Speed sensor installation and adjustment........................................................................................................................... 37
DIN and SAE flange units ......................................................................................................................................................37
Cartridge units...........................................................................................................................................................................39
Minor repair
Shaft seal replacement.................................................................................................................................................................40
SAE and DIN flanged motors................................................................................................................................................40
Disassembly...........................................................................................................................................................................40
Inspection.............................................................................................................................................................................. 40
Reassembly............................................................................................................................................................................40
Cartridge flanged motors...................................................................................................................................................... 41
Disassembly...........................................................................................................................................................................41
Inspection.............................................................................................................................................................................. 41
Reassembly............................................................................................................................................................................42
Loop flushing shuttle valve........................................................................................................................................................42
Disassembly................................................................................................................................................................................42
Inspection....................................................................................................................................................................................43
Reassembly.................................................................................................................................................................................43
Charge relief valve.........................................................................................................................................................................44
Overview......................................................................................................................................................................................44
Poppet style (older production)..........................................................................................................................................44
Disassembly...........................................................................................................................................................................44
Inspection.............................................................................................................................................................................. 44
Reassembly............................................................................................................................................................................44
Orificed style...............................................................................................................................................................................45
Disassembly...........................................................................................................................................................................45
Inspection.............................................................................................................................................................................. 46
Reassembly............................................................................................................................................................................46
Defeat plug................................................................................................................................................................................. 46
Disassembly...........................................................................................................................................................................46
Inspection.............................................................................................................................................................................. 46
Reassembly............................................................................................................................................................................46
Maximum angle stop - Series 51 motors...............................................................................................................................47
Disassembly................................................................................................................................................................................47
Inspection....................................................................................................................................................................................48
Reassembly.................................................................................................................................................................................49
Maximum angle stop - Series 51-1 motors...........................................................................................................................49
Disassembly................................................................................................................................................................................49
Inspection....................................................................................................................................................................................50
Reassembly.................................................................................................................................................................................50
Minimum angle adjustment screw..........................................................................................................................................51
Disassembly................................................................................................................................................................................51
Inspection....................................................................................................................................................................................51
Reassembly.................................................................................................................................................................................52
4-Way valve and threshold springs......................................................................................................................................... 52
4-Way valve.................................................................................................................................................................................52
Disassembly...........................................................................................................................................................................52
Inspection.............................................................................................................................................................................. 54
Reassembly............................................................................................................................................................................54
Threshold adjustment screw and springs........................................................................................................................54
Disassembly...........................................................................................................................................................................54
Inspection.............................................................................................................................................................................. 56
Reassembly............................................................................................................................................................................57
Assembling the 4-way valve.................................................................................................................................................57
Service Manual
Series 51 and 51-1 Motors
Contents
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Danfoss | March 2016 11008567 | AX00000013en-US0202
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