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Danfoss Power Solutions is a global manufacturer and supplier of high-quality hydraulic and
electric components. We specialize in providing state-of-the-art technology and solutions
that excel in the harsh operating conditions of the mobile off-highway market as well as the
marine sector. Building on our extensive applications expertise, we work closely with you to
ensure exceptional performance for a broad range of applications. We help you and other
customers around the world speed up system development, reduce costs and bring vehicles
and vessels to market faster.

Danfoss Power Solutions – your strongest partner in mobile hydraulics and mobile
electrification.
Go to www.danfoss.com for further product information.

We offer you expert worldwide support for ensuring the best possible solutions for
outstanding performance. And with an extensive network of Global Service Partners, we also
provide you with comprehensive global service for all of our components.

Local address:

Danfoss 

Power Solutions GmbH & Co. OHG

Krokamp 35

D-24539 Neumünster, Germany

Phone: +49 4321 871 0

Danfoss 

Power Solutions ApS

Nordborgvej 81

DK-6430 Nordborg, Denmark

Phone: +45 7488 2222

Danfoss 

Power Solutions (US) Company

2800 East 13th Street

Ames, IA 50010, USA

Phone: +1 515 239 6000

Danfoss 

Power Solutions Trading

(Shanghai) Co., Ltd.

Building #22, No. 1000 Jin Hai Rd

Jin Qiao, Pudong New District

Shanghai, China 201206

Phone: +86 21 2080 6201

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.

©

 Danfoss | June 2021

AX152886481311en-000304

Products we offer:

Cartridge valves

DCV directional control

valves

Electric converters

Electric machines

Electric motors

Gear motors

Gear pumps

Hydraulic integrated

circuits (HICs)

Hydrostatic motors

Hydrostatic pumps

Orbital motors

PLUS+1

®

 controllers

PLUS+1

®

 displays

PLUS+1

®

 joysticks and

pedals

PLUS+1

®

 operator

interfaces

PLUS+1

®

 sensors

PLUS+1

®

 software

PLUS+1

®

 software services,

support and training

Position controls and

sensors

PVG proportional valves

Steering components and

systems

Telematics

Hydro-Gear

www.hydro-gear.com
Daikin-Sauer-Danfoss

www.daikin-sauer-danfoss.com 

Содержание LDU24

Страница 1: ...Service Manual LDU20 24 Closed Circuit Axial Piston Transmission www danfoss com...

Страница 2: ...document number from AX00000049 and 11071687 to AX152886481311 0304 July 2017 Updated to Engineering Tomorrow 0202 March 2014 Danfoss layout BA January 2011 First edition AA Service Manual LDU20 24 C...

Страница 3: ...Displacement Control 11 Control Handle Requirements 11 Operating Parameters Overview 12 Input Speed 12 System Pressure 12 Input Power 12 Charge Pressure 13 Case Pressure 13 Viscosity 13 Temperature 1...

Страница 4: ...e check HPRV operation 21 Minor Repair Shaft Seals 22 Removal 22 Inspection 22 Assembly 22 Charge Check HPRV 23 Removal 23 Inspection 23 Reassembly 23 Bypass Valve 24 Removal 24 Inspection 24 Reassemb...

Страница 5: ...cedures Remove the unit Prior to performing major repairs remove the unit from the vehicle machine Chock the wheels on the vehicle or lock the mechanism to inhibit movement Be aware that hydraulic flu...

Страница 6: ...where a source of ignition may be present Fluid under pressure W Warning Escaping hydraulic fluid under pressure can have sufficient force to penetrate your skin causing serious injury and or infecti...

Страница 7: ...ent required Pull out with tool press fit Flatness specification Parallelism specification Cover splines with installation cylinder Mark orientation for reinstallation The symbols above appear in the...

Страница 8: ...ne housing with Z shaft configuration Available external charge Bypass valve for the pulling of the vehicle Same shaft center distance as BDU21 85mm Between pump and motor shaft Same drive line design...

Страница 9: ...High Pressure Relief Valve P400005 C Caution HPRV s are factory set at a low flow condition Any application or operating condition which leads to elevated HPRV flow will cause a pressure rise with flo...

Страница 10: ...winched onto a trailer without operating the prime mover C Caution Excessive speed or extended movement will damage the transmission Avoid excessive speeds and extended load vehicle movement Do not mo...

Страница 11: ...irectly to the swashplate trunnion Control lever movement changes the speed and rotating direction of the motor by increasing or decreasing the swashplate angle The control input shaft is configurable...

Страница 12: ...mission sufficient to stop and hold the vehicle or machine in the event of hydrostatic drive power loss System Pressure System pressure is the differential pressure between system ports A and B It is...

Страница 13: ...sity Maintain fluid viscosity within the recommended range for maximum efficiency and bearing life Minimum viscosity should only occur during brief occasions of maximum ambient temperature and severe...

Страница 14: ...4 2 Mass moment of inertia of rotating components Pump side kg m2 slug ft2 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 pas...

Страница 15: ...180 Maximum 104 220 Filtration recommended minimum Cleanliness per ISO 4406 22 18 13 Efficiency charge pressure filtration b ratio b 15 20 75 b 10 10 Efficiency suction and return line filtration b 15...

Страница 16: ...s of operation Fluid and Filter Change Interval Reservoir Type Max Oil Change Interval Sealed 2000 Hours Breather 500 Hours C Caution High temperatures and pressures accelerate fluid aging This may re...

Страница 17: ...ar psi L1 L2 3 4 16 UNF 5 16 internal hex Case Drain 10 100 MA1 MA2 MB1 MB2 3 4 16 UNF 7 8 hex wrench System Pressure 500 5000 M3 9 16 18 UNF 1 4 internal hex Charge Pressure 50 1000 Port Locations M3...

Страница 18: ...ure may damage hydraulic components Check carefully for inlet line leaks Do not run at maximum pressure until system is free of air and fluid has been thoroughly filtered 8 Use a common method to disa...

Страница 19: ...at in system Measure system pressure If pressure is too high reduce loads Transmission Operates Normally in One Direction Only Item Description Action Control linkage Control linkage is operating impr...

Страница 20: ...igned HST and prime mover shafts create noise Align shafts Charge check HPRVs Unusual noise may indicate sticking valves Possible contamination Clean replace valves and test the unit Sluggish System R...

Страница 21: ...s of system contamination such as oil discoloration foam in the oil sludge or small metal particles 4 Remove the transmission C Caution Be careful not to damage solenoids and electrical connections wh...

Страница 22: ...tion 2 Using a seal installation tool start the seal into the housing bore Hand press the seal the rest of the way into the housing bore Ensure the seal clears the retaining ring groove in the housing...

Страница 23: ...damage or foreign material Reassembly 1 Lubricate and install new O rings N130 P130 on valve seat plug N120 P120 2 Verify that the conical springs N100 P100 are properly retained on the check relief v...

Страница 24: ...sary Reassembly 1 Lubricate and install new O ring M110 M130 and backup ring M120 onto cartridge 2 Install the bypass valve cartridge using a 17mm hex wrench Torque to 12 N m 9lbf ft Bypass Valve P108...

Страница 25: ...57 8 J400 9 16 18 UNF 1 4 internal hex 35 25 8 Y300 3 4 16 UNF 5 16 internal hex 39 2 29 Plugs J400 J200 J250 J300 J350 L1 L2 REVERSE SIDE Y300 Y300 P108482 MB1 M3 MA1 MB2 MA2 REVERSE SIDE REVERSE SID...

Страница 26: ...anfoss Power Solutions US Company 2800 East 13th Street Ames IA 50010 USA Phone 1 515 239 6000 Danfoss Power Solutions Trading Shanghai Co Ltd Building 22 No 1000 Jin Hai Rd Jin Qiao Pudong New Distri...

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