Hitachi 225USLC-6 225USRLC-6 Hydraulic Excavator Operational Principle Technical Manual
File Details:
Hitachi 225USLC-6 225USRLC-6 Hydraulic Excavator Operational Principle Technical Manual
- Manual Language:English
- Pages: 487
- Size: 30.8 MB
- Downloadable:Yes
- Format:PDF
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Description:
Hitachi 225USLC-6 225USRLC-6 Hydraulic Excavator Operational Principle Technical Manual
TO THE READER
This manual is written for an experienced technician to provide technical information needed to maintain and repair this machine. The machine specification and description according to destination may be explained on this manual.
• Be sure to thoroughly read this manual for correct product information and service procedures.
• If you have any questions or comments, at if you found any errors regarding the contents of this manual, please contact using “Service Manual Revision Request Form” at the end of this manual.
ADDITIONAL REFERENCES
Please refer to the other materials (operator’s manual, parts catalog, engine technical material and Hitachi training material etc.) in addition to this manual.
MANUAL COMPOSITION
This manual consists the Technical Manual and the Workshop Manual.
• Information included in the Technical Manual: technical information needed for redelivery and delivery, operation and activation of all devices and systems, operational performance tests, and troubleshooting procedures.
• Information included in the Workshop Manual: technical information needed for maintenance and repair of the machine, tools and devices needed for maintenance and repair, maintenance standards, and removal/installation and assemble/ disassemble procedures.
Table Of Contents:
Hitachi 225USLC-6 225USRLC-6 Hydraulic Excavator Operational Principle Technical Manual
TODFB50-EN-00................................................................................................. 1 CONTENTS ................................................................................................. 3 INTRODUCTION.............................................................................................. 9 To The Reader......................................................................................... 9 Additional References................................................................................. 9 Manual Composition.................................................................................... 9 Page Number........................................................................................... 9 Trademark............................................................................................. 9 Safety Alert Symbol and Headline Notations............................................................ 10 Units Used............................................................................................ 10 SYMBOL AND ABBREVIATION................................................................................... 11 SECTION AND GROUP CONTENTS................................................................................ 13 SECTION 1 GENERAL......................................................................................... 15 Group 1 Specifications................................................................................ 17 Specifications.................................................................................... 17 Working Ranges (Grouser shoe)..................................................................... 21 Group 2 Component Layout.............................................................................. 25 Main Component.................................................................................... 25 Electrical System (Overview)...................................................................... 29 Electrical System (Rear Tray)..................................................................... 30 Electrical System (Switch Panel).................................................................. 31 Electrical System (Utility Space)................................................................. 32 Electrical System (Relays)........................................................................ 33 Engine............................................................................................ 34 Aftertreatment Device............................................................................. 35 Pump Device....................................................................................... 36 Around Pump Device................................................................................ 38 Control Valve/Signal Control Valve................................................................ 39 Swing Device...................................................................................... 41 Travel Device..................................................................................... 41 5-Spool Solenoid Valve Unit....................................................................... 42 2-Spool Solenoid Valve Unit (Pilot Pressure Control (Pump 3 Flow Rate Control))................... 42 2-Spool Solenoid Valve Unit (Aftertreatment Device Regeneration Control).......................... 42 DEF Tank.......................................................................................... 43 DEF Supply Module................................................................................. 43 Layout of Attachment Spec. Parts.................................................................. 44 Components Related with Breaker................................................................... 45 Group 3 Component Specifications...................................................................... 49 Engine............................................................................................ 49 Engine Accessories................................................................................ 53 Hydraulic Component............................................................................... 54 Electrical Component.............................................................................. 58 Optional Parts.................................................................................... 59 SECTION 2 SYSTEM.......................................................................................... 65 Group 1 Controller.................................................................................... 67 Outline........................................................................................... 67 CAN Circuit....................................................................................... 68 Group 2 Control System................................................................................ 71 Outline........................................................................................... 71 Engine Control.................................................................................... 74 Pump Control......................................................................................106 Valve Control (Standard)..........................................................................130 Valve Control (Optional)..........................................................................148 Other Control.....................................................................................158 Group 3 Engine System.................................................................................169 ECM System........................................................................................169 Fuel Injection Control............................................................................170 Fuel Injection Amount Correction Control..........................................................178 EGR Control.......................................................................................180 Preheating Control................................................................................182 Variable Turbocharger Control.....................................................................183 Alarm Control.....................................................................................184 Urea SCR System...................................................................................185 Engine Output Restriction Control (INDUCEMENT)....................................................196 Aftertreatment Device.............................................................................200 Aftertreatment Device Regeneration Control........................................................202 Group 4 Hydraulic System..............................................................................205 Outline...........................................................................................205 Pilot Circuit.....................................................................................206 Main Circuit......................................................................................218 Blade/Breaker/Pulverizer/Crusher Circuit (Option).................................................240 Blade Circuit.....................................................................................242 Group 5 Electrical System.............................................................................253 Outline...........................................................................................253 Main Circuit......................................................................................254 Electric Power Circuit (Key Switch: OFF)..........................................................256 CAN Circuit.......................................................................................258 Accessory Related Circuit (Key Switch: ACC).......................................................260 Starting Circuit (Key Switch: START)..............................................................262 Charging Circuit (Key Switch: ON).................................................................264 Surge Voltage Prevention Circuit..................................................................268 Pilot Shut-Off Circuit (Key Switch: ON)...........................................................270 Auto Shut-Down Circuit/Automatic Engine Stop Circuit at Low Temperature...........................272 Engine Stop Circuit...............................................................................274 Monitor Circuit...................................................................................277 Security Circuit..................................................................................278 Radio Circuit.....................................................................................280 Air Conditioner Circuit...........................................................................280 Accessory Circuit.................................................................................283 Work Light Circuit................................................................................284 Wiper/Washer Circuit..............................................................................286 Cab Light Circuit.................................................................................288 SECTION 3 COMPONENT OPERATION.............................................................................293 Group 1 Pump Device...................................................................................295 Outline...........................................................................................295 Main Pump.........................................................................................296 Regulator.........................................................................................300 Solenoid Valve....................................................................................324 Pilot Pump, Blade Pump (Option)...................................................................326 Pump Delivery Pressure Sensor.....................................................................326 Pump Control Pressure Sensor......................................................................326 Group 2 Swing Device..................................................................................327 Outline...........................................................................................327 Swing Reduction Gear..............................................................................328 Swing Motor.......................................................................................329 Swing Parking Brake...............................................................................330 Valve Unit........................................................................................332 Group 3 Control Valve.................................................................................345 Outline...........................................................................................345 Hydraulic Circuit.................................................................................368 Flow Combiner Valve...............................................................................374 Main Relief Valve.................................................................................376 Overload Relief Valve (with Make-Up Function).....................................................380 Regenerative Valve................................................................................384 Anti-Drift Valve..................................................................................394 Flow Rate Control Valve...........................................................................398 Digging Regenerative Valve........................................................................402 Boom Lower Meter-In Cut Valve.....................................................................404 Auxiliary Flow Combiner Valve and Bypass Shut-Out Valve...........................................406 Blade Control Valve (Option)......................................................................410 Blade Circuit (Option)............................................................................412 Group 4 Pilot Valve...................................................................................415 Outline...........................................................................................415 Operation (Front Attachment/Swing and Travel Pilot Valves)........................................417 Operation (Auxiliary, Blade, Positioning Pilot Valves)............................................425 Shockless Function (Only for Travel Pilot Valve)..................................................430 Group 5 Travel Device.................................................................................431 Outline...........................................................................................431 Travel Reduction Gear.............................................................................432 Travel Motor......................................................................................434 Parking Brake.....................................................................................436 Travel Brake Valve................................................................................438 Overload Relief Valve.............................................................................442 Travel Mode Control...............................................................................444 Group 6 Signal Control Valve..........................................................................449 Outline...........................................................................................449 Pilot Port........................................................................................450 Shuttle Valve.....................................................................................455 Shockless Valve...................................................................................458 Pump 1 Flow Rate Control Valve, Pump 2 Flow Rate Control Valve, Pump 3 Flow Rate Control Valve....462 Flow Combiner Valve Control Spool, Swing Parking Brake Release Spool..............................464 Group 7 Others (Upperstructure).......................................................................465 Pilot Shut-Off Solenoid Valve.....................................................................465 Solenoid Valve....................................................................................467 Hose Rupture Valve................................................................................472 Pilot Relief Valve................................................................................478 Recirculation Valve...............................................................................479 Group 8 Others (Undercarriage)........................................................................481 Swing Bearing.....................................................................................481 Centerjoint.......................................................................................482 Machine with Blade (Option) Equipped..............................................................483 Track Adjuster (Front Idler Integrated Type)......................................................484 SERVICE MANUAL REVISION REQUEST FORM......................................................................487
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