General Specifications
Design
U-style HST with variable displacement piston pump and fixed motor
Direction of Rotation
Clockwise
Counterclockwise
Recommended Installation Position
Discretionary: The housing must be filled with hydraulic fluid
Physical Properties
Features
Units
LDU20
LDU24
Displacement
Pump side
1
cm
3
/rev [in
3
/rev]
0-20 [0-1.22]
0-24 [0-1.46]
Motor side
20 [1.22]
24 [1.46]
Recommended charge pump displacement for external charge supply
cm
3
/rev [in
3
/rev]
6 [0.37]
Torque at maximum displacement (theoretical)
N•m/bar [lbf•in/1000 psi]
0.32 [195.2]
0.38 [234.2]
Mass moment of inertia of
rotating components
Pump side
kg•m
2
[slug•ft
2
]
0.000936 [0.000693]
Motor side
0.000928 [0.000683]
Weight dry
kg [lb]
14.1 [31.1]
Oil volume
Case only
liter [US gal]
1.1 [0.28]
With passage
1.2 [0.32]
1
Max Swash angle is 18 deg.
Operating Parameters
Features
Units
LDU20
LDU24
Input speed
Minimum for external charge supply
min
-1
(rpm)
500
Minimum for full performance
1300
Rated
3400
Maximum
3800
System pressure
Maximum working pressure
bar [psi]
300 [4350]
Maximum pressure
345 [500]
Input power
Maximum
kw [PS]
22 [30]
26 [35]
Charge pressure
Minimum
bar [psi]
5 [73]
Case pressure
Rated
bar [psi]
1 [14.5]
Maximum
3 [43.5]
Service Manual
LDU20/24 Closed Circuit Axial Piston Transmission
Technical Specifications
14 |
©
Danfoss | June 2021
AX152886481311en-000304
