Introduction
Overview..............................................................................................................................................................................................5
Warranty.............................................................................................................................................................................................. 5
General instructions........................................................................................................................................................................ 5
Remove the unit..........................................................................................................................................................................5
Replace all O-rings and gaskets............................................................................................................................................. 5
Safety Precautions............................................................................................................................................................................6
Unintended machine movement..........................................................................................................................................6
Flammable cleaning solvents.................................................................................................................................................6
Fluid under pressure..................................................................................................................................................................6
Personal safety.............................................................................................................................................................................6
Symbols used in Danfoss literature............................................................................................................................................6
Design...................................................................................................................................................................................................7
Pump schematic............................................................................................................................................................................... 8
The system circuit.............................................................................................................................................................................9
Operation
Pressure Limiter Valves (060/068 only)..................................................................................................................................11
High pressure relief valve (HPRV) and charge check.........................................................................................................11
Charge Pressure Relief Valve......................................................................................................................................................12
Electrical displacement control (EDC).................................................................................................................................... 13
Manual OverRide (MOR)..............................................................................................................................................................14
Manual Displacement Control (MDC) ....................................................................................................................................15
Control-Cut-Off (CCO) valve and brake valve......................................................................................................................17
Operating parameters
Overview........................................................................................................................................................................................... 20
Input speed...................................................................................................................................................................................... 20
System pressure............................................................................................................................................................................. 20
Charge pressure..............................................................................................................................................................................20
Charge inlet pressure....................................................................................................................................................................21
Case pressure...................................................................................................................................................................................21
Temperature and viscosity......................................................................................................................................................... 21
Temperature...............................................................................................................................................................................21
Viscosity........................................................................................................................................................................................21
Technical Specifications
H1T general specifications..........................................................................................................................................................22
Technical data H1 Tandem.........................................................................................................................................................22
Operating parameters H1 Tandem..........................................................................................................................................23
Fluid Specifications....................................................................................................................................................................... 23
Fluid and filter maintenance
Fluid and filter recommendations........................................................................................................................................... 25
Hazardous material..................................................................................................................................................................25
Pressure measurements
Port locations and gauge installation - 045/053.................................................................................................................26
Port locations and gauge installation - 060/068.................................................................................................................27
Initial startup procedures
General ..............................................................................................................................................................................................28
Start-up procedure........................................................................................................................................................................28
Troubleshooting
Overview........................................................................................................................................................................................... 29
Safety precautions.........................................................................................................................................................................29
Electrical troubleshooting.......................................................................................................................................................... 29
Neutral difficult or impossible to find.....................................................................................................................................30
System operating hot...................................................................................................................................................................30
Transmission operates normally in one direction only....................................................................................................30
System will not operate in either direction.......................................................................................................................... 30
Service Manual
H1 45/53/60/68 Tandem Closed Circuit Axial Piston Pumps
Contents
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Danfoss | June 2018 520L0928 | AX00000103en-US0303 | 3