Table Of Contents - Danfoss LDT 21 Service Manual

Service Manual
LDT 21/24/32 Closed Circuit Axial Piston Transmission
Contents
Introduction
General Description
Operations
Operating Parameters
Technical Specifications
Fluid and Filter Maintenance
Pressure Measurements
Startup procedures
Troubleshooting
© Danfoss | June 2022
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................................................................................................................................................. 6
Fluid under pressure.................................................................................................................................................................. 6
Personal safety............................................................................................................................................................................. 6
Hazardous material.................................................................................................................................................................... 6
Basic Design........................................................................................................................................................................................7
Key Features....................................................................................................................................................................................... 7
Typical Applications........................................................................................................................................................................ 7
LDT Schematics................................................................................................................................................................................. 7
Check / High Pressure Relief Valve ............................................................................................................................................9
Check/High Pressure Relief Valve with Orifice.......................................................................................................................9
CPRV (Charge Pressure Relief Valve)....................................................................................................................................... 10
Control............................................................................................................................................................................................... 11
Direct Displacement Control................................................................................................................................................11
Control Handle Requirements............................................................................................................................................. 11
Overview........................................................................................................................................................................................... 12
Input / Output Speed....................................................................................................................................................................12
System Pressure..............................................................................................................................................................................12
Input Power......................................................................................................................................................................................12
Charge Pressure..............................................................................................................................................................................12
Case pressure...................................................................................................................................................................................13
Viscosity.............................................................................................................................................................................................13
Temperature.................................................................................................................................................................................... 13
General Specifications..................................................................................................................................................................14
Physical Properties.........................................................................................................................................................................14
Operating Parameters.................................................................................................................................................................. 14
Fluid Specifications....................................................................................................................................................................... 15
Fluid and Filter Recommendations......................................................................................................................................... 16
LDT24 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...........................................................................................................................................................19
Sluggish System Response......................................................................................................................................................... 20
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