Danfoss hydrostatic product family
A word about the organization of this manual..................................................................................................................... 4
General description of H1 family hydrostatic pumps..........................................................................................................4
Overview of H1 pumps technical specifications...................................................................................................................5
H1 pumps literature reference.................................................................................................................................................... 6
Operation
Pressure limiter valves.................................................................................................................................................................... 7
High Pressure Relief Valve (HPRV) and charge check..........................................................................................................7
Bypass function.................................................................................................................................................................................8
Charge Pressure Relief Valve (CPRV) .........................................................................................................................................9
Electrical Displacement Control (EDC)...................................................................................................................................10
Manual Displacement Control (MDC).....................................................................................................................................11
Automotive Control (AC) ............................................................................................................................................................12
Automotive Control connection diagram ........................................................................................................................... 13
Forward-Neutral-Reverse (FNR) electric control.................................................................................................................14
Non Feedback Proportional Electric control (NFPE)..........................................................................................................14
Fan Drive Control (FDC)...............................................................................................................................................................15
Manual Over Ride (MOR).............................................................................................................................................................16
Swash plate angle sensor for NFPE and AC2 controls......................................................................................................17
Control-Cut-Off valve (CCO valve)........................................................................................................................................... 18
Displacement limiter.....................................................................................................................................................................19
Life time.............................................................................................................................................................................................19
Speed and temperature sensor................................................................................................................................................ 20
Operating parameters
Input speed...................................................................................................................................................................................... 22
System pressure............................................................................................................................................................................. 22
Servo pressure.................................................................................................................................................................................23
Charge pressure..............................................................................................................................................................................23
Charge pump inlet pressure...................................................................................................................................................... 23
Case pressure...................................................................................................................................................................................23
External shaft seal pressure........................................................................................................................................................24
Temperature and viscosity......................................................................................................................................................... 24
System design parameters
Filtration system.............................................................................................................................................................................25
Filtration............................................................................................................................................................................................26
Fluid selection.................................................................................................................................................................................30
Reservoir............................................................................................................................................................................................30
Case drain......................................................................................................................................................................................... 30
Charge pump...................................................................................................................................................................................31
Bearing loads and life ..................................................................................................................................................................32
Mounting flange loads.................................................................................................................................................................33
Shaft torque..................................................................................................................................................................................... 34
Shaft availability and torque ratings.......................................................................................................................................35
Understanding and minimizing system noise.....................................................................................................................36
Determination of nominal pump sizes.................................................................................................................................. 37
Basic Information
H1 Axial Piston Pumps, Single and Tandem
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Danfoss | April 2017 11062168 | BC00000057en-US0602 | 3
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