Danfoss Gear Motors User guide
Technical Information
Gear Motors
Group 1, 2, and 3
www.danfoss.com
Technical Information
G
ear Motors Group 1, 2, and 3
Revision history Table of revisions
Date Changed Rev
July 2021 Minor corrections to data made 0102
October 2019 First edition 0101
2 | © Danfoss | July 2021 BC319483612502en-000102
Technical Information
G
ear Motors Group 1, 2, and 3
Contents
General information
Overview..............................................................................................................................................................................................
Features and benefits..................................................................................................................................................................... 7
Motor displacements...................................................................................................................................................................... 7
Determination of nominal motor size.......................................................................................................................................8
System Requirements
Pressure................................................................................................................................................................................................9
Speed....................................................................................................................................................................................................9
Hydraulic Fluids.............................................................................................................................................................................. 10
Temperature and Viscosity.........................................................................................................................................................10
Filtration............................................................................................................................................................................................ 11
Line sizing-x..................................................................................................................................................................................... 12
Motor shaft connection............................................................................................................................................................... 12
Motor shaft load data form........................................................................................................................................................ 13
Motor Life..........................................................................................................................................................................................13
Group 1 Gear motors
Motor design................................................................................................................................................................................... 14
Technical data................................................................................................................................................................................. 15
Model code.......................................................................................................................................................................................15
Motor performance graphs........................................................................................................................................................19
Flange, shaft and port configurations....................................................................................................................................22
Shaft options....................................................................................................................................................................................22
Integral relief value - SKM1IN.....................................................................................................................................................23
Ports dimensions............................................................................................................................................................................26
Dimensions.......................................................................................................................................................................................27
Group 2 Gear motors
Motor design................................................................................................................................................................................... 31
Technical data................................................................................................................................................................................. 32
Model code.......................................................................................................................................................................................33
5
Filters.............................................................................................................................................................................................11
Selecting a filter.........................................................................................................................................................................11
Reservoir...................................................................................................................................................................................... 11
A Family........................................................................................................................................................................................15
B Displacement..........................................................................................................................................................................16
C Rotation....................................................................................................................................................................................16
D Project version ......................................................................................................................................................................16
E Mounting flange....................................................................................................................................................................16
F Drive Gear................................................................................................................................................................................ 16
G Rear cover................................................................................................................................................................................17
H Inlet size; I Outlet size..........................................................................................................................................................17
J Ports Pos & Spec Body..........................................................................................................................................................18
K Seals........................................................................................................................................................................................... 18
L Screws........................................................................................................................................................................................18
M Set valves................................................................................................................................................................................ 18
N Type of mark...........................................................................................................................................................................19
O Mark position.........................................................................................................................................................................19
Variant codes for ordering intergral relief valve............................................................................................................24
SKM1NN, SKU1NN, SNU1NN – 01BA..................................................................................................................................28
SKM1NN, SKU1NN – 02BB, 02FA......................................................................................................................................... 29
SKM1NN, SKU1NN – 06GA and 06SA.................................................................................................................................30
SNM2NN.......................................................................................................................................................................................31
SNU2NN....................................................................................................................................................................................... 31
SKU2NN........................................................................................................................................................................................32
A Family........................................................................................................................................................................................33
B Displacement..........................................................................................................................................................................34
C Rotation....................................................................................................................................................................................34
D Project version ......................................................................................................................................................................35
E Mounting flange....................................................................................................................................................................35
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Danfoss | July 2021 BC319483612502en-000102 | 3
Technical Information
G
ear Motors Group 1, 2, and 3
Contents
Motor performance graphs........................................................................................................................................................40
Flange, shaft and port configurations....................................................................................................................................42
Shaft options....................................................................................................................................................................................43
Port dimensions..............................................................................................................................................................................44
Integral relief valve - SNM2IN.................................................................................................................................................... 46
Anti-cavitation check valve - SNM2GN...................................................................................................................................49
Integral relief valve and anti-cavitation check valve - SNM2JN.................................................................................... 49
Outrigger bearing assembly - SNM2NN................................................................................................................................ 50
Dimensions.......................................................................................................................................................................................55
Group 3 Gear motors
Motor design................................................................................................................................................................................... 60
Technical data................................................................................................................................................................................. 61
Model code.......................................................................................................................................................................................62
Motor performance graphs........................................................................................................................................................67
Flange, shaft, and port configurations...................................................................................................................................70
Shaft and flange availability.......................................................................................................................................................71
Ports dimensions............................................................................................................................................................................72
Anti-cavitation check valve - SNM3GN...................................................................................................................................75
Dimensions.......................................................................................................................................................................................76
F Drive gear.................................................................................................................................................................................35
G Rear cover................................................................................................................................................................................
H Inlet size; I Outlet size..........................................................................................................................................................37
J Ports pos & Spec body......................................................................................................................................................... 38
K Seals........................................................................................................................................................................................... 38
L Screws........................................................................................................................................................................................38
M Set valves................................................................................................................................................................................ 38
N Type of mark...........................................................................................................................................................................39
O Mark position.........................................................................................................................................................................39
Variant codes for ordering intergral relief valve............................................................................................................47
Allowable shaft loads.............................................................................................................................................................. 51
Outrigger bearings 9A, 94, 9J, 9F, and 9H .......................................................................................................................53
Dimensions............................................................................................................................................................................54
SNM2NN, SNU2NN – 01DA, 01FA and 01BA...................................................................................................................55
SNM2NN, SNU2NN – 02DB and 02AA............................................................................................................................... 56
SNM2NN, SNU2NN – 03CA....................................................................................................................................................57
SNM2NN, SNU2NN–04DB/05DB and 04AA/05AA........................................................................................................ 58
SNM2NN, SNU2NN, SKU2NN – 06SA, 06GA.................................................................................................................... 59
SNM3NN.......................................................................................................................................................................................60
SNU3NN....................................................................................................................................................................................... 61
A Family........................................................................................................................................................................................62
B Displacement..........................................................................................................................................................................63
C Rotation....................................................................................................................................................................................63
D Project version (value representing a change to the initial project)................................................................. 63
E Mounting flange....................................................................................................................................................................63
F Drive Gear................................................................................................................................................................................ 64
G Rear Cover...............................................................................................................................................................................64
H Inlet size; I Outlet size..........................................................................................................................................................64
J Ports pos & Spec body......................................................................................................................................................... 65
K Seals........................................................................................................................................................................................... 66
L Screws........................................................................................................................................................................................66
M Set valves................................................................................................................................................................................ 66
N Type of mark...........................................................................................................................................................................66
O Mark position.........................................................................................................................................................................66
SNM3NN, SNU3NN – 01FA, 01DA and 01BA...................................................................................................................76
SNM3NN, SNU3NN – 02FA, 02DB and 02AA...................................................................................................................77
SNM3NN, SNU3NN – 03FB and 03BB.................................................................................................................................78
SNM3NN, SNU3NN – 06AA....................................................................................................................................................79
SNM3NN, SNU3NN – 07BC, 07SA and 07GA................................................................................................................... 80
36
4 | © Danfoss | July 2021 BC319483612502en-000102
Technical Information
G
ear Motors Group 1, 2, and 3
General information
Overview
The DanfossGear Motors is a range of peak performance fixed displacement hydraulic motors available in
three different frame sizes: Group 1, Group 2, and Group 3, all as uni- and bidirectional version.
Constructed of a high strength extruded aluminum body with aluminum rear cover and aluminum front
flange, all motors are balanced for exceptional efficiency and designed to ensure an excellent starting
torque and, in the bidirectional version, to guarantee the ability to work with high back pressure and
extremely low system pressure.
The flexibility of the range in each frame size combined with the high efficiency and low starting torque
makes the Danfoss Gear Motors ideal for a wide range of applications sectors including on- and offhighway hydraulic fan drive systems, turf care, road bildge, fork lifts and municipal.
All the unidirectional motors have the same construction of the correspondent pump as well but, with
inlet and outlet positioned at the opposite side for the same rotation.
Some representatives of gear motors
SKM1NN 06SA
SNM2NN9JDB
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Danfoss | July 2021 BC319483612502en-000102 | 5
Technical Information
G
ear Motors Group 1, 2, and 3
General information
SNM3NN01BA
SNU2NN 06SA
SNM3NL 07SA
6 | © Danfoss | July 2021 BC319483612502en-000102
300
250
200
150
100
50
0
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95
SKU1NN
SNU1NN
SKU2NN
SNU2NN
SNU3NN
Rated pressure
bar
Displacement cm3/rev
Technical Information
G
ear Motors Group 1, 2, and 3
General information
SNU2NN 06GB
Features and benefits
•
•
•
•
•
•
•
•
Three groups of frame sizes (Group 1, 2 and 3)
Displacements from 2.6 to 90 cm3/rev [from 0.158 to 5.49 in3/rev]
Available in uni- and bidirectional version for all the frame sizes, displacements and configurations
Rated pressure up to 250 bar [3625 psi]
Back pressure capability up to 250 bar [3625 psi]
Speeds up to 4000 min-1 (rpm) for Group 1 and 2, and up to 2500 min-1 (rpm) for Group 3
SAE, ISO and DIN mounting flanges and shafts
Available with integrated relief valve in the Group 2 frame size and integrated anti-cavitation valve in
Group 2 and Group 3 frame sizes
Motor displacements
Quick reference chart for unidirectional motor models (Group 1, 2 and 3)
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Danfoss | July 2021 BC319483612502en-000102 | 7
300
250
200
150
100
50
0
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95
Displacement cm3/rev
SKM1NN
SNM2NN
SNM3NN
Rated pressure bar
Vg • n
1000 •
v
Qe =
Vg • p •
mh
20 •
Me =
Qe • p •
t
600
=
Me • n
9550
Pe=
n =
Qe • 1000 •
v
V
g
Vg • n
231 •
v
Qe =
Vg • p •
mh
2 •
Me =
Vg • n • p •
t
396 000
Pe=
n =
Qe • 231 •
v
V
g
Technical Information
G
ear Motors Group 1, 2, and 3
General information
Quick reference chart for bidirectional motor models (Group 1, 2 and 3)
Determination of nominal motor size
Based on SI units Based on US units
Where:
Q
Input flow (l/min)
e
M
Output torque (N•m)
e
P
Output power (kW)
e
n Speed (min-1)
V
Motor displacement per rev. (cm3/rev)
g
p
High pressure (bar)
high
p
Low pressure (bar)
low
∆p High pressure minus Low pressure (bar)
η
Motor volumetric efficiency
v
η
Mechanical-hydraulic efficiency
mh
η
Motor total efficiency (ηv • ηmh)
t
Where:
Q
Input flow [US gal/min]
e
M
Output torque [lb•in]
e
P
Output power [hp]
e
n Speed [rpm]
V
Motor displacement per rev. [in3/rev]
g
p
High pressure [psi]
high
p
Low pressure [psi]
low
∆p High pressure minus Low pressure [psi]
η
Motor volumetric efficiency
v
η
Mechanical-hydraulic efficiency
mh
η
Motor total efficiency (ηv • ηmh)
t
8 | © Danfoss | July 2021 BC319483612502en-000102
Peak pressure
Rated pressure
Reaction time (100 ms max)
Time
Pressure
Technical Information
G
ear Motors Group 1, 2, and 3
System Requirements
Pressure
Peak pressure is the highest intermittent pressure allowed.
The relief valve overshoot (reaction time) determines peak pressure. It is assumed to occur for less than
100 ms.
The illustration to the right shows peak pressure in relation to rated pressure and reaction time (100 ms
maximum).
Rated pressure is the average, regularly occurring operating inlet pressure that should yield satisfactory
product life. The maximum machine load at the motor shaft determines rated pressure
Speed
System pressure is the differential between the inlet and outlet ports. It is a dominant operating variable
affecting hydraulic unit life. High system pressure, resulting from high load at the motor shaft, reduces
expected life. System pressure must remain at, or below, rated pressure during normal operation to
achieve expected life.
Back pressure is the average, regularly occurring operating outlet pressure that should yield satisfactory
bidirectional motor life. The hydraulic load demand downstream of the motor determines the back
pressure. Unidirectional motors cannot work with back pressure and the maximum back pressure
allowed is 5 bar [72 psi] rated and 7 bar [101 psi ] as peak.
Case Drain Pressure is the regularly occurring case drain line pressure that should yield satisfactory
bidirectional motor life. It is recommended to design the case drain piping connecting the case drain
direct to the tank in order to keep the case drain pressure as low as possible. The max. continuous case
drain pressure allowed is 5 bar [72 psi] rated and 7 bar [101 psi] as peak.
Maximum speed is the limit recommended by Danfoss for a particular gear motor when operating at
rated pressure. It is the highest speed at which normal life can be expected.
The lower limit of operating speed is the minimum speed. It is the lowest speed at which normal life can
be expected.
The minimum speed increases as operating system pressure increases. When operating under higher
pressures, a higher minimum speed must be maintained, as illustrated below.
©
Danfoss | July 2021 BC319483612502en-000102 | 9
Rated
P
1
Pressure
0
N MaxN
2
Speed
Operating
envelope
1
C
Technical Information
G
ear Motors Group 1, 2, and 3
System Requirements
Speed versus pressure
Where:
N1 = Minimum speed at 100 bar
N2 = Minimum speed at rated pressure
Hydraulic Fluids
Temperature and Viscosity
Ratings and data for gear motors are guaranteed when the hydraulic system operates with premium
hydraulic fluids without containing oxidation, rust, or foam inhibitors.
These fluids have to work with good thermal and hydrolytic stability to prevent wear, erosion, or
corrosion of internal components. They include:
•
Hydraulic fluids following DIN 51524, part 2 (HLP) and part 3 (HVLP) specifications
•
API CD engine oils conforming to SAE J183
•
M2C33F or G automatic transmission fluids
•
Certain agricultural tractor fluids
Caution
Use only clean fluid in the gear motors and hydraulic circuit. Never mix hydraulic fluids.
Temperature and viscosity requirements must be concurrently met. Use of petroleum/mineral-based
fluids is highly recommended.
High temperature limits apply at the inlet port of the motors. The motors should operate at or below the
maximum continuous temperature. The peak temperature is based on material properties.
Don’t exceed it.
Minimum (cold start) temperature relates to the physical properties of component materials.
Cold oil, generally, doesn’t affect the durability of motors components. It may affect the ability of oil to
10 | © Danfoss | July 2021 BC319483612502en-000102
flow and transmit power. For this reason, keep the temperature at 16°C [60 °F] above the pour point of
the hydraulic fluid.
Technical Information
G
ear Motors Group 1, 2, and 3
System Requirements
Temperature limits (with standard NBR seals)
Minimum viscosity occurs only during brief occasions of maximum ambient temperature and severe
duty cycle operation.
Maximum viscosity occurs at cold start only. During this condition, limit speeds until the system warms
up.
•
•
•
Fluid viscosity limits, in mm2/s [SUS]
Minimum (cold start) Maximum continuous Peak (intermittent)
-20°C [-4°F] 80°C [176°F] 90°C [194°F]
Size heat exchangers to keep the fluid within these limits
Test regularly to verify that these temperatures and viscosity limits aren’t exceeded
Keep the fluid viscosity in the recommended viscosity range for maximum unit efficiency and bearing
life
Maximum (cold start) Recommended range Range for high efficiency Minimum
1600 [7273] 12-100 [66-456] 20-50 [97-231] 10 [60]
Filtration
Filters
Use a filter that conforms to Class 22/18/13 of ISO 4406 (or better). It may be on the motor outlet
(discharge filtration) or inlet (pressure filtration).
Selecting a filter
When selecting a filter, please consider:
•
Contaminant ingression rate (determined by factors such as the number of actuators used in the
system)
•
Generation of contaminants in the system
•
Required fluid cleanliness
•
Desired maintenance interval
•
Filtration requirements of other system components
Measure filter efficiency with a Beta ratio (βX). βx ratio is a measure of filter efficiency defined by ISO 4572.
It is the ratio of the number of particles greater than a given diameter (in microns) upstream of the filter
to the number of these particles downstream of the filter.
•
For discharge filtration with controlled reservoir ingression, use a β
•
For pressure filtration, use a filtration with an efficiency of β10 = 75
The filtration requirements for each system are unique. Evaluate filtration system capacity by monitoring
and testing prototypes.
Fluid cleanliness level and βX ratio
Fluid cleanliness level (per ISO 4406)
βX ratio (discharge filtration)
βX ratio (pressure or return filtration)
Recommended inlet screen size
Class 22/18/13 or better
β
= 75 and β10 = 2
35-45
β10 = 75
100 – 125 μm [0.004 – 0.005 in]
35-45
= 75 filter
Reservoir
The reservoir provides clean fluid, dissipates heat, removes entrained air, and allows fluid volume
changes associated with fluid expansion and cylinder differential volumes. A correctly sized reservoir
©
Danfoss | July 2021 BC319483612502en-000102 | 11
Pilot cavity
Ø 0.1 [0.004]
Mating spline
Technical Information
G
ear Motors Group 1, 2, and 3
System Requirements
accommodates maximum volume changes during all system operating modes. It promotes de-aeration
of the fluid as it passes through, and accommodates a fluid dwell-time between 60 and 180 seconds,
allowing entrained air to escape.
Minimum reservoir capacity depends on the volume required to cool and hold the oil from all retracted
cylinders, allowing for expansion due to temperature changes. A fluid volume of 1 to 3 times the pump
output flow (per minute) is satisfactory. The minimum reservoir capacity is 125% of the fluid volume.
Install the suction line above the bottom of the reservoir to take advantage of gravity separation and
prevent large foreign particles from entering the line. Cover the line with a 100-125 micron screen. The
pump should be below the lowest expected fluid level.
Put the return-line below the lowest expected fluid level to allow discharge into the reservoir for
maximum dwell and efficient deaeration. A baffle (or baffles) between the return and suction lines
promotes deaeration and reduces fluid surges.
Line sizing-x
Choose pipe sizes that accommodate minimum fluid velocity to reduce system noise, pressure drops, and
overheating. This maximizes system life and performance.
Design inlet piping that maintains continuous pump inlet pressure above 0.8 bar absolute during normal
operation. The line velocity should not exceed the values in the table below:
Motor shaft connection
Maximum line speed
Inlet Outlet Return
5 m/s [16.4 ft/sec] 2.5 m/s [8.2 ft/sec] 3 m/s [9.8 ft/sec]
Most systems use hydraulic oil containing 10% dissolved air by volume.
Over-aeration, or entrained air is the result of flow line restrictions, where the dissolved air comes out
of solutions, or when air is allowed to leak into the hydraulic circuit. These include inadequate pipes size,
sharp bends, or elbow fittings causing a reduction of flow-line cross-sectional area. This problem will not
occur if these circuit recommendations are followed, rated speed requirements are maintained, and
reservoir size and location are adequate.
Shaft options for gear motors include tapered, splined, and parallel shafts.
Plug-in drives, with a splined shaft, can impose severe radial loads when the mating spline is rigidly
supported. Increasing spline clearance does not alleviate this condition.
Use plug-in drives only if the concentricity between the mating spline and pilot diameter is within 0.1
mm [0.004 in]. Lubricate the drive by flooding with oil. A three-piece coupling minimizes radial or thrust
shaft loads.
Motor shaft connection
12 | © Danfoss | July 2021 BC319483612502en-000102
a
90
o
α
0
o
270
o
180
o
Inlet port
Axial load
(A
L
)
Radial load (RL)
RL
Technical Information
G
ear Motors Group 1, 2, and 3
System Requirements
To avoid spline shaft damage, use carburized and hardened steel couplings with 80-82 HRA surface
hardness.
Motor shaft load data form
Photocopy this page and fax the complete form to your Danfoss representative for an assistance. This
illustration shows a motor with counterclockwise orientation:
Motor Life
Application data
Item Value Based on SI or US units
Motor displacement □ cm3/rev □ in3/rev
Rated system pressure □ bar □ psi
Peak pressure
Motor shaft rotation □ left □ right
Motor minimum speed
Motor maximum speed
Radial load R
Angular orientation of radial load to inlet port α degree
Axial load A
Distance from flange to radial load a □ mm □ in
1
1
min-1 (rpm)
□ N □ lbf
□ N □ lbf
Motor life is a function of speed, system pressure, and other system parameters (such as fluid quality and
cleanliness).
All Danfoss gear motors use hydrodynamic journal bearings that have an oil film maintained between the
gear/shaft and bearing surfaces at all times. If the oil film is sufficiently sustained through proper system
maintenance and operating within recommended limits, long life can be expected.
High pressure impacts motor life. When submitting an application for review, provide machine duty cycle
data that includes percentages of time at various loads and speeds.
B10 life expectancy number is generally associated with rolling element bearings. It does not exist for
hydrodynamic bearings.
Danfoss strongly recommends a prototype testing program to verify operating parameters and their
impact on life expectancy before finalizing any system design.
©
Danfoss | July 2021 BC319483612502en-000102 | 13
Technical Information
G
ear Motors Group 1, 2, and 3
Group 1 Gear motors
Motor design
SKM1NN
SKM1NN is the Group 1 bidirectional motor available in the whole displacements range from 2.6 up to 12
cm3/rev [from 0.158 up to 0.732 in3/ rev].
Configurations include European and SAE flanges and shafts (Code 01BA, 02BB, 02FA, 06GA, 06SA).
SKM1NN 06SA
SKU1NN
SKU1NN is a Group 1 unidirectional motor available in the whole displacements range from 2.6 up to 12
cm3/rev [from 0.158 up to 0.732 in3/rev]. The SKU1NN motor construction is derived from the
correspondent pump SKP1NN.
Configurations include European and SAE flanges and shafts (Code 01BA, 02BB, 02FA, 06GA, 06SA).
SNU1NN
SNU1NN is a Group 1 unidirectional motor available in a limited displacements range from 2.6 up to 7.8
cm3/rev [from 0.158 up to 0.464 in3/rev]. The SNU1NN motor construction is derived from the
correspondent pump SNP1NN. Configurations include European flange and shaft (Code 01BA).
SNU1NN 01BA (cut-away)
14 | © Danfoss | July 2021 BC319483612502en-000102
C
Technical Information
G
ear Motors Group 1, 2, and 3
Group 1 Gear motors
Technical data
Displacement cm3/rev [in3/rev]
SKM1NN (a standard, bidirectional motor)
Peak pressure
Rated pressure
Back pressure
Minimum speed min-1 (rpm) 1000 1000 1000 800 800 800 800 800
Maximum speed 4000 4000 3000 3000 2000 2000 2000 2000
SKU1NN (a standard, unidirectional motor)
Peak pressure
Rated pressure
Minimum speed min-1 (rpm) 1000 1000 1000 800 800 800 800 800
Maximum speed 4000 4000 3000 3000 2000 2000 2000 2000
SNU1NN (a standard, unidirectional motor)
Peak pressure
Rated pressure
Minimum speed min-1 (rpm) 1000 1000 1000 800 800 800
Maximum speed 4000 4000 3000 3000 2000 2000
All
Weight kg [lb]
Moment of inertia of rotating
components
Frame size
2,6 3,2 3,8 4,3 6,0 7,8 010 012
2.62
[0.158]
bar [psi] 270
[3915]
250
[3625]
250
[3625]
bar [psi] 270
[3915]
250
[3625]
bar [psi] 270
[3915]
250
[3625]
1.02
[2.26]
x 10-6 kg•m2
[x 10-6 lbf•ft2]
5.1
[121.0]
3.14
[0.195]
270
[3915]
250
[3625]
250
[3625]
270
[3915]
250
[3625]
270
[3915]
250
[3625]
1.14
[2.51]
5.7
[135.2]
3.66
[0.231]
270
[3915]
250
[3625]
250
[3625]
270
[3915]
250
[3625]
270
[3915]
250
[3625]
1.18
[2.60]
6.4
[151.9]
4.19
[0.262]
270
[3915]
250
[3625]
250
[3625]
270
[3915]
250
[3625]
270
[3915]
250
[3625]
1.20
[2.65]
7.1
[168.5]
5.89
[0.366]
250
[3625]
230
[3335]
230
[3335]
250
[3625]
230
[3335]
190
[2755]
170
[2465]
1.30
[2.87]
9.3
[220.7]
7.59
[0.463]
220
[3190]
200
[2900]
200
[2900]
220
[3190]
200
[2900]
180
[2610]
160
[2320]
1.39
[3.06]
11.4
[270.5]
9.94
[0.607]12[0.732]
180
150
[2610]
[2175]
160
130
[2320]
[1895]
160
130
[2320]
[1895]
170
140
[2465]
[2030]
150
120
[2175]
[1740]
–
1.55
1.65
[3.42]
[3.64]
14.6
17.1
[339.4]
[405.8]
1 kg•m2 = 23.68 lb•ft
2
Caution
The rated and peak pressure mentioned are for motors with flanged ports only. When threaded ports are
required a derated performance has to be considered. To verify the compliance of an high pressure
application with a threaded ports pump apply to a Danfoss representative.
Model code
A Family
A B C D E F G H I J K L M N O
● ● ● ● ● ● /
©
Danfoss | July 2021 BC319483612502en-000102 | 15
Technical Information
G
ear Motors Group 1, 2, and 3
Group 1 Gear motors
SNU1NN
SKU1NN
SKM1NN
SKM1IN
Unidirectional gear motor
High torque unidirectional gear motor
Bidirectional gear motor
Bidirectional gear motor with relief valve
B Displacement
A B C D E F G H I J K L M N O
2,6
3,2
3,8
4,3
6,0
7,8
010
012
2.62 cc
3.14 cc
3.66 cc
4.19 cc
5.89 cc
7.59 cc
9.94 cc
12.0 cc
C Rotation
A B C D E F G H I J K L M N O
● ● ● /
● /
L
R
B
Left (Counterclockwise)
Right (Clockwise)
Bidirectional
D Project version
A B C D E F G H I J K L M N O
N
Std Version of Project
E Mounting flange
A B C D E F G H I J K L M N O
01
02
06
European 4 bolt flange with pilot Ø25,4 mm
European 4 bolt flange with pilot Ø30 mm
SAE A-A 2 bolt flange with pilot Ø50,8 mm
F Drive Gear
A B C D E F G H I J K L M N O
● /
● ● /
● ● /
16 | © Danfoss | July 2021 BC319483612502en-000102
Technical Information
G
ear Motors Group 1, 2, and 3
Group 1 Gear motors
BA
BB
FA
GA
SA
G Rear cover
A B C D E F G H I J K L M N O
P1
M1
M2
M3
M6
MH
I1
L6
V1
Taper 1:8-M7-Key2,41 SKP1
Taper 1:8-M10x1-Key 3
Parallel Ø12-Thread M10x1-Key 3
Parallel Ø12,7-Key 3,2
SAE spline J498-9T-20/40 Flat Root Side FIT-L15
● ● /
Standard cover for unidirectional motors
Standard cover for motors drain M12x1,5
Cover with drain 1/8" Gas
Cover with drain 1/4" Gas
Cover with drain 7/16-20UNF-2B
Cover with drain M12x1,5 ISO6149
Cover for unidirectional motors with relief valve
Cover motor with side drain in vertical axis 7/16-20UNF-2B
Cover for bidirectional motors with relief valve with drain 1/4 Gas
H Inlet size; I Outlet size
A B C D E F G H I J K L M N O
B2
C1
C2
C3
D3
D5
D7
13x30xM6
8x26xM5
12x26xM5
13,5x30xM6
M14x1,5
M18x1,5
M22x1,5
● ● ● ● /
©
Danfoss | July 2021 BC319483612502en-000102 | 17
Technical Information
G
ear Motors Group 1, 2, and 3
Group 1 Gear motors
E3
E4
E5
F2
F3
F4
H2
H4
H5
H7
9/16-18UNF
3/4-16UNF
7/8-14UNF
1/4 GAS
3/8 GAS
1/2 GAS
10xM12x1,5-ISO6149
12xM16x1,5-ISO6149
12xM18x1,5-ISO6149
13,5xM22x1, 5-ISO6149
J Ports Pos & Spec Body
A B C D E F G H I J K L M N O
● ● /
N
Std from catalog
K Seals
A B C D E F G H I J K L M N O
N
H
Standard NBR seal
VITONseals + special backing ring - special for SKU1NN
L Screws
A B C D E F G H I J K L M N O
N
B
Std screws
GEOMET screws - Anticorrosion screws
M Set valves
A B C D E F G H I J K L M N O
NNN
*
V
*
For details, see Variant codes for ordering intergral relief valve on page 24.
No valve
Integralrelief valve pressure setting
● /
● /
/ ● ● ●
18 | © Danfoss | July 2021 BC319483612502en-000102
Technical Information
G
ear Motors Group 1, 2, and 3
Group 1 Gear motors
N Type of mark
A B C D E F G H I J K L M N O
/ ●
Motor performance graphs
N
A
Z
Standard Danfoss Marking
Standard Danfoss Marking+Customer Code-Special
Without Marking
O Mark position
A B C D E F G H I J K L M N O
/ ●
N
A
Std Marking position (on top)
Special Marking position on the bottom
The following graphs provide typical inlet flow and output torque for Group 1 motors at various working
pressures. Data were taken using ISO VG46 petroleum /mineral based fluid at 50 °C [122 °F] (viscosity = 28
mm2/s [132 SUS]).
©
Danfoss | July 2021 BC319483612502en-000102 | 19
Technical Information
G
ear Motors Group 1, 2, and 3
Group 1 Gear motors
20 | © Danfoss | July 2021 BC319483612502en-000102
Technical Information
G
ear Motors Group 1, 2, and 3
Group 1 Gear motors
©
Danfoss | July 2021 BC319483612502en-000102 | 21
Technical Information
G
ear Motors Group 1, 2, and 3
Group 1 Gear motors
Flange, shaft and port configurations
...For SKM1NN and SKU1NN
Code Flange Shaft Port
01BA European 01, 4-
bolts pilot Ø
25.4 mm [1.0 in]
Taper 1:8
European in
+ pattern
02BB European 02, 4-
bolts pilot Ø 30
mm [1.181]
02FA European 02, 4-
bolts pilot Ø 30
mm [1.181]
06GA
SAE A-A 2-bolts Parallel
06SA SAE A-A 2-bolts
Taper 1:8 German
Parallel
12 mm [0.472 in]
12.7 mm [0.5 in]
SAE A-A
9-teeth splined
standard in X
pattern
European in
+ pattern
Threaded
SAE O-ring
boss
Threaded
SAE O-ring
boss
...For SNU1NN
Code Flange Shaft Port
01BA
European 01, 4bolts pilot Ø
25.4 mm [1.0 in]
Taper 1:8
European in
+ pattern
Shaft options
Group 1 motors are available with a variety of splined, parallel, and tapered shaft ends. Not all shaft styles
are available with all flange styles.
A B C D E F G H I J K L M N O
● ● /
22 | © Danfoss | July 2021 BC319483612502en-000102
C
Technical Information
G
ear Motors Group 1, 2, and 3
Group 1 Gear motors
Shaft Mounting flange code with maximum torque
Code Description 01 02 06
BA
BB
DB
FA
GA
SA
Recommended mating splines for Group 1 splined output shafts should be in accordance with SAE J498
or DIN 5482. Danfoss external SAE splines are flat root side fit with circular tooth thickness reduced by
0.127 mm [0.005 in] in respect to class 1 fit. The external DIN splines have an offset increased by 0.1 mm
[0.004 in]. These dimensions are modified in order to assure a clearance fit with the mating spline.
Other shaft options may exist. Contact your Danfoss representative for availability.
Taper 1:8 25 [221] - -
Taper 1:8 - 50 [442] -
Splined Z15-m0,75-alfa 30°-L14 - 35 [309] -
Parallel 12 mm [0.47 in] - 24 [212] -
Parallel 12.7 mm [0.50 in] - - 32 [283]
SAE spline J 498-9T-20/40DP - - 34 [301]
Caution
Integral relief value - SKM1IN
Shaft torque capability may limit allowable pressure. Torque ratings assume no external radial loading.
Applied torque must not exceed these limits, regardless of stated pressure parameters. Maximum torque
ratings are based on shaft torsional fatigue strength.
Danfoss offers an optional integral relief valve integrated in the Group 1 motors rear cover. It is drained
internally and directs all the flow from the motor inlet to the outlet when the inlet pressure reaches the
valve setting.
The tables below show applicable variant codes for ordering motors with integral relief valve. Refer to
Model code on page 15 for more information.
Valve schematic diagram
©
Danfoss | July 2021 BC319483612502en-000102 | 23
Inlet
Drain
P101 016
bar
0
[1000]
[2000]
[3000]
[4000]
[5000]
[psi]
l/min
0
[US gal/min]
0
100
200
300
400
With mineral oil at 26 mm2/s
10 3020 40
[10][2] [4]
[6] [8]
MINIMUM VALVE SETTING
Technical Information
G
ear Motors Group 1, 2, and 3
Group 1 Gear motors
Integral relief valve rear cover cross section
Pressure vs flow
Variant codes for ordering intergral relief valve
Variant codes for ordering integral relief valve
A B C D E F G H I J K L M N O
/ V ● ●
M Variant code (left part)
Code
A
C
E
F
G
K
I
L
M
24 | © Danfoss | July 2021 BC319483612502en-000102
Motor speed for RV setting
min-1 (rpm)
not defined
500
1000
1250
1500
2000
2250
2500
2800
Technical Information
G
ear Motors Group 1, 2, and 3
Group 1 Gear motors
M Variant code (left part) (continued)
Code
N
O
M Variant code (right part)
Code
A
B
C
D
E
F
G
J
K
L
M
N
O
P
Q
R
S
T
U
V
W
X
Z
Motor speed for RV setting
min-1 (rpm)
3000
3250
Pressure setting bar
[psi]
no setting
no valve
18 [261]
25 [363]
30 [435]
35 [508]
40 [580]
150 [2175]
50 [725]
60 [870]
70 [1015]
80 [1160]
90 [1305]
100 [1450]
110 [1595]
120 [1740]
130 [1885]
140 [2030]
160 [2321]
170 [2466]
180 [2611]
210 [3046]
250 [3626]
©
Danfoss | July 2021 BC319483612502en-000102 | 25
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