Danfoss 51 Series Service Manual page 4

Service Manual
Series 51 and 51-1 Motors
Contents
Minor repair
4 | © Danfoss | March 2016
Speed sensor installation and adjustment........................................................................................................................... 37
DIN and SAE flange units ...................................................................................................................................................... 37
Cartridge units........................................................................................................................................................................... 39
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
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