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
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Danfoss | April 2019 AX00000244en-000201 | 3
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