Hitachi ZX 300LC-7 300LCN-7 Hydraulic Excavator Operational Technical Manual PN:TODD650-EN-00 PDF

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Hitachi ZX 300LC-7 300LCN-7 Hydraulic Excavator Operational Technical Manual PN:TODD650-EN-00 – PDF DOWNLOAD

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Hitachi ZX 300LC-7 300LCN-7 Hydraulic Excavator Operational Technical Manual PN:TODD650-EN-00 – PDF DOWNLOAD

Language :English
Pages :481
Downloadable : Yes
File Type : PDF

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Hitachi ZX 300LC-7 300LCN-7 Hydraulic Excavator Operational Technical Manual PN:TODD650-EN-00 – PDF DOWNLOAD

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. (Note: Do not tear off the form. Copy this form for usage.)
•Service Material Development Center Hitach Construction Machinery Co., Ltd.
•TEL: 81-29-832-9673
•FAX: 81-29-831-1162
•E-mail: [email protected]
All information, illustrations and specifications in this manual are based on the latest product information available at the time of publication. The right is reserved to make changes at any time without notice.
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 ZX 300LC-7 300LCN-7 Hydraulic Excavator Operational Technical Manual PN:TODD650-EN-00 – PDF DOWNLOAD

TODD650-EN-00 1
INTRODUCTION 3
To The Reader 3
Additional References 3
Manual Composition 3
Page Number 3
Trademark 4
Safety Alert Symbol and Headline Notations 4
Units Used 4
SYMBOL AND ABBREVIATION 7
Symbol and Abbreviation 7
CONTRASTING LIST OF PART NAME 9
Contrasting List of Part Name between Technical Manual and Parts Catalog 9
SECTION AND GROUP CONTENTS 11
CONTENTS 13
GENERAL 21
Specifications 23
Specifications of ZX300LC-7, 300LCN-7 23
Specifications of ZX300LC-7, 300LCN-7 (2-Piece Boom) 24
Working Ranges of ZX300LC-7, 300LCN-7 25
Working Ranges of ZX300LC-7, 300LCN-7 (2-Piece Boom) 26
Component Layout 27
Main Component (Upperstructure) 27
Main Component (Undercarriage) 29
Main Component (Front Attachment) 29
Electrical System (Overview) 30
Electrical System (Rear Tray) 31
Electrical System (Switches) 32
Electrical System (Utility Space) 33
Electrical System (Relays) 34
Engine Oil Monitoring Sensor 34
Hydraulic Oil Monitoring Sensor 35
Engine 36
Aftertreatment Device 37
Pump Device 38
Around Pump Device 38
Control Valve 39
Signal Control Valve 39
Swing Device 40
Travel Device 41
5-Spool Solenoid Valve Unit 41
3-Spool Solenoid Valve Unit 42
2-Spool Solenoid Valve Unit (For Aftertreatment Device Regeneration Control) 42
DEF Tank 43
DEF Supply Module 43
Layout of Attachment Spec Parts 44
Around Control Valve 44
Control Valve Lower Side 45
Utility Space 46
Component Specifications 47
Specifications of Engine 47
Specifications of Engine Accessories 49
Specifications of Hydraulic Component 49
Specifications of Electrical Component 51
SYSTEM 53
Controller 55
Outline of Controller 55
CAN Circuit 55
Control System 57
Outline of Control System 57
Engine Control 57
Engine Control System Layout 58
Engine Protection Control 59
Engine Control Dial Control 61
ECO Control 63
Power Mode (ECO/PWR Mode) Switch Control 65
ECO Mode Control 67
Travel HP Mode Control 69
Auto-Idle Control 71
Hydraulic Oil Temperature Auto Warming-Up Control 73
Radiator Coolant Temperature Auto Warming-Up Control 75
Idle Speed-Up Control 77
Idle Speed-Up Control (Pilot Shut-Off Lever) 79
Engine Speed Slow Down Control 81
Heater Control 83
One-Touch Idle Control 85
Attachment Operation Speed Increase Control (Option) 87
Attachment Operation Speed Limit Control (Option) 89
Pump Control 91
Pump Control System Layout 92
Speed Sensing Control 93
Swing Relief Cut Control 95
Pump Torque Decrease Control (Radiator Coolant Temperature) 96
Pump Torque Decrease Control (Hydraulic Oil Temperature) 98
Travel Torque-Up Control100
Pump Torque Restriction Control (During Engine Output Restriction)102
Pump 1 Flow Rate Control104
Pump 2 Flow Rate Control106
Pump 3 Flow Rate Control108
Pump 1 Flow Rate Limit Control (Option)110
Pump 2 Flow Rate Limit Control (Option)112
Pump 3 Flow Rate Limit Control (Option)114
Valve Control (Standard)116
Valve Control (Standard) System Layout117
Power Digging Control118
Auto-Power Lift Control120
Travel Motor Displacement Angle Control122
Arm Regenerative Cut Control124
Digging Regenerative Control126
Arm 1 Flow Rate Control128
Arm 2 Roll-In Pilot Cut Control130
Aftertreatment Device Manual Regeneration Control132
Aftertreatment Device Auto Regeneration Control134
Pump 3 Center Bypass Shut-Out Control136
Arm Roll-In Meter-Out Open Control138
Valve Control (Option)141
Valve Control (Option) System Layout142
Attachment Flow Rate Control143
Auxiliary Flow Combiner Control145
Breaker 1 (HSB Breaker) Control147
Auxiliary Overload Relief Valve Pressure Control149
Pump/Valve Coordination Control151
Pump/Valve Coordination Control System Layout152
Pump 3 Minimum Displacement Angle Hold Control during Digging Operation153
Other Control156
Work Mode Control156
Auto Shut-Down Control156
Automatic Engine Stop Control at Low Temperature158
Hydraulic Oil Overheat Alarm Control159
Breaker Alarm Control (Option)160
Travel Alarm Control (Option)161
Swing Alarm Control (Option)162
Overload Alarm Control (Option)164
Engine System165
Outline of ECM System165
Fuel Injection Control166
Fuel Injection Amount Control167
Fuel Injection Timing Control169
Fuel Injection Rate Control171
Fuel Injection Pressure Control172
Fuel Injection Amount Correction Control174
EGR Control176
Preheating Control178
Variable Turbocharger Control179
Alarm Control180
Urea SCR System180
DEF Injection Control181
Start-Up Control182
DEF Defrosting Control(DEF Tank)183
DEF Defrosting Control(DEF Piping)184
DEF Thermal Control(DEF Tank)185
DEF Thermal Control(DEF Piping)186
After-Run Control187
Engine Output Restriction Control (INDUCEMENT)189
Insufficient DEF Level190
Malfunction of Urea SCR System/Malfunction of EGR System190
Outline of Aftertreatment Device191
Operation of Aftertreatment Device192
Aftertreatment Device Regeneration Control194
Hydraulic System197
Outline of Hydraulic System197
Pilot Circuit of Hydraulic System197
Operation Control Circuit199
Pump Control Circuit (Refer to COMPONENT OPERATION/Pump Device)201
Aftertreatment Device Regeneration Control Circuit (Refer to SYSTEM/Control System)203
Valve Control Circuit (Refer to COMPONENT OPERATION/Control Valve, Travel Device)204
Travel Motor Displacement Angle Control Circuit (Refer to COMPONENT OPERATION/Travel Device)207
Swing Parking Brake Release Circuit (Refer to COMPONENT OPERATION/Swing Device)209
Main Circuit of Hydraulic System209
Neutral Circuit212
Flow Combiner Circuit (Front Attachment)213
Relief Circuit215
Combined Operation Circuit217
Flow Combiner Circuit218
Digging Regenerative Circuit221
Arm Regenerative Cut Circuit223
Arm 1 Flow Rate Control Circuit225
Arm 2 Roll-In Pilot Cut Control Circuit227
Pump 3 Center Bypass Shut-Out Control Circuit229
Arm Roll-In Meter-Out Open Control Circuit231
Bucket Regenerative Cut Circuit233
Boom Lower Meter-In Cut Control235
Boom Cylinder Bottom Pressure: High (With the Front Attachment above the Ground)235
Boom Cylinder Bottom Pressure: Low (With the Track Raised off the Ground)236
Pump 3 Minimum Displacement Angle Hold Control during Digging Operation Circuit238
Breaker/Pulverizer/Crusher Circuit of Hydraulic System (Option)239
Auxiliary Flow Combiner Circuit241
When Performing Single Operation of Auxiliary Flow Combiner Circuit241
When Performing Combined Operation of Auxiliary Flow Combiner Circuit243
Breaker 1 (HSB Breaker) Circuit245
Breaker 2 (NPK Breaker) Circuit246
Electrical System249
Outline of Electrical System249
Main Circuit of Electrical System249
Electric Power Circuit (Key Switch: OFF)249
CAN Circuit251
Accessory Circuit (Key Switch: ACC)252
Starting Circuit (Key Switch: START)253
Charging Circuit (Key Switch: ON)255
Alternator Operation256
Regulator Operation257
Surge Voltage Prevention Circuit257
Pilot Shut-Off Circuit (Key Switch: ON)258
Auto Shut-Down Circuit/Automatic Engine Stop Circuit at Low Temperature259
Engine Stop Circuit261
Emergency Stop Circuit262
Monitor Circuit of Electrical System264
Security Circuit265
Aerial Angle Circuit266
Control Lever Automatic Pilot Shut-Off Circuit266
Seat Belt Reminder Circuit267
Radio Circuit268
Air Conditioner Circuit269
Accessory Circuit270
Work Light Circuit (Work Light: ON)270
Work Light Circuit (Work Light and Boom Light: ON)272
Wiper Circuit274
Washer Circuit276
Cab Light Circuit (Cab Light Switch: Door Interlocking Position (Key Switch: ON))278
Cab Light Circuit (Cab Light Switch: ON Position)279
COMPONENT OPERATION281
Pump Device285
Outline of Pump Device285
Outline of Main Pump286
Operational Principle of Main Pump286
Increasing and Decreasing of Main Pump Delivery Flow Rate287
Outline of Regulator288
Regulator Control Function290
Control by Pump Control Pressure291
Control by Own and Partner Pump Delivery Pressure (Regulators for Pump 1 and Pump 2)291
Control by Own Pump Delivery Pressure (Pump 3 Regulator)292
Control by Pilot Pressure from Torque Control Solenoid Valves293
Control by Pilot Pressure from Maximum Pump Flow Rate Limit Control Solenoid Valves (Pump Flow Rate Limit Control)295
Control by Pilot Pressure from Maximum Pump Flow Rate Limit Control Solenoid Valves (Pump Flow Rate Control)296
Flow Rate Increase Control by Pump Control Pressure297
Flow Rate Decrease Control by Pump Control Pressure300
Flow Rate Decrease Control by Own and Partner Pump Delivery Pressure (Regulators for Pump 1 and Pump 2)303
Flow Rate Increase Control by Own and Partner Pump Delivery Pressure (Regulators for Pump 1 and Pump 2)306
Flow Rate Decrease Control by Own Pump Delivery Pressure (Pump 3 Regulator)309
Flow Rate Increase Control by Own Pump Delivery Pressure (Pump 3 Regulator)312
Flow Rate Decrease Control by Pilot Pressure from Torque Control Solenoid Valve314
Flow Rate Control by Pilot Pressure from Maximum Pump Flow Rate Limit Control Solenoid Valves (Pumps 1, Pump 2, and Pump 3)317
Outline of Maximum Flow Rate Limit Control Solenoid Valve and Torque Control Solenoid Valve318
Operation of Maximum Flow Rate Limit Control Solenoid Valve and Torque Control Solenoid Valve318
Outline of Pilot Pump320
Outline of Pump Delivery Pressure Sensor320
Outline of Pump Control Pressure Sensor320
Swing Device323
Outline of Swing Device323
Outline of Swing Reduction Gear324
Outline of Swing Motor325
Outline of Swing Parking Brake326
When Brake is Released of Swing Parking Brake326
When Brake is Applied of Swing Parking Brake326
Outline of Valve Unit328
Operation of Make-Up Valve328
Outline of Swing Relief Valve330
Low-Pressure Relief Operation (Shockless Function) of Swing Relief Valve330
High-Pressure Relief Operation (Overload Prevention) of Swing Relief Valve330
Outline of Swing Dampener Valve331
Operation of Swing Dampener Valve332
Output Curve of Swing Dampener Valve: Between A and B (When Relieving)332
Output Curve of Swing Dampener Valve: Operation of Combination Valve A between A and B (During Relief)333
Output Curve of Swing Dampener Valve: Operation of Combination Valve B between A and B (During Relief)335
Output Curve of Swing Dampener Valve: Between B and C (Pressure Begins to Decrease)337
Output Curve of Swing Dampener Valve: Operation of Combination Valve A between B and C (Pressure Begins to Decrease)339
Output Curve of Swing Dampener Valve: Between C and D (Port BM Pressure Decreases)341
Output Curve of Swing Dampener Valve: Operation of Combination Valve B between C and D (Port BM Pressure Decreases)343
Output Curve of Swing Dampener Valve: Between D and E (During Aftershock)345
Output Curve of Swing Dampener Valve: Operation of Combination Valve A between D and E (During Aftershock)347
Output Curve of Swing Dampener Valve: Operation of Combination Valve B between D and E (During Aftershock)349
Control Valve353
Outline of Control Valve353
Components in Control Valve354
Main Circuit of Control Valve373
Pilot Operation Control Circuit of Control Valve376
External Pilot Pressure Circuit of Control Valve377
Operation of Flow Combiner Valve379
Outline of Main Relief Valve381
Relief Operation of Main Relief Valve381
Pressure Increasing Operation of Main Relief Valve382
Outline of Overload Relief Valve (With Make-Up Function)383
Relief Operation of Overload Relief Valve383
Make-Up Operation of Overload Relief Valve384
Outline of Regenerative Valve385
Operation of Boom Regenerative Valve385
Outline of Bucket Regenerative Valve386
Operation When Performing Bucket Regenerative Operation387
Operation When Performing Bucket Regenerative Cut Operation388
Operation When Performing Arm Regenerative Operation390
Operation When Releasing Arm Regenerative Operation393
Outline of Anti-Drift Valve395
Holding Operation of Anti-Drift Valve395
Releasing Operation of Anti-Drift Valve396
Outline of Flow Rate Control Valve397
Normal Operation of Flow Rate Control Valve397
Flow Rate Control Operation of Flow Rate Control Valve398
Outline of Arm Roll-In Meter-Out Open Control Spool399
Operation of Arm Roll-In Meter-Out Open Control Spool399
Outline of Digging Regenerative Valve402
Operation of Digging Regenerative Valve402
Outline of Boom Lower Meter-In Cut Valve403
Operation of Boom Lower Meter-In Cut Valve (With the Track off the Ground)404
Operation of Boom Lower Meter-In Cut Valve (With the Front Attachment above the Ground)406
Outline of Auxiliary Flow Combiner Valve and Pump 1 Bypass Shut-Out Valve409
Operation of Auxiliary Flow Combiner Valve and Pump 1 Bypass Shut-Out Valve (During Single Operation)409
Operation of Auxiliary Flow Combiner Valve and Pump 1 Bypass Shut-Out Valve (During Combined Operation)411
Outline of Pump 3 Bypass Shut-Out Valve414
Operation of Pump 3 Bypass Shut-Out Valve414
Pilot Valve417
Outline of Pilot Valve417
Outline of Front Attachment/Swing Pilot Valve417
Outline of Travel Pilot Valve418
Outline of Auxiliary 1 and Positioning/Auxiliary 2 Pilot Valves418
Operation of Front Attachment/Swing and Travel Pilot Valves419
When Front Attachment/Swing and Travel Pilot Valves are in Neutral (Output Curve: A to B)420
During Metering or Decompressing of Front Attachment/Swing and Travel Pilot Valves (Output Curve: C to D)422
Full Stroke of Front Attachment/Swing and Travel Pilot Valves (Output Curve: E to F)424
Operation of Auxiliary 1 and Positioning/Auxiliary 2 Pilot Valves426
When Auxiliary 1 and Positioning/Auxiliary 2 Pilot Valves are in Neutral (Output Curve: A to B)426
During Metering or Decompressing of Auxiliary 1 and Positioning/Auxiliary 2 Pilot Valves (Output Curve: C to D)427
Outline of Shockless Function (Only Travel Pilot Valve)429
Operation of Shockless Function429
Travel Device431
Outline of Travel Device431
Outline of Travel Reduction Gear431
Outline of Travel Motor432
Operation of Travel Motor433
Outline of Parking Brake434
Operation of Parking Brake (When Parking Brake is Released)435
Operation of Parking Brake (When Parking Brake is Applied)437
Outline of Travel Brake Valve438
Operation of Counterbalance Valve (During Travel)439
Operation of Counterbalance Valve (When Descending a Slope)440
Outline of Travel Relief Valve442
Operation of Travel Relief Valve (During Relief)442
Operation of Travel Relief Valve (During Make-Up)443
Outline of Travel Mode Control445
Operation of Selecting Travel Mode (Slow Speed)445
Operation of Selecting Travel Mode (Fast Speed)446
Signal Control Valve449
Outline of Signal Control Valve449
Pilot Valve Side of Pilot Port449
Control Valve Side of Pilot Port450
Outline of Shuttle Valve452
Outline of Shockless Valve455
Operation of Shockless Valve (During Boom Raise Operation)455
Operation of Shockless Valve (During Boom Lower Operation or When Stopping Boom Raise Operation (Shock Reducing Operation))456
Operation of Pump 1 Flow Rate Control Valve, Pump 2 Flow Rate Control Valve, and Pump 3 Flow Rate Control Valve459
Operation of Flow Combiner Valve Control Spool460
Operation of Swing Parking Brake Release Spool460
Others (Upperstructure)461
Outline of Pilot Shut-Off Solenoid Valve461
Pilot Shut-Off Lever: LOCK Position462
Pilot Shut-Off Lever: UNLOCK Position462
Outline of Solenoid Valve463
Outline of 5-Spool Solenoid Valve Unit463
Outline of 3-Spool Solenoid Valve Unit464
Outline of 2-Spool Solenoid Valve Unit (For Aftertreatment Device Manual Regeneration Control)464
Outline of Auxiliary Control Solenoid Valve Unit (Option)465
Outline of Proportional Solenoid Valve466
Operation of Proportional Solenoid Valve (When in Neutral)466
Operation of Proportional Solenoid Valve (When Excited)466
Outline of ON/OFF Solenoid Valve468
Operation of ON/OFF Solenoid Valve (when in Neutral)468
Operation of ON/OFF Solenoid Valve (When in Operation)468
Outline of Hose Rupture Valve469
Operation of Hose Rupture Valve (When Control Lever is in Neutral)469
Operation of Hose Rupture Valve (During Boom Lower Operation (Control Lever Stroke: Less than Half-Stroke))470
Operation of Hose Rupture Valve (During Boom Lower Operation (Control Lever Stroke: More than Half-Stroke))472
Outline of Pilot Relief Valve475
Outline of Recirculation Valve476
Others (Undercarriage)477
Outline of Swing Bearing477
Outline of Center Joint478
Outline of Track Adjuster (Front Idler Integrated Type)479
SERVICE MANUAL REVISION REQUEST FORM481

S.M 30/1/25