Table Of Contents - Danfoss OSQA Service Manual

Service Manual
OSQA/OSQB
Contents
Introduction
Technical specifications
Disassembly
Assembly
Testing
© Danfoss | July 2016
Safety precautions............................................................................................................................................................................4
Symbols used in this literature.................................................................................................................................................... 4
OSQ versions...................................................................................................................................................................................... 5
Exploded view................................................................................................................................................................................... 6
Parts list................................................................................................................................................................................................ 6
OSQA and OSQB parts list........................................................................................................................................................ 6
OSQ spare parts list.................................................................................................................................................................... 8
Tools...................................................................................................................................................................................................... 8
Dismantling counter pressure valve..........................................................................................................................................9
Removing pressure relief valve ................................................................................................................................................11
Removing end cover at PP-connection................................................................................................................................. 12
Removing end cover at LS-connection..................................................................................................................................13
Unscrew orifices, throttle check valve....................................................................................................................................16
Housing and end cover with accessories.............................................................................................................................. 16
Spools with accessories............................................................................................................................................................... 17
Dismantling directional spool................................................................................................................................................... 17
Priority valve spool number of orifices...................................................................................................................................17
Dismantling priority valve spool.............................................................................................................................................. 18
Dismantling amplifier spool.......................................................................................................................................................19
Shock and suction valves............................................................................................................................................................ 23
Cleaning............................................................................................................................................................................................ 24
Inspection and replacement......................................................................................................................................................24
Lubrication....................................................................................................................................................................................... 24
Assembling shock, suction, and check valve....................................................................................................................... 25
Assembling amplifier spool........................................................................................................................................................26
Assembling priority valve spool............................................................................................................................................... 28
Assembling directional spool.................................................................................................................................................... 29
Installing orifice and throttle check valve............................................................................................................................. 29
Installing shock valves..................................................................................................................................................................30
Assembling pressure relief valve..............................................................................................................................................31
Installing OSQB back pressure valve.......................................................................................................................................32
Installing spools..............................................................................................................................................................................33
Installing PP end cover.................................................................................................................................................................34
Installing LS end cover................................................................................................................................................................. 37
Plastic plugs..................................................................................................................................................................................... 39
Set-up for testing........................................................................................................................................................................... 40
Steering test using steering unit type OSPBX LS................................................................................................................40
Pilot relief valve...............................................................................................................................................................................41
Neutral positioning....................................................................................................................................................................... 41
Manual steering test..................................................................................................................................................................... 41
HN25D293 | AX00000127en-US0101 | 3