Danfoss Series 40 M46 Tandem

Introduction
Overview..............................................................................................................................................................................................4
Warranty.............................................................................................................................................................................................. 4
General instructions........................................................................................................................................................................ 4
Safety precautions............................................................................................................................................................................4
Symbols used in Danfoss literature............................................................................................................................................6
Design...................................................................................................................................................................................................6
The system circuit.............................................................................................................................................................................7
Pump schematic............................................................................................................................................................................... 9
Fluid and filter maintenance
Fluid and filter recommendations........................................................................................................................................... 10
Initial startup procedures
General ..............................................................................................................................................................................................11
Start-up procedure........................................................................................................................................................................11
Pressure measurements
Required tools.................................................................................................................................................................................13
Port locations and gauge installation.....................................................................................................................................13
Troubleshooting
Overview........................................................................................................................................................................................... 15
Safety precautions.........................................................................................................................................................................15
System noise or vibration........................................................................................................................................................... 15
System operating hot...................................................................................................................................................................15
System will not operate in one direction.............................................................................................................................. 16
System will not operate in either direction.......................................................................................................................... 16
Neutral difficult or impossible to find.....................................................................................................................................17
System response is sluggish...................................................................................................................................................... 17
Electrical troubleshooting.......................................................................................................................................................... 18
Adjustments
Standard procedures, inspections, and adjustments....................................................................................................... 19
Warranty............................................................................................................................................................................................19
Pump adjustment..........................................................................................................................................................................19
Charge pressure relief valve.......................................................................................................................................................19
Engaging the bypass function.................................................................................................................................................. 20
System check/relief (SCR) valves.............................................................................................................................................. 21
Displacement limiter adjustment............................................................................................................................................ 22
Displacement limiter adjustment data.................................................................................................................................. 23
Swashplate neutral adjustment................................................................................................................................................23
Manual Displacement Control Bracket Neutral Adjustment..........................................................................................24
Electronic Displacement Control/Hydraulic Displacement Control Neutral Adjustment...................................25
Minor repair
Standard procedures, removing the pump..........................................................................................................................27
Displacement limiter.....................................................................................................................................................................27
Pressure filtration adapter.......................................................................................................................................................... 28
Charge pump...................................................................................................................................................................................29
Shaft seal...........................................................................................................................................................................................31
SCR valves.........................................................................................................................................................................................32
Charge pressure relief valve.......................................................................................................................................................33
Bypass valve.....................................................................................................................................................................................34
Manual displacement control....................................................................................................................................................35
Electronic Displacement Control/Hydraulic Displacement Control............................................................................36
MDC orifice repair..........................................................................................................................................................................38
EDC/HDC orifice repair.................................................................................................................................................................39
Torque chart
Fastener size and torque chart..................................................................................................................................................41
Plug size and torque chart..........................................................................................................................................................41
Service Manual
Series 40 M46 Tandem Variable Pumps
Contents
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Danfoss | September 2017 11029852 | AX00000030en-US0202 | 3