Hitachi 250LC-5B 250LCN-5B Hydraulic Excavator Operational Principle Technical Manual
File Details:
Hitachi 250LC-5B 250LCN-5B Hydraulic Excavator Operational Principle Technical Manual
- Manual Language:English
- Pages: 440
- Size: 10.4 MB
- Downloadable:Yes
- Format:PDF
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Description:
Hitachi 250LC-5B 250LCN-5B 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 250LC-5B 250LCN-5B Hydraulic Excavator Operational Principle Technical Manual
TODCA-EN-01 .................................................................................................. 1 INTRODUCTION.................................................................................................. 3 SYMBOL AND ABBREVIATION....................................................................................... 5 SECTION AND GROUP CONTENTS.................................................................................... 7 SECTION 1 GENERAL............................................................................................. 9 Group 1 Specifications.................................................................................... 11 Specifications........................................................................................ 11 Working Ranges........................................................................................ 12 Group 2 Component Layout.................................................................................. 13 Main Component........................................................................................ 13 Electrical System (Overview).......................................................................... 15 Electrical System (Rear Tray)......................................................................... 16 Electrical System (Switch Panel)...................................................................... 17 Electrical System (Components Related with Air Cleaner)............................................... 18 Electrical System (Relays)............................................................................ 19 Engine................................................................................................ 20 Muffler Filter........................................................................................ 21 Pump Device........................................................................................... 22 Around Pump Device.................................................................................... 23 Control Valve......................................................................................... 24 Signal Control Valve.................................................................................. 24 Swing Device.......................................................................................... 26 Travel Device......................................................................................... 26 5-Spool Solenoid Valve Unit........................................................................... 27 2-Spool Solenoid Valve Unit (Muffler Filter Regeneration Control)..................................... 27 Layout of Attachment Spec. Parts...................................................................... 28 Group 3 Component Specifications.......................................................................... 33 Engine................................................................................................ 33 Engine Accessories.................................................................................... 37 Hydraulic Component................................................................................... 38 Electrical Component.................................................................................. 42 SECTION 2 SYSTEM.............................................................................................. 45 Group 1 Controller........................................................................................ 47 Outline............................................................................................... 47 CAN Circuit........................................................................................... 48 Group 2 Control System.................................................................................... 51 Outline............................................................................................... 51 Engine Control........................................................................................ 54 Pump Control.......................................................................................... 88 Valve Control (Standard)..............................................................................104 Valve Control (Optional)..............................................................................124 Other Control.........................................................................................134 Group 3 ECM System........................................................................................145 Outline...............................................................................................145 Fuel Injection Control................................................................................146 Fuel Injection Amount Correction Control..............................................................154 EGR Control...........................................................................................156 Preheating Control....................................................................................158 Alarm Control.........................................................................................159 Muffler Filter........................................................................................160 Operation.............................................................................................161 Muffler Filter Regenerative Control...................................................................162 Group 4 Hydraulic System..................................................................................165 Outline...............................................................................................165 Pilot Circuit.........................................................................................166 Main Circuit..........................................................................................178 Breaker/Pulverizer/Crusher Circuit (Optional).........................................................200 Group 5 Electrical System.................................................................................211 Outline...............................................................................................211 Main Circuit..........................................................................................212 Electric Power Circuit (Key Switch: OFF)..............................................................214 CAN Circuit...........................................................................................216 Accessory Circuit.....................................................................................218 Starting Circuit (Key Switch: START)..................................................................220 Charging Circuit (Key Switch: ON).....................................................................222 Surge Voltage Prevention Circuit......................................................................226 Pilot Shut-Off Circuit (Key Switch: ON)...............................................................228 Auto Shut-Down Circuit/Automatic Engine Stop Circuit at Low Temperature...............................230 Engine Stop Circuit...................................................................................232 Monitor Circuit.......................................................................................235 Security Circuit......................................................................................236 Radio Circuit.........................................................................................238 Air Conditioner Circuit...............................................................................238 Accessory Circuit.....................................................................................241 Work Light Circuit....................................................................................242 Wiper/Washer Circuit..................................................................................244 Cab Light Circuit.....................................................................................246 SECTION 3 COMPONENT OPERATION.................................................................................251 Group 1 Pump Device.......................................................................................253 Outline...............................................................................................253 Main Pump.............................................................................................254 Regulator.............................................................................................258 Solenoid Valve........................................................................................280 Pilot Pump............................................................................................282 Pump Delivery Pressure Sensor.........................................................................282 Pump Control Pressure Sensor..........................................................................282 Group 2 Swing Device......................................................................................283 Outline...............................................................................................283 Swing Reduction Gear..................................................................................284 Swing Motor...........................................................................................285 Swing Parking Brake...................................................................................286 Valve Unit............................................................................................288 Group 3 Control Valve.....................................................................................301 Outline...............................................................................................301 Hydraulic Circuit.....................................................................................324 Flow Combiner Valve...................................................................................330 Main Relief Valve.....................................................................................332 Overload Relief Valve (with Make-Up Function).........................................................336 Regenerative Valve....................................................................................340 Anti-Drift Valve......................................................................................350 Flow Rate Control Valve...............................................................................354 Digging Regenerative Valve............................................................................358 Boom Lower Meter-In Cut Valve.........................................................................360 Auxiliary Flow Combiner Valve and Bypass Shut-Out Valve...............................................362 Group 4 Pilot Valve.......................................................................................367 Outline...............................................................................................367 Operation (Front Attachment / Swing and Travel Pilot Valves)..........................................369 Operation (Auxiliary / Positioning Pilot Valve).......................................................377 Shockless Function (Only for Travel Pilot Valve)......................................................382 Group 5 Travel Device.....................................................................................383 Outline...............................................................................................383 Travel Reduction Gear.................................................................................384 Travel Motor..........................................................................................386 Parking Brake.........................................................................................388 Travel Brake Valve....................................................................................390 Overload Relief Valve.................................................................................394 Travel Mode Control...................................................................................396 Group 6 Signal Control Valve..............................................................................401 Outline...............................................................................................401 Pilot Port............................................................................................402 Shuttle Valve.........................................................................................407 Shockless Valve.......................................................................................410 Pump 1 Flow Rate Control Valve, Pump 2 Flow Rate Control Valve, and Pump 3 Flow Rate Control Valve....414 Flow Combiner Valve Control Spool, Swing Parking Brake Release Spool..................................416 Group 7 Others (Upperstructure)...........................................................................417 Pilot Shut-Off Solenoid Valve.........................................................................417 Solenoid Valve........................................................................................419 Hose Rupture Valve....................................................................................424 Pilot Relief Valve....................................................................................430 Recirculation Valve (Option)..........................................................................431 Group 8 Others (Undercarriage)............................................................................433 Swing Bearing.........................................................................................433 Center Joint..........................................................................................434 Track Adjuster (Front Idler Integrated Type)..........................................................435 SERVICE MANUAL REVISION REQUEST FORM..........................................................................439
Please Note:
⦁ This is the SAME manual used by the dealers to troubleshoot any faults in your vehicle. This can be yours in 2 minutes after the payment is made.
⦁ Contact us at [email protected] should you have any queries before your purchase or that you need any other service / repair / parts operators manual.
Van Maximus –
Abdul –
HITACHI 250LC-5B 250LCN-5B HYDRAULIC EXCAVATOR OPERATIONAL PRINCIPLE TECHNICAL MANUAL
Worth the money!