Danfoss K Frame Series, Service Manual

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Overview
Specifications and operating parameters for KC/LC motors are given here for reference.
Features and options
Mount
SAE-B (LV/KV) Cartridge (LC/KC)
Motor type
Inline, axial piston, positive displacement, two-speed variable motors
Displacement
L: 25, 30, or 35 cm
3
[1.50, 1.83, or 2.14 in
3
] K: 38 or 45 cm
3
[2.32 or 2.75 in
3
]
Rotation
Bidirectional
Installation position
Discretionary: Housing must always be filled with hydraulic fluid
Porting
SAE O-ring boss, axial or twin radial SAE O-ring boss, twin radial
Output shafts
Splined 13 or 15 tooth 16/32 pitch, 0.875 in. straight
keyed, and 1:8 taper Splined 13 or 15 tooth 16/32 pitch
Control options
Single or dual line hydraulic control Single line hydraulic control
Displacement limiter
Fixed maximum and minimum displacement limiters available
Speed sensor
Available on L Frame SAE-B motors, in development* on K frame and cartridge motors
Loop Flushing Valve
Available
Specifications
Parameter Unit L25 L30 L35 K38 K45
Displacement (maximum) cm
3
[in
3
] 25 [1.50] 30 [1.83] 35 [2.14] 38 [2.32] 45 [2.75]
Weight (cartridge and SAE-B) kg [lb] 15.4 [34]
Mass moment of inertia of rotating
components kg•m
2
[slug•ft
2
]
0.001666
[0.001229] 0.001582
[0.001167] 0.001530
[0.001128] 0.002326
[0.001716] 0.002286
[0.001687]
Theoretical torque N•m/bar
[lbf•in/1000psi] 0.40
[244] 0.48
[293] 0.56
[347] 0.60
[366] 0.72
[439]
Operating parameters
Parameter Unit L25 L30 L35 K38 K45
System pressure continuous bar [psi] 210 [3045] 175 [2540] 140 [2030] 210 [3045] 175 [2540]
maximum 415 [6020] 350 [5075] 280 [4060] 415 [6020] 350 [5075]
Speed limit
(at max. disp) continuous min
-1
(rpm) 3400 3500 3600 3600 3500
maximum 3950 4150 4300 4000 3900
Speed limit
(at min. disp) continuous 4400 4450 4500 4650 4500
maximum 5000 5150 5300 5200 5050
Case pressure continuous bar [psi] 2 [29]
maximum 6 [87]
Fluid specifications
Ratings and data are based on operation with premium petroleum-based hydraulic fluids containing
oxidation, rust, and foam inhibitors.
Service Manual
K and L Frame Variable Motors, Cartridge Mount
Technical specifications
8 | © Danfoss | July 2017 520L0631 | AX00000042en-US0402