Danfoss LDU20, LDU24 Data sheet
Data Sheet
LDU20/24
Closed Circuit Axial Piston Transmission
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 LDU20/24 was designed as a one housing U-style
transmission but can also be mounted in a Z-style
configuration. The design has been optimized to put
a slipper piston pump in the same size as traditional
no slipper piston transmissions (BDU).
Both LDU20/24 and BDU21 can be used in the same
mechanical transmissions using the same shaft
distances. This design helps with higher life and
performance in the same package and is well suited
for turf care, compact utility tractors and agriculture
vehicles (rice planters and combines).
Features
Designed for Durability and Flexibility
•
Best in class efficiency by male slipper
design
•
Longer life kit and higher duty
capability in the most compact design
in its class
•
Shortest shaft center line distance in it’s
class
•
Same shaft centerline as traditional
Bantam Duty U-style (BDU)
transmissions (shoeless piston type)
Installation and Packaging benefits
•
Optimized for shortest distance
between shaft center lines
•
U-style layout in housing able to mount
as either Z- or U- Style configurations
•
Pump and motor in single housing
•
Reduced noise
•
Supply charge pressure and case drains
directly through the transmission (no
hoses)
Controls
•
Direct Displacement Control (DDC)
•
Low operating force
Options
•
Loop bypass valve
•
High Pressure Relief Valves (HPRV)
•
Charge Pressure Relief Valve (CPRV)
Comprehensive technical literature is
online at www.danfoss.com
©
Danfoss | October 2021 AI152886483186en-000205 | 1
Technical specifications
MA1
MB1
MA2MB2
L1
L2
L3
M3
S
P400 000
[ ]
[1.339 ]
[0.709 ]
[ ]
2.264[ ]
2.795[ ]
3.15[ ]
1.929[ ]
0.984[ ]
[ ]
1.811[ ]
Ø9.8 0.386[ ]
[ ]
4.803[ ]
0.197
[ ]
[ ]
3.764[ ]
[ ]
0.937[ ]
R0.2[ ]
[ ]
0.768
[ ]
0.63
0.394
[ ]
0.965[ ]
1.063
[ ]
[ ]
Charge gage (inlet) port "M3"
Port ISO 11926-1 -9/16-18
System B gage port "MB1"
Port ISO 11926-1 -3/4-16
System A gage port "MA1"
Port ISO 11926-1 -3/4-16
0.787
0.551
±0.039
±0.039
±0.003
±0.001
±0.008
±0.005
M8x1.25 Thread
16 [0.63] Min thread depth
±0.039
1.063
[ ]
±0.039
[ ]
±0.003
4.280
[ ]
27
±1
27
±1
14
±1
20
±1
108.7 Max
Ø19.5
Ø16
±0.08
±0.08
R5
±0.13
10
±0.25
24.5
±0.2
Case drain port "L2"
Port ISO 11926-1 -3/4-16
High pressure
relief valve B
±0.039
±0.039
+0.0024
0.669
-0.0016
5.89
±0.039
M10X1.5 Thread
18 [0.71] Min
Thread depth
X4
18° MAX DISP.
18° MAX DISP.
95.6
±1
57.5
±1
42
±1
2X 17
+0.06
-0.04
4X 45°
149.6
±1
166.52 Max
55
23.8
±0.4
2.264
[
]
6.556[ ]
±0.016
0.937[ ]
±0.016
23.8
±0.4
Charge inlet port "S"
±0.039
1.811[ ]
±0.002
±0.039
4.047
±0.039
[ ]4.047
±0.002
[ ]3.346
±0.0028
±0.1
Depth 11
85
±0.07
102.8
±0.05
102.8
±1
122
±1
167.65 Max
69.15 Max
95.2 Max
86.2 Max
46±146
±0.05
Ø10
+0.036
0
6.600
[ ]
2.722[ ]
95.2 Max
86.2 Max
3.394[ ]
3.748[ ]
3.394[ ]
3.748[ ]
0
+0.016
0
+0.046
1.654
+0.039
163.52 Max
5
+0.4
0
6.438[ ]
Case drain port "L3"
±0.1 ±0.004
Ø9.8 0.386[ ]
±0.1 ±0.004
0.386[ ]
±0.0014
0
0.433
±0.004
Case drain port "L1"
Port ISO 11926-1 -3/4-16
High pressure
relief valve A
±0.039
1.654
±0.039
57.5
±1
42
±1
84.6
3.3[ ]
CW
CCW
±0.008
±0.008
25
±0.2
49
±0.2
4X Ø11
+0.38
-0.05
29.9
0.8
±0.008
±0.008
71
±0.2
80
±0.2
2.795[ ]
3.15[ ]
±0.008
±0.008
71
±0.2
80
±0.2
1.2
[ ]
0.03
[ ]
Bypass valve
P400001
34
±1
±0.039
18
±1
±0.039
[ ]
2.165
+0.0018
0
[0.433 ]
+0.015
-0.002
Features Unit Value
Displacement cm3 [in3] LDU20: 0 - 20.0 [0 - 1.22]
LDU24: 0 - 24.0 [0 - 1.46]
Weight, (dry) kg [lb] 14.1 [31.1]
Input speed Min. for external
charge supply
Min. for full
performance
Rated 3400
Maximum 3800
System pressure Max. working
*
pressure
Max. pressure 345 [5000]
Case pressure Rated bar [psi] 1 [14.5]
Maximum 3 [43.5]
*
Applied pressures above maximum working pressure requires Danfoss
application approval.
-1
min
500
(rpm)
1300
bar [psi] 300 [4350]
Danfoss can accept no responsibility for possible errors in catalogues, brochures and other printed material. Danfoss reserves the right to alter its products without notice. This also applies to products
already on order provided that such alterations can be made without subsequent changes being necessary in specifications already agreed.
All trademarks in this material are property of the respective companies. Danfoss and the Danfoss logotype are trademarks of Danfoss A/S. All rights reserved.
2 | © Danfoss | October 2021 AI152886483186en-000205
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