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Summary of Contents for Danfoss LDU32
- Page 1 Service Manual LDU32 Closed Circuit Axial Piston Transmission www.danfoss.com...
- Page 2 Service Manual LDU32 Closed Circuit Axial Piston Transmission Revision history Table of revisions Date Changed March 2025 First edition 0101 © Danfoss | March 2025 AX508524163671en-000101...
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Page 3: Table Of Contents
Service Manual LDU32 Closed Circuit Axial Piston Transmission Contents Introduction Overview......................................5 Warranty......................................5 General Instructions..................................5 Remove the unit..................................5 Keep it clean....................................5 Lubricate moving parts................................5 Replace all O-rings and gaskets............................. 5 Secure the unit..................................... 5 Safety Precautions....................................5 Unintended machine movement............................6 Flammable cleaning solvents.............................. - Page 4 Service Manual LDU32 Closed Circuit Axial Piston Transmission Contents Required Tools and Standard Procedures Required Tools....................................20 Standard Procedures..................................20 Charge Check/HPRV Adjustments............................20 Checking for proper charge check/HPRV operation....................20 Minor Repair Shaft Seals......................................21 Removal......................................21 Inspection....................................21 Assembly......................................21 Charge Check/HPRV..................................22 Removal......................................22 Inspection....................................22...
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Page 5: Overview
A worldwide network of Danfoss Authorized Service Centers is available for major repairs. Danfoss trains and certifies Authorized Service Centers on a regular basis. You can locate your nearest Authorized Service Center using the distributor locator at www.danfoss.com. -
Page 6: Unintended Machine Movement
Service Manual LDU32 Closed Circuit Axial Piston Transmission Introduction Unintended machine movement Warning Unintended movement of the machine or mechanism may cause injury to the technician or bystanders. To protect against unintended movement, secure the machine or disable/disconnect the mechanism while servicing. -
Page 7: Symbols Used In Danfoss Literature
Service Manual LDU32 Closed Circuit Axial Piston Transmission Introduction Symbols Used in Danfoss Literature WARNING may result in injury CAUTION may result in damage to product or property Non-reusable part, use a new part External hex head Internal hex head... -
Page 8: General Description
General Description Basic Design LDU32 is a kind of U-style HST hardware, including a closed circuit variable displacement piston pump with DDC (Direct displacement control) and a fixed motor. LDU32 is specially designed with optimized performance, size, and cost, in order to fulfill the demand of the mobile applications marketplace. This document provides the detailed specifications and features for LDU32. -
Page 9: Operation
Check / High Pressure Relief Valve with Orifice As an option, The LDU32 offers Check / HPRV with an orifice produce a larger neutral deadband. In some applications, it is desirable to use Check / HPRV with an orifice to expand neutral dead band, which would help provide a larger margin of safety for vehicle movement in neutral and provide easier adjustment of the vehicle linkage for machine neutral. -
Page 10: Cprv (Charge Pressure Relief Valve)
Control Direct Displacement Control The LDU32 features Direct Displacement Control (DDC) . The swashplate angle is set directly by a control lever or linkage attached directly to the swashplate control arm. Control lever movement changes the speed and rotating direction of the motor by increasing or decreasing the swashplate angle. -
Page 11: Operating Parameters
LDU32 Closed Circuit Axial Piston Transmission Operating Parameters Overview This section defines the operating parameters and limitations for LDU32 with regard to input speeds and pressures. For actual parameter data, refer to the Operating Parameters in the Technical Specifications section. -
Page 12: Charge Pressure
Minimum viscosity should only occur during brief occasions of maximum ambient temperature and severe duty cycle operation. Maximum viscosity should only occur at cold start. Limit speeds until the system warms up. Refer to the fluid specifications in LDU32 Technical Information manual BC281913833325. -
Page 13: Technical Specifications
Service Manual LDU32 Closed Circuit Axial Piston Transmission Technical Specifications General Specifications Design U-style HST with variable displacement piston pump and fixed motor Direction of Rotation Clockwise Recommended Installation Position Discretionary: The housing must be filled with hydraulic fluid Physical Properties... -
Page 14: Fluid Specifications
Service Manual LDU32 Closed Circuit Axial Piston Transmission Technical Specifications Fluid Specifications Features Units LDU32 Viscosity Minimum /sec. [ SUS] 7 [49] Continuous 12-60 [66-280] Maximum 1600 [7500] Temperature Minimum Degrees C [Degrees F] -40 [-40] Recommended range +82 [+180]... -
Page 15: Fluid And Filter Maintenance
Service Manual LDU32 Closed Circuit Axial Piston Transmission Fluid and Filter Maintenance Fluid and Filter Recommendations To ensure optimum life, perform regular maintenance of the fluid and filter. Contaminated fluid is the main cause of unit failure. Take care to maintain fluid cleanliness when servicing. -
Page 16: Pressure Measurements
Service Manual LDU32 Closed Circuit Axial Piston Transmission Pressure Measurements Port Locations and Gauge Installation The following table and drawing show the port locations and gauge sizes needed. Port Information Port Identifier Port Size Wrench Size Pressure Obtained Gauge Size, bar [psi]... -
Page 17: Initial Startup Procedure
Initial Startup Procedure Startup Procedure Always follow this procedure when starting up a new LDU32 installation or when the transmission has been removed and reinstalled on a machine. If the unit was torn down and reassembled before reinstalling on a machine, the product should be tested on a test stand and pass the necessary quality checks according to the test specification for LDU32. -
Page 18: Troubleshooting
Service Manual LDU32 Closed Circuit Axial Piston Transmission Troubleshooting Overview This section provides general steps to follow if you observe undesirable system conditions. Follow the steps listed until you solve the problem. Some of the items are system specific. We reference the section in this manual of more information is available. -
Page 19: Sluggish System Response
Service Manual LDU32 Closed Circuit Axial Piston Transmission Troubleshooting Sluggish System Response Item Description Action Oil level in reservoir Low oil level causes sluggish response. Fill reservoir. Charge check/HPRVs Incorrect pressure settings affects system reaction time. Replace charge check/HPRVs Low prime mover speed Low engine speed reduces system performance Adjust engine speed. -
Page 20: Required Tools And Standard Procedures
Service Manual LDU32 Closed Circuit Axial Piston Transmission Required Tools and Standard Procedures Required Tools The service procedures described in this manual can be performed using common mechanic's hand tools. Special tools, if required, are shown. When testing system pressure, calibrate pressure gauges frequently to ensure accuracy. -
Page 21: Minor Repair
Service Manual LDU32 Closed Circuit Axial Piston Transmission Minor Repair Shaft Seals Removal 1. Using a snap ring pliers, remove retaining ring (F125, H125, F215, H215). 2. Use a slide-hammer style puller to remove seal (F115, F210, H210) and bore plug (H115). Be careful not to damage the shaft or seal bore when removing the seal. -
Page 22: Charge Check/Hprv
Service Manual LDU32 Closed Circuit Axial Piston Transmission Minor Repair Charge Check/HPRV The high pressure relief and charge check valve assembly may be removed for cleaning and replacement of the O-rings. These valves are factory set and are not field adjustable. Refer to the transmission model code for the factory setting when ordering replacements. -
Page 23: Torque Chart
Service Manual LDU32 Closed Circuit Axial Piston Transmission Torque Chart Plug Size and Torque Chart Item O-ring Plug Wrench Size Torque N•m [lbf•ft] J200, J250, J300, J350 M18x1.5 24mm external hex 70.0 [51.6] Y300, Y310 3/4-16 UNF 5/16 internal hex 29.0 [21.4]... - Page 24 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.
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