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 |
Controls |
•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
•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
•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)
© Danfoss | October 2021 |
AI152886483186en-000205 | 1 |
Technical specifications
MB1 |
MA1 |
Features |
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Unit |
Value |
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Displacement |
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cm3 [in3] |
LDU20: 0 - 20.0 [0 - 1.22] |
L1 |
L3 |
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LDU24: 0 - 24.0 [0 - 1.46] |
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Weight, (dry) |
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kg [lb] |
14.1 [31.1] |
L2 |
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Input speed |
Min. for external |
min-1 |
500 |
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charge supply |
(rpm) |
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S |
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Min. for full |
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1300 |
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performance |
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M3 |
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Rated |
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3400 |
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Maximum |
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3800 |
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System pressure |
Max. working |
bar [psi] |
300 [4350] |
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pressure* |
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Max. pressure |
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345 [5000] |
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Case pressure |
Rated |
bar [psi] |
1 [14.5] |
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Maximum |
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3 [43.5] |
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* Applied pressures above maximum working pressure requires Danfoss |
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P400 000 |
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application approval. |
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MB2 |
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166.52 Max |
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[ 6.556 ] |
149.6 ±1 |
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20 ±1 |
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Case drain port "L2" |
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[ 5.89 ±0.039 ] 95.6 ±1 |
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[3.764 ±0.039 ] |
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System A gage port "MA1" |
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[0.787 ±0.039 ] |
Port ISO 11926-1 -3/4-16 |
DISP. |
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18°MAXDISP |
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Port ISO 11926-1 -3/4-16 |
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14±1 |
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M10X1.5 Thread |
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18° MAX |
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Case drain port "L3" |
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18 [0.71] Min |
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46 |
±1 |
46 ±0.05 |
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Charge inlet port "S" |
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[ 0.551 |
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±1 |
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Ø9.8 |
±0.1 [0.386 ±0.004 |
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Charge gage (inlet) port "M3" |
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Thread depth |
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57.5 |
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[1.811 |
±0.039 |
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Ø9.8 ±0.1 [0.386 ±0.004 ] |
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High pressure |
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Port ISO 11926-1 -9/16-18 |
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X4 |
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[2.264±0.039 |
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<![if ! IE]> <![endif]>] |
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<![if ! IE]> <![endif]>] |
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relief valve B |
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Ø10 +00.036 |
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<![if ! IE]> <![endif]>±1 |
<![if ! IE]> <![endif]>±0.039 |
<![if ! IE]> <![endif]>±0.4 |
<![if ! IE]> <![endif]>±0.016 |
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<![if ! IE]> <![endif]>] |
<![if ! IE]> <![endif]>167.65 Max [6.600 ] |
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Depth 11 |
±0.1 |
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<![if ! IE]> <![endif]>27 |
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[0.386 |
±0.00140 |
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<![if ! IE]> <![endif]>[1.063 |
<![if ! IE]> <![endif]>23.8 |
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<![if ! IE]> <![endif]>±1 |
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<![if ! IE]> <![endif]>+0.039 |
<![if ! IE]> <![endif]>±0.039 |
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[0.433 ±0.004 ] |
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<![if ! IE]> <![endif]>±1 |
<![if ! IE]> <![endif]>±0.039 |
<![if ! IE]> <![endif]>±0.4 |
<![if ! IE]> <![endif]>±0.016 |
45° |
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<![if ! IE]> <![endif]>42 |
<![if ! IE]> <![endif]>1.654 |
<![if ! IE]> <![endif]>±1 |
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<![if ! IE]> <![endif]>4.803 |
<![if ! IE]> <![endif]>±0.039 |
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<![if ! IE]> <![endif]>±0.07 |
<![if ! IE]> <![endif]>] |
<![if ! IE]> <![endif]>±0.05 |
<![if ! IE]> <![endif]>] |
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<![if ! IE]> <![endif]>] [ |
<![if ! IE]> <![endif]>122 |
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<![if ! IE]> <![endif]>±0.0028 |
<![if ! IE]> <![endif]>±0.002 |
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<![if ! IE]> <![endif]>Max108.7 |
<![if ! IE]> <![endif]>[4.280] |
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<![if ! IE]> <![endif]>] |
<![if ! IE]> <![endif]>23.8 |
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<![if ! IE]> <![endif]>] |
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<![if ! IE]> <![endif]>+0.046 |
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<![if ! IE]> <![endif]>+0.0018 |
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<![if ! IE]> <![endif]>[ |
<![if ! IE]> <![endif]>] |
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<![if ! IE]> <![endif]>3.346[ |
<![if ! IE]> <![endif]>102.8 |
<![if ! IE]> <![endif]>4.047[ |
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<![if ! IE]> <![endif]>27 |
<![if ! IE]> <![endif]>1.063[ |
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<![if ! IE]> <![endif]>0.937[ |
4X |
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<![if ! IE]> <![endif]> |
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<![if ! IE]> <![endif]>102.8 |
<![if ! IE]> <![endif]>4.047[ |
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<![if ! IE]> <![endif]>85 |
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<![if ! IE]> <![endif]>0 |
<![if ! IE]> <![endif]>0 |
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<![if ! IE]> <![endif]>±0.2 |
<![if ! IE]> <![endif]>±0.25 |
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M8x1.25 Thread |
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<![if ! IE]> <![endif]>55 |
<![if ! IE]> <![endif]>[2.165 |
<![if ! IE]> <![endif]>69.15Max 2.722][ |
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<![if ! IE]> <![endif]>] |
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<![if ! IE]> <![endif]>] |
Ø16 |
±0.08 |
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R5 ±0.13 |
System B gage port "MB1" |
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2X |
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[R0.2 ±0.005 ] |
Port ISO 11926-1 -3/4-16 |
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[ 0.63 ±0.003 ] |
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17 |
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+0 |
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<![if ! IE]> <![endif]>24.5 |
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<![if ! IE]> <![endif]>10 |
<![if ! IE]> <![endif]>0.394[ |
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669 |
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<![if ! IE]> <![endif]>0.965[ |
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16 [0.63] Min thread depth |
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+0 |
.04 |
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5 |
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Ø19.5 |
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86.2 Max |
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86.2 Max |
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±0.003 |
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163.52 Max |
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+0.016 |
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0024 |
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[ 3.394] |
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[ 3.394] |
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] |
84.6 |
[ 6.438 ] |
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Case drain port "L1" |
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95.2 Max |
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95.2 Max |
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57.5 ±1 |
[ 3.3] |
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[ 3.748 ] |
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0.8 |
[ 3.748 ] |
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Port ISO 11926-1 -3/4-16 |
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[2.264±0.039 |
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[ 0.03] |
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High pressure |
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relief valve A |
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<![if ! IE]> <![endif]>] |
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<![if ! IE]> <![endif]>±1 |
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<![if ! IE]> <![endif]>±0.039 |
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CCW |
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CW |
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<![if ! IE]> <![endif]>42 |
<![if ! IE]> <![endif]>1.654 |
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<![if ! IE]> <![endif]>[ |
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<![if ! IE]> <![endif]>29.9 |
<![if ! IE]> <![endif]>] |
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<![if ! IE]> <![endif]>±0.008 |
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<![if ! IE]> <![endif]>1.2[ |
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<![if ! IE]> <![endif]>] |
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<![if ! IE]> <![endif]>±1 |
<![if ! IE]> <![endif]>±0.039] |
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<![if ! IE]> <![endif]>25 |
<![if ! IE]> <![endif]>[0.984 |
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<![if ! IE]> <![endif]>34 |
<![if ! IE]> <![endif]>[1.339 |
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<![if ! IE]> <![endif]>] |
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<![if ! IE]> <![endif]>±0.2 |
<![if ! IE]> <![endif]>±0.008 |
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Bypass valve |
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<![if ! IE]> <![endif]>49 |
<![if ! IE]> <![endif]>1.929 |
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<![if ! IE]> <![endif]>[ |
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71 ±0.2 |
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71 ±0.2 |
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4X Ø11 |
+0.38 |
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18 ±1 |
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[2.795 |
±0.008] |
[2.795 ±0.008 |
] |
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-0.05 |
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+0.015-0.002 ] |
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[0.709±0.039 ] |
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80 ±0.2 |
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80 |
±0.2 |
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[0.433 |
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P400001 |
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[3.15 ±0.008] |
[3.15 ±0.008] |
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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 |