Introduction
Overview..............................................................................................................................................................................................5
Warranty.............................................................................................................................................................................................. 5
General instructions........................................................................................................................................................................ 5
Remove the unit.......................................................................................................................................................................... 5
Keep it clean..................................................................................................................................................................................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
Symbols used in Danfoss literature............................................................................................................................................7
Design...................................................................................................................................................................................................7
The System Circuit............................................................................................................................................................................8
Operation
Pressure Limiter Valves................................................................................................................................................................ 11
High Pressure Relief Valve (HPRV) and Charge Check...................................................................................................... 11
Bypass Function..............................................................................................................................................................................12
Charge Pressure Relief Valve......................................................................................................................................................12
Electrical Displacement Control (EDC)................................................................................................................................... 13
Manual OverRide (MOR).............................................................................................................................................................. 14
Manual Displacement Control (MDC) ....................................................................................................................................15
MDC Torque................................................................................................................................................................................16
Operating parameters
Input speed...................................................................................................................................................................................... 18
System pressure............................................................................................................................................................................. 18
Servo pressure.................................................................................................................................................................................18
Charge pressure..............................................................................................................................................................................19
Charge pump inlet pressure...................................................................................................................................................... 19
Case pressure...................................................................................................................................................................................19
External shaft seal pressure........................................................................................................................................................19
Temperature and viscosity......................................................................................................................................................... 20
Technical Specifications
Overview........................................................................................................................................................................................... 21
General Specifications..................................................................................................................................................................21
Physical Properties.........................................................................................................................................................................21
Operating Parameters .................................................................................................................................................................22
Fluid Specifications....................................................................................................................................................................... 22
Fluid and Filter Maintenance
Fluid and Filter Recommendations......................................................................................................................................... 23
Pressure Measurements
Port Locations and Gauge Installation................................................................................................................................... 24
Initial Startup Procedures
General ..............................................................................................................................................................................................26
Start-Up Procedure........................................................................................................................................................................26
Troubleshooting
Overview........................................................................................................................................................................................... 27
Safety Precautions......................................................................................................................................................................... 27
Electrical Troubleshooting..........................................................................................................................................................27
System Operating Hot..................................................................................................................................................................27
Integral Filter Bypass.....................................................................................................................................................................28
Neutral Difficult or Impossible to Find................................................................................................................................... 28
System Will Not Operate in Either Direction........................................................................................................................ 28
Service Manual
H1 Pumps 069/078, 089/100, 115/130, 147/165, 210/250
Contents
©
Danfoss | May 2018
520L0848 | AX00000087en-US0308 | 3
