Hitachi ZW 550-G Technical Manual page 9

Loading System .............................................................................................................................................. 42-23
Reducing Valve (for Pilot Pressure) ................................................................................................................ 42-24
Pilot Valve (S/N 0101~0140, 9001~9020) ....................................................................................................... 42-25
Pilot valve operation .................................................................................................................................. 42-27
Pilot valve detent magnet solenoid ........................................................................................................... 42-29
Detent adjustment procedure .................................................................................................................... 42-29
Pilot valve (S/N 0141~0172, 9021~) ............................................................................................................... 42-30
Pilot valve operation .................................................................................................................................. 42-32
Pre-detent and detent magnet solenoid .................................................................................................... 42-34
Pilot valve (S/N 0173~0176) ........................................................................................................................... 42-35
Pilot valve (S/N 0177~) ................................................................................................................................... 42-40
Multiple Control Valve (KML35A/2T103) ......................................................................................................... 42-45
Multiple control valve specifications .......................................................................................................... 42-46
Multiple control valve main relief valve ..................................................................................................... 42-47
Multiple control valve overload relief valve ............................................................................................... 42-49
Multiple control valve bucket spool ........................................................................................................... 42-52
Multiple control valve boom spool ............................................................................................................. 42-54
Adapter (Orifice) .............................................................................................................................................. 42-57
Vibration Damper (OPT) ................................................................................................................................. 42-58
Vibration damper operation ....................................................................................................................... 42-59
Vibration damper hydraulic line ................................................................................................................. 42-68
Steering System .............................................................................................................................................. 42-69
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Orbitrol .......................................................................................................................................................... 42-70
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Orbitrol structure ..................................................................................................................................... 42-70
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Orbitrol specifications .............................................................................................................................. 42-71
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Orbitrol operation .................................................................................................................................... 42-72
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Orbitrol feed-back mechanism operation ................................................................................................ 42-74
Steering speed and flow rate control ........................................................................................................ 42-75
Hydraulic pump oil amount and steering force .......................................................................................... 42-75
Orbit rotor operation principle ................................................................................................................... 42-76
Steering Valve (KVS32-A4.0/21) ..................................................................................................................... 42-77
Steering valve operation ........................................................................................................................... 42-79
Steering spool variable throttle ................................................................................................................. 42-81
Steering valve flow control spool .............................................................................................................. 42-82
Steering valve main relief valve ................................................................................................................ 42-83
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