions that excel in
the harsh operating conditions of the mobile o -highway market.
Building on our extensive applications expertise, we work closely
with our customers to ensure exceptional performance for a broad
range of o -highway vehicles.
We help OEMs around the world speed up system development,
reduce costs and bring vehicles to market faster.
Sauer-Danfoss – Your Strongest Partner in Mobile Hydraulics.
Go to www.sauer-danfoss.com for further product information.
Wherever o -highway vehicles are at work, so is Sauer-Danfoss.
We o er expert worldwide support for our customers, ensuring
the best possible solutions for outstanding performance. And with
an extensive network of Global Service Partners, we also provide
comprehensive global service for all of our components.
Please contact the Sauer-Danfoss representative nearest you.
Products we o er:
• Bent Axis Motors
• Closed Circuit Axial Piston Pumps
and Motors
• Displays
• Electrohydraulic Power Steering
• Electrohydraulics
• Hydraulic Power Steering
• Integrated Systems
• Joysticks and Control Handles
• Microcontrollers and Software
• Open Circuit Axial Piston Pumps
• Orbital Motors
• PLUS+1™ GUIDE
• Proportional Valves
• Sensors
• Steering
• Transit Mixer Drives
Members of the Sauer-Danfoss Group:
Comatrol
www.comatrol.com
Schwarzmüller-Inverter
www.schwarzmueller-inverter.com
Turolla
www.turollaocg.com
Hydro-Gear
www.hydro-gear.com
Sauer-Danfoss-Daikin
www.sauer-danfoss-daikin.com
Sauer-Danfoss (US) Company
2800 East 13th Street
Ames, IA 50010, USA
Phone: +1 515 239 6000
Fax: +1 515 239 6618
Sauer-Danfoss-Daikin LTD.
Shin-Osaka TERASAKI 3rd Bldg. 6F
1-5-28 Nishimiyahara, Yodogawa-ku
Osaka 532-0004, Japan
Phone: +81 6 6395 6066
Fax: +81 6 6395 8585
www.sauer-danfoss.com