Danfoss Axial Piston Motors Data sheet
Data Sheet
Axial Piston Motors
L and K Frame
For more than 40 years, Danfoss has been developing
state-of-the-art components and systems for mobile
machinery used in off -highway operations around
the world. We have become a preferred supplier by
offering the best of what really matters: The hardware
inside your vehicle application.
The L/K motor is designed for use primarily in mobile
equipment using existing and proven technology.
These motors have been optimized with regard to
options, life, package size and installed cost.
The L/K motor family consists of five base
displacements which all fit in one package size. Two
different configurations are available, an SAE-B twobolt, or a cartridge style motor.
These motors are a two-position, variable
displacement, with smooth, shift-on-the-go
capability. The working displacement range of 3.4:1
with a minimum angle option to Zero degree
provides exceptional versatility in the application of
L/K motors. The motor is spring biased to maximum
displacement and can be hydraulically shifted to
minimum angle
Features
Wide range of options
•
Integral loop flush valve with relief plus
orifice
•
Minimum angle option to Zero degrees
•
Speed sensor with zero rpm and
direction sensing capability
•
Single and Two line control available for
SAE mount motors. Single line control
available for cartridge motors
•
Twin radial (side) or axial (end) porting
is available
•
Multiple minimum displacement
options available
•
Reduced maximum displacement
options
•
Tapered input shaft with shaft seal dust
protector for fan drive applications
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Danfoss | September 2017 L1003165 | AI00000330en-Us0202 | 1
Installation and Packaging benefits
•
SAE-B two-bolt, and cartridge mounting
•
Three clean sides with superior
clearance and access to mounting bolts
•
Short and compact: fits into wheel end
and compact installations with
improved porting
•
The cartridge motor fits through a 178
mm [7 Inch] mounting hole of a
gearbox pilot for subassembly
installation of motor to gearbox
•
High Efficiency - nine piston rotating
groups with an 18 degree maximum
angle
•
Low control pressure requirement (14
bar for servo) - no undue parasitic
power loss. Smooth two-speed shift
from minimum to maximum angle
Designed for Durability and Flexibility
•
Versatility - working displacement range
of 3.4:1 with a minimum angle option to
Zero degrees. SAE-B two-bolt, and
cartridge mounting available
•
Five displacements allow the optimum
selection of hydraulic motor for the
lowest possible installed cost
•
Reliability - uses existing technology
•
Suitable for closed and open circuit
applications
•
Designed for maximum system
pressures up to 420 bar [6100 psi]
Comprehensive technical literature is
online at powersolutions.danfoss.com
Cartridge motor schematic, single line control
SAE Motor schematic, two line control
A
B
Optional
X1
X2
L1
L2
Min.
Disp.
A
B
Optional
X1
L1
L2
L/K Cartridge Motor
L/K SAE Motor
Data Sheet
L and K Frame Motors
Technical specifications
Physical properties
Parameter Unit L25 L30 L35 K38 K45
Displacement
maximum
Weight (cartridge
and SAE-B)
Mass moment of
inertia of rotating
components
Theoretical torque
Operating parameters
Parameter Unit L25 L30 L35 K38 K45
System
pressure
Speed limit
(at max. disp)
Speed limit
(at min. disp)
Case pressure
Shift pressure
(single line
control)
1
2
1
Refer to bulletin 520L0627 for pressure definitions
Limit when motor angle is 12 degrees or less
Schematics
cm3 [in3] 25 [1.50] 30 [1.83] 35 [2.14] 38 [2.32] 45 [2.75]
kg [ lb] 15.4 [34]
kg•m2
[slug•ft2]
N•m/bar
[lbf•in/1000psi]
Maximum
operating
Maximum
Rated min-1 (rpm) 3400 3500 3600 3600 3500
Maximum 3950 4150 4300 4000 3900
Rated min-1 (rpm) 4400 4450 4500 4650 4500
2
Maximum 5000 5150 5300 5200 5050
Maximum
operating
Maximum 6 [87]
Maximum
operating
Maximum 69 [1000]
0.001666
[0.001229]
0.40
[244]
bar [psi]
bar [ psi] 2 [29]
bar [ psi] 14 [203]
400
[5800]
420
[6090]
0.001582
[0.001167]
0.48
[293]
350
[5075]
375
[5440]
0.001530
[0.001128]
0.56
[347]
300
[4350]
325
[4715]
0.002326
[0.001716]
0.60
[366]
350
[5075]
415
[6019]
0.002286
[0.001687]
0.72
[439]
300
[4350]
350
[5075]
2 | © Danfoss | September 2017 L1003165 | AI00000330en-Us0202
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