System noise or vibration........................................................................................................................................................... 31
Sluggish system response...........................................................................................................................................................31
Adjustments
Pump adjustment..........................................................................................................................................................................32
Standard procedures....................................................................................................................................................................32
Charge pressure relief valve adjustment...............................................................................................................................32
Charge check / HPRV adjustment............................................................................................................................................ 34
Pressure Limiter Adjustment (060/068 only)....................................................................................................................... 34
Engaging the Bypass Function (060/068 only)..............................................................................................................38
Displacement limiter adjustment............................................................................................................................................ 39
Control Neutral Adjustment.......................................................................................................................................................40
Mechanical neutral adjustment................................................................................................................................................42
Pump setup.................................................................................................................................................................................43
Servo adjustment..................................................................................................................................................................... 44
Minor repair
Standard procedures, removing the pump..........................................................................................................................47
Electric control module................................................................................................................................................................47
Control solenoids...........................................................................................................................................................................49
MDC Control.................................................................................................................................................................................... 49
MDC illustration - tandems................................................................................................................................................... 50
MDC Legend - tandems..........................................................................................................................................................50
Angle sensor on EDC.....................................................................................................................................................................52
Removal........................................................................................................................................................................................52
Installation...................................................................................................................................................................................52
EDC with angle sensor..................................................................................................................................................................53
Removal........................................................................................................................................................................................53
Installation...................................................................................................................................................................................53
Front Shaft, seal, and bearing....................................................................................................................................................54
Charge Pump (045/053 only).....................................................................................................................................................56
Assembly......................................................................................................................................................................................58
Charge check / HPRV (45/53).....................................................................................................................................................58
HPRV (60/68)....................................................................................................................................................................................60
Removal........................................................................................................................................................................................60
Inspection....................................................................................................................................................................................60
Reassembly.................................................................................................................................................................................60
Charge pressure relief valve.......................................................................................................................................................61
Control cutoff valve and brake valve......................................................................................................................................63
Torque chart
Fastener size and torque chart..................................................................................................................................................66
Plug size and torque chart..........................................................................................................................................................66
Fasteners and plugs......................................................................................................................................................................67
Service Manual
H1 45/53/60/68 Tandem Closed Circuit Axial Piston Pumps
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Danfoss | June 2018 520L0928 | AX00000103en-US0303
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