Danfoss MP1 Manuals

Service Manual Variable Displacement Pumps MP1 www.danfoss.com Revision history Table of revisions Date Changed Rev April 2019 Updated for new control types 0201 October 2018 Corred sort strings on MDC and additional options to MDC illustration 0107 January 2018 update control current table 0106 November 2017 Add NFPE 0105 October 2017 Remove HDC 0104 July 2017 update ports and plugs 0103 April 2017 Add HDC 0102 August 2016 First edition 0101 Service Manual MP1 2 | © Danfoss | April 2019 AX00000244en-000201 Introduction Hydrostatics Servicing Overview................................................................................................................................................6 General instructions........................................................................................................................................................................ 6 Remove the unit..........................................................................................................................................................................6 Lubricate moving parts.............................................................................................................................................................6 Replace all O-rings and gaskets............................................................................................................................................. 6 Safety Precautions............................................................................................................................................................................7 Unintended Machine Movement..........................................................................................................................................7 Flammable Cleaning Solvents................................................................................................................................................7 Fluid Under Pressure..................................................................................................................................................................7 Personal Safety.............................................................................................................................................................................7 Symbols used in Danfoss literature............................................................................................................................................7 Technical specifications MP1 design specifications.............................................................................................................................................................9 MP1 technical data...........................................................................................................................................................................9 MP1 operating parameters.........................................................................................................................................................10 MP1 fluid specifications...............................................................................................................................................................10 Operation MP1 high pressure relief valve (HPRV) and charge check...............................................................................................11 Bypass Function..............................................................................................................................................................................11 MP1 charge pressure relief valve (CPRV) function.............................................................................................................12 Loop flushing valve.......................................................................................................................................................................13 Electrical displacement control (EDC).................................................................................................................................... 14 EDC principle..............................................................................................................................................................................14 EDC operation............................................................................................................................................................................14 Control Signal Requirements, EDC ....................................................................................................................................15 EDC Solenoid Data................................................................................................................................................................... 15 Control Response......................................................................................................................................................................16 MP1 EDC response time....................................................................................................................................................16 Manual Over Ride (MOR)........................................................................................................................................................16 Swash Plate Angle Sensor for EDC Controls.........................................................................................................................18 Swash Plate Angle Sensor Parameters (EDC)..................................................................................................................18 Swash Plate Angle Sensor Connector............................................................................................................................... 19 Interface with ECU (EDC)........................................................................................................................................................19 Manual displacement control....................................................................................................................................................19 MDC principle............................................................................................................................................................................ 19 MDC Operation..........................................................................................................................................................................21 MDC Shaft Rotation................................................................................................................................................................. 21 Control Response......................................................................................................................................................................22 MP1 MDC response time..................................................................................................................................................22 Neutral Start Switch (NSS)..................................................................................................................................................... 22 Case gauge port M14.............................................................................................................................................................. 23 Lever..............................................................................................................................................................................................24 Forward-neutral-reverse (FNR) electic control....................................................................................................................24 FNR principle..............................................................................................................................................................................24 Control Response......................................................................................................................................................................26 Response time, FNR............................................................................................................................................................27 Non Feedback Proportional Electric Control (NFPE).........................................................................................................27 Control Signal Requirements............................................................................................................................................... 28 Control Response......................................................................................................................................................................28 Response Time..................................................................................................................................................................... 29 Non-Feedback, Proportional Hydraulic (NFPH) Control.................................................................................................. 29 Control Response......................................................................................................................................................................30 Response Time..................................................................................................................................................................... 31 Control-Cut-Off valve (CCO valve)........................................................................................................................................... 32 CCO Solenoid Data...................................................................................................................................................................33 Brake gauge port with MDC................................................................................................................................................. 34 Displacement limiter.....................................................................................................................................................................34 Service Manual MP1 Contents © Danfoss | April 2019 AX00000244en-000201 | 3

Service Manual MP1 Axial Piston Motors Size 20/24 www.danfoss.com Revision history Table of revisions Date Changed Rev November 2020 Updated Part Option for Speed and Temperature Sensor 0104 March 2020 Changed number of the shuttle shifts to 4 bar 0103 December 2019 Changed torque units from N•m [lbf•ft] to N•m [lbf•in] 0102 December 2019 First edition 0101 Service Manual MP1 Motor 2 | © Danfoss | November 2020 AX323657269473en-000104 Introduction Hydrostatics Servicing Overview................................................................................................................................................5 Safety Precautions............................................................................................................................................................................5 Unintended Machine Movement..........................................................................................................................................5 Flammable Cleaning Solvents................................................................................................................................................5 Fluid Under Pressure..................................................................................................................................................................5 Personal Safety.............................................................................................................................................................................5 General Information MP1 Motors Overview.....................................................................................................................................................................6 MP1 Motor Features........................................................................................................................................................................ 6 System Diagram................................................................................................................................................................................7 Schematic Diagram..........................................................................................................................................................................8 Technical Specifications Design Specifications......................................................................................................................................................................9 Technical Data................................................................................................................................................................................... 9 Operating Parameters.....................................................................................................................................................................9 Fluid Specifications....................................................................................................................................................................... 10 System Design Parameters Determination of Nominal Motor Size................................................................................................................................... 11 Variables.......................................................................................................................................................................................11 Part Options Shaft Options...................................................................................................................................................................................12 Loop Flushing Valve......................................................................................................................................................................12 Anti-Cavitation and Shock Valve..............................................................................................................................................14 Speed and Temperature Sensor...............................................................................................................................................15 Available Sensors......................................................................................................................................................................15 Sensor Position..........................................................................................................................................................................16 Speed Sensor 4.5 - 8 V.............................................................................................................................................................16 Speed Sensor 7 - 32 V..............................................................................................................................................................17 Output Pulses.............................................................................................................................................................................17 Operating Parameters Overview........................................................................................................................................................................................... 18 Speed Ratings..................................................................................................................................................................................18 System Pressure..............................................................................................................................................................................18 Case Pressure...................................................................................................................................................................................19 Temperature....................................................................................................................................................................................19 Viscosity.............................................................................................................................................................................................19 Pressure Measurements SAE A Flange Port Locations and Specifications.................................................................................................................20 SAE B Flange Port Locations and Specifications.................................................................................................................21 Cartridge Flange Port Locations and Specifications......................................................................................................... 22 Fluid and Filter Maintenance Recommendations of Fluid and Filter Maintenance.........................................................................................................23 Initial Start-Up Procedures Start-up Safety Precautions........................................................................................................................................................24 Inspect the Unit.............................................................................................................................................................................. 24 Fill System Components with Hydraulic Fluid.....................................................................................................................24 Install Charge Pressure Gauge...................................................................................................................................................25 Calibrate the Motor/Transmission...........................................................................................................................................25 Troubleshooting Troubleshooting Overview.........................................................................................................................................................26 System Operating Hot..................................................................................................................................................................26 System Noise or Vibration...........................................................................................................................................................26 Minor Repair Service Manual MP1 Motor Contents © Danfoss | November 2020 AX323657269473en-000104 | 3 Shaft Seal and Dust Seal..............................................................................................................................................................27 Shaft seal and dust seal removal.........................................................................................................................................27 Shaft Seal and Dust Seal Assembly.................................................................................................................................... 28 Speed Sensor...................................................................................................................................................................................29 Speed Sensor Removal...........................................................................................................................................................29 Speed Sensor Assembly......................................................................................................................................................... 29 Loop Flushing Valve......................................................................................................................................................................30 Loop Flushing Valve Removal..............................................................................................................................................30 Inspect the Components....................................................................................................................................................... 30 Install the Loop Flushing Valve............................................................................................................................................30 Anti-cavitation Valve.....................................................................................................................................................................31 Remove the Anti-cavitation Valve (Supply Check Relief Valve)...............................................................................31 Inspect the Components....................................................................................................................................................... 31 Install the Anti-cavitation Valve...........................................................................................................................................31 Torque Chart Fasteners and Torque...................................................................................................................................................................32 Service Manual MP1 Motor Contents 4 | © Danfoss | November 2020 AX323657269473en-000104