Danfoss H1P 280

System Operating Hot..................................................................................................................................................................31
System Will Not Operate in Either Direction........................................................................................................................32
System Noise or Vibration...........................................................................................................................................................32
Sluggish System Response.........................................................................................................................................................32
Adjustments
Standard Procedures.................................................................................................................................................................... 34
Charge Pressure Relief Valve Adjustments...........................................................................................................................34
Pressure Limiter Adjustment..................................................................................................................................................... 35
Engaging the Bypass Function..................................................................................................................................................37
Displacement Limiter Adjustment for Single Pumps........................................................................................................37
Control Neutral Adjustment.......................................................................................................................................................38
Mechanical Neutral Adjustment...............................................................................................................................................40
Unintended Machine Movement....................................................................................................................................... 40
Minor Repair
Control Solenoids Repair.............................................................................................................................................................45
MDC Control Repair.......................................................................................................................................................................46
Angle sensor on EDC Repair.......................................................................................................................................................49
EDC with Angle Sensor Repair...................................................................................................................................................50
Automotive Control Repair........................................................................................................................................................ 51
Shaft, Seal and Bearing Repair...................................................................................................................................................55
External Filter Repair.....................................................................................................................................................................57
Filter Bypass Valve and Switch Repair.................................................................................................................................... 58
Charge Pump Repair (Removable Auxiliary Pad)............................................................................................................... 58
Charge Pump Repair (Integrated Auxiliary Pad).................................................................................................................59
High Pressure Relief Valve Repair.............................................................................................................................................61
Charge Pressure Relief Valve Repair........................................................................................................................................62
Pressure Limiter Repair................................................................................................................................................................ 62
Torque Chart
Fasteners and Plugs...................................................................................................................................................................... 64
Fastener Size and Torque Chart................................................................................................................................................65
Plug Size and Torque Chart........................................................................................................................................................66
Service Manual
H1P 069—H1P 280 Axial Piston Single Pumps
Contents
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Danfoss | January 2021 AX152886482551en-000601