Danfoss LDU21C Service Manual page 15

Service Manual
LDU21C Closed Circuit Axial Piston Transmission
Technical Specifications
General Specifications
Design
Direction of Rotation
Recommended Installation Position
Physical Properties
Features
Displacement
Recommended charge pump displacement for external charge supply
Torque at maximum displacement (theoretical)
Mass moment of inertia of rotating
components
Weight dry
Oil volume
Port Configuration
High pressure gauge port
Case drain gauge ports
1
Max Swash angle is 19 deg.
Operation Parameters
Features
Input speed
System pressure
Input power
Charge pressure
Case pressure
Fluid Specifications
Features
Viscosity
Temperature
©
Danfoss | April 2025
U-style HST with variable displacement piston pump and fixed motor
Clockwise
Counterclockwise
Discretionary: The housing must be filled with hydraulic fluid
1
Pump side
Motor side
Pump side
Motor side
Case only
With passage
Minimum
Rated
Maximum
Maximum working pressure
Maximum pressure
Maximum
Minimum
Rated
Maximum
Minimum
Recommended range
Maximum
Minimum
Recommended range
Maximum
Units
3 3
cm /rev [in /rev]
3 3
cm /rev [in /rev]
N•m/bar [lbf•in/1000 psi]
2 2
kg•m [slug•ft ]
kg [lb]
liter [US gal]
SAE O-ring boss
SAE O-ring boss
Units
-1
min (rpm)
bar [psi]
kw [HP]
bar [psi]
bar [psi]
Units
2
mm /sec. [ SUS]
Degrees C [Degrees F]
AX342138485422en-000102 | 15
LDU21C
0-21 [0-1.28]
21 [1.28]
4 [0.24]
0.34 [207.4]
0.000919 [0.00680]
0.000696 [0.00512]
11.0 [24.3]
0.9 [0.24]
1.07 [0.28]
3/4-16 UNF
3/4-16 UNF
LDU21C
500
3600
3800
250 [3626]
280 [4061]
16 [21.5]
5 [73]
1 [14.5]
3 [43.5]
LDU21C
7 [49]
12-60 [66-280]
1600 [7500]
-20 [-4]
+50-75 [+122-167]
+104 [+220]