Danfoss H1 078 - Default Chapter; Table of Contents

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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