Introduction
Overview..............................................................................................................................................................................................5
Ordering replacement parts and service.................................................................................................................................5
Safety precautions............................................................................................................................................................................5
Symbols used in Danfoss literature............................................................................................................................................6
General instructions........................................................................................................................................................................ 7
Keep it clean..................................................................................................................................................................................7
Inspect for system contamination........................................................................................................................................ 7
Replace the O-rings and gaskets...........................................................................................................................................7
Lubricate all moving parts.......................................................................................................................................................7
Torque procedure.......................................................................................................................................................................7
Variable displacement motors.....................................................................................................................................................7
Series 51-1 motors............................................................................................................................................................................8
Closed circuit......................................................................................................................................................................................9
Open circuit......................................................................................................................................................................................10
Shafts..................................................................................................................................................................................................11
Operation
Loop flushing...................................................................................................................................................................................12
Displacement limiters...................................................................................................................................................................13
Mounting configurations............................................................................................................................................................14
Speed sensors..................................................................................................................................................................................16
Controls............................................................................................................................................................................................. 17
Overview......................................................................................................................................................................................17
Two-position controls.................................................................................................................................................................. 17
Pressure-compensator controls................................................................................................................................................19
Proportional controls....................................................................................................................................................................20
Technical specifications
General specifications.................................................................................................................................................................. 21
Technical data................................................................................................................................................................................. 21
Fluid specifications........................................................................................................................................................................22
Pressure measurements
Required tools.................................................................................................................................................................................23
Port locations and gauge installation.....................................................................................................................................23
Fluid and filter maintenance
Fluid and filter recommendations........................................................................................................................................... 26
Hazardous material..................................................................................................................................................................26
Initial startup procedures
Procedure..........................................................................................................................................................................................27
Troubleshooting
Sluggish system..............................................................................................................................................................................29
System operating hot...................................................................................................................................................................29
Excessive noise or vibration.......................................................................................................................................................29
Motor operates normally in one direction only..................................................................................................................30
Improper output speed............................................................................................................................................................... 30
Low output torque........................................................................................................................................................................ 30
Adjustments
Overview........................................................................................................................................................................................... 32
Charge pressure relief valve..................................................................................................................................................32
Measuring charge pressure...................................................................................................................................................32
Adjusting charge pressure.................................................................................................................................................... 32
Minimum displacement limiter................................................................................................................................................ 33
Adjusting minimum displacement.................................................................................................................................... 33
Maximum displacement limiter................................................................................................................................................35
Series 51 motors .......................................................................................................................................................................36
Series 51-1 motors ...................................................................................................................................................................36
Service Manual
Series 51 and 51-1 Motors
Contents
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Danfoss | March 2016 11008567 | AX00000013en-US0202 | 3
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