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

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		Unit	Value
Displacement		cm3 [in3]	LDU20: 0 - 20.0 [0 - 1.22]	L1	L3
			LDU24: 0 - 24.0 [0 - 1.46]
Weight, (dry)		kg [lb]	14.1 [31.1]	L2
Input speed	Min. for external	min-1	500
	charge supply	(rpm)			S
	Min. for full		1300
	performance				M3
	Rated		3400
	Maximum		3800
System pressure	Max. working	bar [psi]	300 [4350]
	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

P400 000

application approval.

MB2

MA2

166.52 Max

[ 6.556 ]

149.6 ±1

20 ±1

Case drain port "L2"

[ 5.89 ±0.039 ] 95.6 ±1

[3.764 ±0.039 ]

System A gage port "MA1"

[0.787 ±0.039 ]

Port ISO 11926-1 -3/4-16

DISP.

18°MAXDISP

Port ISO 11926-1 -3/4-16

14±1

M10X1.5 Thread

18° MAX

.

Case drain port "L3"

18 [0.71] Min

46

±1

46 ±0.05

Charge inlet port "S"

[ 0.551

±0.039

]

±1

Ø9.8

±0.1 [0.386 ±0.004

]

Charge gage (inlet) port "M3"

Thread depth

57.5

[1.811

±0.039

] [1.811±0.002 ]

Ø9.8 ±0.1 [0.386 ±0.004 ]

High pressure

Port ISO 11926-1 -9/16-18

X4

[2.264±0.039

]

<![if ! IE]> <![endif]>]

<![if ! IE]> <![endif]>]

relief valve B

Ø10 +00.036

<![if ! IE]> <![endif]>±1

<![if ! IE]> <![endif]>±0.039

<![if ! IE]> <![endif]>±0.4

<![if ! IE]> <![endif]>±0.016

<![if ! IE]> <![endif]>]

<![if ! IE]> <![endif]>167.65 Max [6.600 ]

Depth 11

±0.1

<![if ! IE]> <![endif]>27

[0.386

±0.00140

]

<![if ! IE]> <![endif]>[1.063

<![if ! IE]> <![endif]>23.8

<![if ! IE]> <![endif]>[0.937

<![if ! IE]> <![endif]>±1

<![if ! IE]> <![endif]>+0.039

<![if ! IE]> <![endif]>±0.039

[0.433 ±0.004 ]

<![if ! IE]> <![endif]>]

<![if ! IE]> <![endif]>±1

<![if ! IE]> <![endif]>±0.039

<![if ! IE]> <![endif]>±0.4

<![if ! IE]> <![endif]>±0.016

45°

<![if ! IE]> <![endif]>42

<![if ! IE]> <![endif]>1.654

<![if ! IE]> <![endif]>±1

<![if ! IE]> <![endif]>4.803

<![if ! IE]> <![endif]>±0.039

<![if ! IE]> <![endif]>±0.07

<![if ! IE]> <![endif]>]

<![if ! IE]> <![endif]>±0.05

<![if ! IE]> <![endif]>]

<![if ! IE]> <![endif]>] [

<![if ! IE]> <![endif]>122

<![if ! IE]> <![endif]>±1

<![if ! IE]> <![endif]>±0.0028

<![if ! IE]> <![endif]>±0.002

<![if ! IE]> <![endif]>Max108.7

<![if ! IE]> <![endif]>[4.280]

<![if ! IE]> <![endif]>]

<![if ! IE]> <![endif]>23.8

<![if ! IE]> <![endif]>]

<![if ! IE]> <![endif]>+0.046

<![if ! IE]> <![endif]>+0.0018

<![if ! IE]> <![endif]>[

<![if ! IE]> <![endif]>]

<![if ! IE]> <![endif]>3.346[

<![if ! IE]> <![endif]>102.8

<![if ! IE]> <![endif]>4.047[

<![if ! IE]> <![endif]>27

<![if ! IE]> <![endif]>1.063[

<![if ! IE]> <![endif]>0.937[

4X

<![if ! IE]> <![endif]>

<![if ! IE]> <![endif]>102.8

<![if ! IE]> <![endif]>4.047[

<![if ! IE]> <![endif]>85

<![if ! IE]> <![endif]>±0.008

<![if ! IE]> <![endif]>±0.001

<![if ! IE]> <![endif]>0

<![if ! IE]> <![endif]>0

<![if ! IE]> <![endif]>±0.2

<![if ! IE]> <![endif]>±0.25

M8x1.25 Thread

.

-

<![if ! IE]> <![endif]>55

<![if ! IE]> <![endif]>[2.165

<![if ! IE]> <![endif]>69.15Max 2.722][

<![if ! IE]> <![endif]>]

<![if ! IE]> <![endif]>]

Ø16

±0.08

R5 ±0.13

System B gage port "MB1"

2X

[R0.2 ±0.005 ]

Port ISO 11926-1 -3/4-16

[ 0.63 ±0.003 ]

[

17

0

+0

<![if ! IE]> <![endif]>24.5

<![if ! IE]> <![endif]>10

<![if ! IE]> <![endif]>0.394[

±0.08

669

0.06

+0.4

<![if ! IE]> <![endif]>0.965[

16 [0.63] Min thread depth

+0

.04

5

[0.768

]

- .

0

]

0016

[0.197

Ø19.5

0

86.2 Max

86.2 Max

±0.003

.

163.52 Max

+0.016

0024

[ 3.394]

[ 3.394]

]

84.6

[ 6.438 ]

0

Case drain port "L1"

95.2 Max

95.2 Max

57.5 ±1

[ 3.3]

[ 3.748 ]

0.8

[ 3.748 ]

Port ISO 11926-1 -3/4-16

[2.264±0.039

]

[ 0.03]

High pressure

relief valve A

<![if ! IE]> <![endif]>]

<![if ! IE]> <![endif]>±1

<![if ! IE]> <![endif]>±0.039

CCW

CW

<![if ! IE]> <![endif]>42

<![if ! IE]> <![endif]>1.654

<![if ! IE]> <![endif]>[

<![if ! IE]> <![endif]>29.9

<![if ! IE]> <![endif]>]

<![if ! IE]> <![endif]>±0.2

<![if ! IE]> <![endif]>±0.008

<![if ! IE]> <![endif]>1.2[

<![if ! IE]> <![endif]>]

<![if ! IE]> <![endif]>±1

<![if ! IE]> <![endif]>±0.039]

<![if ! IE]> <![endif]>25

<![if ! IE]> <![endif]>[0.984

<![if ! IE]> <![endif]>34

<![if ! IE]> <![endif]>[1.339

<![if ! IE]> <![endif]>]

<![if ! IE]> <![endif]>±0.2

<![if ! IE]> <![endif]>±0.008

Bypass valve

<![if ! IE]> <![endif]>49

<![if ! IE]> <![endif]>1.929

<![if ! IE]> <![endif]>[

71 ±0.2

71 ±0.2

4X Ø11

+0.38

18 ±1

[2.795

±0.008]

[2.795 ±0.008

]

-0.05

+0.015-0.002 ]

[0.709±0.039 ]

80 ±0.2

80

±0.2

[0.433

P400001

[3.15 ±0.008]

[3.15 ±0.008]

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