Table Of Contents - Danfoss LDU24 Service Manual

Service Manual
LDU20/24 Closed Circuit Axial Piston Transmission
Contents
Introduction
General Description
Operation
Operating Parameters
Technical Specifications
Fluid and Filter Maintenance
Pressure Measurements
Initial Startup Procedure
Troubleshooting
© Danfoss | June 2021
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............................................................................................................................................................................. 6
Safety Precautions............................................................................................................................................................................6
Unintended machine movement..........................................................................................................................................6
Flammable cleaning solvents................................................................................................................................................. 6
Fluid under pressure.................................................................................................................................................................. 6
Personal safety............................................................................................................................................................................. 6
Hazardous material.................................................................................................................................................................... 6
Symbols Used in Danfoss Literature..........................................................................................................................................7
Basic Design........................................................................................................................................................................................8
Key Features....................................................................................................................................................................................... 8
Typical Applications........................................................................................................................................................................ 8
Schematic Diagram..........................................................................................................................................................................8
HPRV (High Pressure Relief Valve) ............................................................................................................................................. 9
Charge Check Relief Valve with Orifice............................................................................................................................... 9
Bypass Function..............................................................................................................................................................................10
CPRV (Charge Pressure Relief Valve)....................................................................................................................................... 11
Control............................................................................................................................................................................................... 11
Direct Displacement Control................................................................................................................................................11
Control Handle Requirements............................................................................................................................................. 11
Overview........................................................................................................................................................................................... 12
Input Speed......................................................................................................................................................................................12
System Pressure..............................................................................................................................................................................12
Input Power......................................................................................................................................................................................12
Charge Pressure..............................................................................................................................................................................13
Case Pressure...................................................................................................................................................................................13
Viscosity.............................................................................................................................................................................................13
Temperature.................................................................................................................................................................................... 13
General Specifications..................................................................................................................................................................14
Physical Properties.........................................................................................................................................................................14
Operating Parameters.................................................................................................................................................................. 14
Fluid Specifications....................................................................................................................................................................... 15
Fluid and Filter Recommendations......................................................................................................................................... 16
Port Locations and Gauge Installation................................................................................................................................... 17
Startup Procedure..........................................................................................................................................................................18
Overview........................................................................................................................................................................................... 19
System Operating Hot..................................................................................................................................................................19
Transmission Operates Normally in One Direction Only.................................................................................................19
System will not Operate in Either Direction......................................................................................................................... 19
System Noise or Vibration...........................................................................................................................................................20
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