Hitachi ZX350LC-6 ZX350LCN-6 Hydraulic Excavator Technical Workshop Manual (WDDQ50-EN-00)
File Details:
Hitachi ZX350LC-6 ZX350LCN-6 Hydraulic Excavator Technical Workshop Manual (WDDQ50-EN-00)
- Manual Language:English
- Pages: 647
- Size: 12.5 MB
- Format:PDF
- Downloadable:Yes
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Description:
Hitachi ZX350LC-6 ZX350LCN-6 Hydraulic Excavator Technical Workshop Manual (WDDQ50-EN-00)
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, the Workshop Manual and the Engine 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.
Information included in the Engine Manual: Technical information needed for redelivery and delivery and maintenance and repair of the machine, operation and activation of all devices and systems, troubleshooting and assemble / disassemble procedures.
Table Of Contents:
Hitachi ZX350LC-6 ZX350LCN-6 Hydraulic Excavator Technical Workshop Manual (WDDQ50-EN-00)
WDDQ50-EN-00........................................................................... 1 CONTENTS........................................................................... 3 SECTION 1GENERAL............................................................... 3 SECTION 2MAINTENANCE STANDARD.................................................. 5 SECTION 3UPPERSTRUCTURE........................................................ 7 SECTION 4UNDERCARRIAGE......................................................... 9 SECTION 5FRONT ATTACHMENT...................................................... 11 INTRODUCTION....................................................................... 13 Additional References.......................................................... 13 Manual Composition............................................................. 13 Page Number.................................................................... 13 Trademark...................................................................... 13 Safety Alert Symbol and Headline Notations..................................... 14 Units Used..................................................................... 14 SYMBOL AND ABBREVIATION............................................................ 16 SAFETY............................................................................. 17 Recognize Safety Information................................................... 17 Understand Signal Words........................................................ 17 Follow Safety Instructions..................................................... 18 Prepare for Emergencies........................................................ 19 Wear Protective Clothing....................................................... 19 Protect Against Noise.......................................................... 20 Inspect Machine................................................................ 20 General Precautions for the Cab................................................ 21 Use Handholds and Steps........................................................ 22 Adjust the Operator's Seat..................................................... 22 Ensure Safety Before Rising from or Leaving Operator’s Seat.................... 23 Fasten Your Seat Belt.......................................................... 23 Move and Operate Machine Safely................................................ 24 Operate Only from Operator's Seat.............................................. 24 Jump Starting.................................................................. 25 Keep Riders off Machine........................................................ 25 Precautions for Operations..................................................... 26 Investigate Job Site Beforehand................................................ 27 Install OPG Guard.............................................................. 28 Restriction of Attachment Installation......................................... 28 Provide Signals for Jobs Involving Multiple Machines........................... 29 Confirm Direction of Machine to Be Driven...................................... 29 Drive Machine Safely........................................................... 30 Avoid Injury from Rollaway Accidents........................................... 32 Avoid Injury from Back-Over and Swing Accidents................................ 33 Keep People Clear from Working Area............................................ 34 Never Position the Bucket Over Anyone.......................................... 34 Avoid Undercutting............................................................. 35 Avoid Tipping.................................................................. 35 Never Undercut a High Bank..................................................... 36 Dig with Caution............................................................... 36 Operate with Caution........................................................... 36 Avoid Power Lines.............................................................. 37 Precautions for Lightning...................................................... 37 Object Handling................................................................ 38 Protect Against Flying Debris.................................................. 38 Park Machine Safely............................................................ 39 Handle Fluids Safely−Avoid Fires............................................... 39 Transport Safely............................................................... 40 Practice Safe Maintenance...................................................... 41 Warn Others of Service Work.................................................... 42 Support Machine Properly....................................................... 42 Stay Clear of Moving Parts..................................................... 43 Prevent Parts from Flying...................................................... 43 Avoid Injury from Attachment Falling Accident.................................. 44 Prevent Burns.................................................................. 44 Replace Rubber Hoses Periodically.............................................. 45 Avoid High-Pressure Fluids..................................................... 45 Prevent Fires.................................................................. 46 Evacuating in Case of Fire..................................................... 48 Precautions for Welding and Grinding........................................... 49 Avoid Heating Near Pressurized Fluid Lines..................................... 50 Avoid Applying Heat to Lines Containing Flammable Fluids....................... 50 Precautions for Handling Accumulator and Gas Damper............................ 50 Remove Paint Before Welding or Heating......................................... 51 Beware of Asbestos and Silica Dust and Other Contamination..................... 51 Prevent Battery Explosions..................................................... 52 Service Air Conditioning System Safely......................................... 52 Handle Chemical Products Safely................................................ 53 Dispose of Waste Properly...................................................... 53 Never Ride Attachment.......................................................... 54 Notes on Aftertreatment Device................................................. 54 Precautions for Communication Terminal......................................... 54 Precautions for Communication Terminal Equipment............................... 55 Notes on Protection of Operator’s Station when the Machine Rolls Over.......... 57 Before Returning the Machine to the Customer................................... 58 SECTION AND GROUP CONTENTS......................................................... 59 SECTION 1GENERAL................................................................... 65 Group 1 Precautions for Disassembling and Assembling........................... 67 Precautions for Disassembling and Assembling............................... 67 Group 2 Tightening............................................................. 73 Tightening Bolts and Nuts.................................................. 73 Piping Joint............................................................... 76 Group 3 Painting............................................................... 83 Painting................................................................... 83 Group 4 Bleeding Air........................................................... 85 Bleeding Air from Hydraulic System......................................... 85 Bleeding Air from Fuel System.............................................. 86 Air Bleeding from the Diesel Exhaust Fluid Defrosting Piping............... 88 Group 5 Preparation............................................................ 89 Preparation before Inspection and Maintenance.............................. 89 Hydraulic Circuit Pressure Release Procedure............................... 91 Pressure Release from Hydraulic Oil Tank................................... 92 Pressure Release from Expansion Tank....................................... 93 SECTION 2 MAINTENANCE STANDARD..................................................... 97 Group 1 Upperstructure......................................................... 99 Pump Device................................................................ 99 Swing Motor................................................................103 Group 2 Undercarriage..........................................................107 Travel Motor...............................................................107 Sprocket...................................................................109 Front Idler................................................................111 Upper Roller...............................................................113 Lower Roller...............................................................114 Track......................................................................115 Group 3 Front Attachment.......................................................119 Pin and Bushing............................................................119 Side Cutter (2021232, 2021233).............................................121 Point (4512365)............................................................122 Side Cutter (4435856, 4435857).............................................123 Point (4400253)............................................................123 Standard Dimensions for Arm and Bucket Connection..........................124 Standard Dimensions for Arm and Boom Connection............................125 Cylinder...................................................................127 SECTION 3 UPPERSTRUCTURE...........................................................131 Group 1 Cab....................................................................133 Removal and Installation of Cab............................................133 Group 2 Counterweight..........................................................179 Removal and Installation of Counterweight..................................179 Group 3 Main Frame.............................................................183 Removal and Installation of Main Frame.....................................183 Group 4 Engine.................................................................191 Removal and Installation of Engine.........................................191 Group 8 Pump Device............................................................227 Removal and Installation of Pump Device....................................227 Removal and Installation of Coupling.......................................239 Disassembly of Pump Device.................................................241 Assembly of Pump Device....................................................249 Disassembly of Regulator...................................................261 Assembly of Regulator......................................................263 Disassembly of Solenoid Valve Unit........................................265 Assembly of Solenoid Valve Unit ...........................................267 Structure of Pilot Pump....................................................269 Group 9 Control Valve..........................................................271 Removal and Installation of Control Valve..................................271 Group 10 Swing Device..........................................................295 Removal and Installation of Swing Device...................................295 Disassembly of Swing Reduction Gear........................................299 Assembly of Swing Reduction Gear...........................................305 Disassembly of Swing Motor.................................................311 Assembly of Swing Motor....................................................314 Structure of Swing Parking Brake Selection Valve...........................317 Group 11 Pilot Valve...........................................................319 Removal and Installation of Pilot Valve (Left).............................319 Removal and Installation of Pilot Valve (Right)............................331 Removal and Installation of Travel Pilot Valve.............................347 Disassembly of Pilot Valves (Right and Left)...............................351 Assembly of Pilot Valves (Right and Left)..................................354 Disassembly of Travel Pilot Valve..........................................357 Assembly of Travel Pilot Valve.............................................361 Group 12 Solenoid Valve........................................................367 Removal and Installation of Pilot Shut-Off Solenoid Valve..................367 Removal and Installation of 5-Spool Solenoid Valve Unit....................371 Removal and Installation of 2-Spool Solenoid Valve Unit....................375 Disassembly of Pilot Shut-Off Solenoid Valve...............................379 Assembly of Pilot Shut-Off Solenoid Valve..................................381 Structure of 5-Spool Solenoid Valve Unit...................................383 Structure of 2-Spool Solenoid Valve Unit...................................385 Group 13 Signal Control Valve..................................................387 Removal and Installation of Signal Control Valve...........................387 Structure of Signal Control Valve..........................................391 Group 14 Aftertreatment Device.................................................395 Removal and Installation of Aftertreatment Device..........................395 Group 15 DEF Tank..............................................................417 Removal and Installation of DEF Tank.......................................417 Group 16 Coolant Control Valve.................................................431 Removal and Installation of Coolant Control Valve..........................431 Group 17 DEF Supply Module.....................................................433 Removal and Installation of DEF Supply Module..............................433 Group 18 Fan Pump..............................................................439 Removal and Installation of Fan Pump.......................................439 Structure of Fan Pump......................................................445 Group 19 Fan Valve.............................................................447 Removal and Installation of Fan Valve......................................447 Structure of Fan Valve.....................................................451 Structure of Solenoid Valve................................................453 Group 20 Fan Motor.............................................................455 Removal and Installation of Fan Motor......................................455 Structure of Fan Motor.....................................................463 SECTION 4 UNDERCARRIAGE............................................................467 Group 1 Swing Bearing..........................................................469 Removal and Installation of Swing Bearing..................................469 Disassembly of Swing Bearing...............................................475 Assembly of Swing Bearing..................................................478 Group 2 Travel Device..........................................................481 Removal and Installation of Travel Device..................................481 Disassembly of Travel Device...............................................485 Assembly of Travel Device..................................................489 Disassembly of Travel Motor................................................497 Assembly of Travel Motor...................................................500 Disassembly of Brake Valve.................................................505 Assembly of Brake Valve....................................................507 Group 3 Center Joint...........................................................511 Removal and Installation of Center Joint...................................511 Disassembly of Center Joint................................................515 Assembly of Center Joint...................................................517 Replacement of Body and Spindle............................................520 Group 4 Track Adjuster.........................................................521 Removal and Installation of Track Adjuster.................................521 Disassembly of Front Idler.................................................525 Assembly of Front Idler....................................................528 Disassembly of Track Adjuster..............................................531 Assembly of Track Adjuster.................................................535 Group 6 Upper and Lower Rollers................................................541 Removal and Installation of Upper Roller...................................541 Removal and Installation of Lower Roller...................................547 Disassembly of Lower Roller................................................553 Assembly of Lower Roller...................................................555 Group 7 Track..................................................................559 Removal and Installation of Track..........................................559 SECTION 5 FRONT ATTACHMENT.........................................................569 Group 1 Front Attachment.......................................................571 Removal and Installation of Front Attachment...............................571 Group 2 Cylinder...............................................................581 Removal and Installation of Boom Cylinder..................................581 Removal and Installation of Arm Cylinder...................................589 Removal and Installation of Bucket Cylinder................................597 Removal and Installation of Positioning Cylinder...........................601 Disassembly of Boom, Arm, and Bucket Cylinders.............................607 Disassembly of Positioning Cylinder........................................619 Assembly of Positioning Cylinder...........................................622 Group 3 Hose Rupture Valve.....................................................625 Removal and Installation of Hose Rupture Valve for Boom Cylinder...........625 Removal and Installation of Hose Rupture Valve for Arm Cylinder............629 Removal and Installation of Hose Rupture Valve for Positioning Cylinder....633 Structure of Hose Rupture Valve for Boom Cylinder (Right)..................637 Structure of Hose Rupture Valve for Boom Cylinder (Left)...................639 Structure of Hose Rupture Valve for Arm Cylinder...........................641 Structure of Hose Rupture Valve for Positioning Cylinder...................643 SERVICE MANUAL REVISION REQUEST FORM...............................................647
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