Introduction
Overview..............................................................................................................................................................................................5
Warranty.............................................................................................................................................................................................. 5
General instructions........................................................................................................................................................................ 5
Remove the unit.......................................................................................................................................................................... 5
Keep it clean..................................................................................................................................................................................5
Replace all O-rings and gaskets............................................................................................................................................. 5
Safety precautions............................................................................................................................................................................5
Symbols used in Danfoss literature............................................................................................................................................6
Design...................................................................................................................................................................................................7
The system circuit.............................................................................................................................................................................8
The basic closed circuit............................................................................................................................................................. 8
Case drain and heat exchanger..............................................................................................................................................8
Pump schematic............................................................................................................................................................................... 9
Fluid and filter maintenance
Fluid and filter recommendations........................................................................................................................................... 10
Hazardous material..................................................................................................................................................................10
Initial startup procedures
General ..............................................................................................................................................................................................11
Start-up procedure........................................................................................................................................................................11
Required tools and pressure measurements
Required tools................................................................................................................................................................................. 12
Port locations and gauge installation.....................................................................................................................................12
Troubleshooting
Overview........................................................................................................................................................................................... 14
Safety precautions.........................................................................................................................................................................14
System noise or vibration........................................................................................................................................................... 14
System operating hot...................................................................................................................................................................14
System will not operate in one direction.............................................................................................................................. 15
System will not operate in either direction.......................................................................................................................... 15
Neutral difficult or impossible to find.....................................................................................................................................16
System response is sluggish...................................................................................................................................................... 16
Electrical troubleshooting.......................................................................................................................................................... 17
Adjustments
Standard procedures, inspections, and adjustments....................................................................................................... 18
Warranty............................................................................................................................................................................................18
Pump adjustment.......................................................................................................................................................................... 18
Charge pressure relief valve.......................................................................................................................................................18
Engaging the bypass function.................................................................................................................................................. 19
System check/relief (SCR) valves.............................................................................................................................................. 20
Displacement limiter adjustment............................................................................................................................................ 21
Swashplate neutral adjustment................................................................................................................................................22
Measured data...........................................................................................................................................................................22
Pump Setup................................................................................................................................................................................ 22
Manual Displacement Control Neutral-Return Bracket Adjustment...........................................................................23
Measured data...........................................................................................................................................................................23
Procedure.................................................................................................................................................................................... 23
Electric Displacement Control/Hydraulic Displacement Control Neutral Adjustment........................................ 24
Measured data...........................................................................................................................................................................24
Procedure.................................................................................................................................................................................... 24
HC EDC Control...............................................................................................................................................................................25
Control neutral adjustment.................................................................................................................................................. 25
Minor repair
Standard procedures, removing the pump..........................................................................................................................28
Displacement limiter.....................................................................................................................................................................28
Pressure filtration adapter.......................................................................................................................................................... 29
Service Manual
Series 40 M46 Variable Pumps
Contents
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Danfoss | September 2017
11026743 | AX00000027en-US0202 | 3