Komatsu Hydraulic Excavator PC78US-11E0 Shop Manual SEN06854-08 PDF

Description

Komatsu Hydraulic Excavator PC78US-11E0 Shop Manual SEN06854-08 –  PDF DOWNLOAD

FILE DETAILS:

Komatsu Hydraulic Excavator PC78US-11E0 Shop Manual SEN06854-08 –  PDF DOWNLOAD

Language : English
Pages : 2546
Downloadable : Yes
File Type : PDF

IMAGES PREVIEW OF THE MANUAL:

TABLE OF CONTENTS:

Komatsu Hydraulic Excavator PC78US-11E0 Shop Manual SEN06854-08 –  PDF DOWNLOAD

• SERIAL NUMBERS 50001 and up

Cover 1
00 Index and Foreword . 3
Index . 4
Foreword, Safety, Basic Information . 18
How to Read the Shop Manual . 18
Safety Notice for Operation . 20
Precautions to Prevent Fire . 28
Procedures If Fire Occurs . 30
Precautions When You Discard Waste Materials 31
Precautions When You Handle Hydraulic Equipment . 32
Precautions When You Disconnect and Connect Pipings . 35
Precautions When You Handle Electrical Equipment 42
Precautions When You Handle Fuel System Equipment . 44
Precautions When You Handle Intake System Equipment . 45
Practical Use of KOMTRAX 46
Disconnect and Connect Push-Pull Type Coupler . 47
How to Disconnect and Connect Type 1 Push-Pull Type Coupler . 47
How to Disconnect and Connect Type 2 Push-Pull Type Coupler . 48
How to Disconnect and Connect Type 3 Push-Pull Type Coupler . 49
Precautions for Disconnection and Connection of Connectors 51
How to Disconnect and Connect Deutsch Connector . 55
How to Disconnect and Connect Slide Lock Type Connector . 56
How to Disconnect and Connect Connector with Lock to Pull . 58
How to Disconnect and Connect Connector with Lock to Push . 59
How to Disconnect and Connect Connector with Housing to Rotate 61
How to Read the Codes for Electric Cable 62
Explanation of Terms for Maintenance Standard . 66
Standard Tightening Torque Table 69
Conversion Table 76
Abbreviation List . 81
01 Specifications . 87
Table of Contents . 88
Specifications 89
Specification Drawing . 89
Specification Drawing: PC78US-11E0 90
Working Range Drawings 92
Working Range Drawings: PC78US-11E0 . 93
Specifications 94
Specification: PC78US-11E0 95
Weight Table 99
Weight Table: PC78US-11E0 . 100
Fuel, Coolant, Lubricants (For European Union) 102
How to Use Fuel, Coolant and Lubricants by Ambient Temperature 102
10 Structure and Function . 105
Table of Contents . 106
Boot-up System 109
Layout Drawing of Boot-up System 109
System Operating Lamp System 110
System Diagram of System Operating Lamp System (Machine with Gateway Function Controller) . 110
Function of System Operating Lamp System (Machine with Gateway Function Controller) . 110
Battery Disconnect Switch . 112
Function of Battery Disconnect Switch . 112
Engine System . 113
Layout Drawing of Engine System . 113
Engine Control System . 115
System Diagram of Engine Control 115
Function of Engine Control System . 116
Auto-Deceleration System 118
System Diagram of Auto-Deceleration System 118
Function of Auto-Deceleration System 118
Operation of Auto-Deceleration System . 119
Engine Automatic Warm-up System . 120
System Diagram of Engine Automatic Warm-up System . 120
Function of Engine Automatic Warm-up System . 121
Overheat Prevention System 122
Function of Overheat Prevention System 122
Turbocharger Protection System 123
Function of Turbocharger Protection System 123
Automatic Idle Stop System 124
System Diagram of Automatic Idle Stop System (Machine with Gateway Function Controller) . 124
Function of Automatic Idle Stop System 124
Component Parts of Engine System 127
PTO . 127
Turbocharger 128
EGR System 130
EGR Valve . 133
EGR Cooler 135
High Efficiency Breather System . 136
High Efficiency Breather 137
Exhaust Throttle Valve 139
KDPF 140
Cooling System 144
Layout Drawing of Cooling System 144
Specifications of Cooling System 145
Control System 146
Layout Drawing of Control System 146
Machine Monitor System 148
System Diagram of Machine Monitor System (Machine with Gateway Function Controller) . 148
Function of Machine Monitor System 148
KOMTRAX System 150
System Diagram of KOMTRAX System 150
Function of KOMTRAX System 150
Component Parts of Control System . 151
Machine Monitor . 151
Gateway Function Controller . 165
Communication Terminal 168
Pump Controller . 170
Resistor for PC-EPC Valve . 175
CAN Terminating Resistor 176
Engine Controller . 177
Fuel Control Dial . 184
Hydraulic System 185
Layout Drawing of Hydraulic System 185
CLSS 188
Structure of CLSS . 188
Function of CLSS 189
Engine and Pump Combined Control System . 191
Engine and Pump Combined Control System Diagram . 191
Function of Engine and Pump Combined Control System . 192
Component Parts of Hydraulic System . 195
Hydraulic Tank 196
Main Pump . 198
Control Valve . 216
Work Equipment System . 277
Layout Drawing of Work Equipment System . 277
PPC Lock System . 279
System Diagram of PPC Lock 279
Function of PPC Lock System . 279
Work Equipment and Travel Automatic Lock System . 280
System Diagram of Lock Lever Automatic Lock System 280
Function of Work Equipment and Travel Automatic Lock System . 280
Operation of Lock Lever Automatic Lock System . 281
Overload Caution System . 282
Overload Caution System Diagram . 282
Function of Overload Caution System . 283
Attachment Oil Flow Adjuster System . 284
Attachment Oil Flow Adjuster System Diagram . 284
Function of Attachment Oil Flow Adjuster System . 284
Component Parts of Work Equipment System 285
Work Equipment and Swing PPC Valve 285
1st-Line Attachment PPC Valve (with EPC Valve) 289
Attachment Oil Flow Adjuster EPC Valve 295
Blade PPC Valve . 295
Solenoid Valve 297
Boom Anti-drop Valve 300
Arm Anti-Drop Valve . 305
Multi-Control Valve . 309
Pilot Circuit Accumulator . 311
Attachment Circuit Accumulator (For Low Pressure Circuit) . 312
Swing System 313
Layout Drawing of Swing System 313
Swing Control System Diagram 315
Function of Swing Control System 315
Component Parts of Swing System . 317
Swing Motor . 317
Swing Machinery . 326
Swing Circle 328
Travel System . 330
Layout Drawing of Travel System . 330
System Diagram of Travel Control System . 332
Function of Travel Control System . 332
Component Parts of Travel System 334
Travel Motor 334
Travel PPC Valve 342
Center Swivel Joint . 347
Undercarriage and Frame . 348
Layout Drawing of Undercarriage . 348
Specifications of Undercarriage . 348
Idler Cushion . 350
Structure of Idler Cushion 350
Specifications of Idler Cushion . 350
Work Equipment 351
Structure of Work Equipment . 351
Function of Work Equipment 352
Work Equipment Clearance Adjustment Shim 353
Function of Work Equipment Clearance Adjustment Shim 353
Bucket Clearance Adjustment Shim 354
Function of Bucket Clearance Adjustment Shim 354
CAB Related Parts . 355
ROPS CAB 355
Structure of ROPS CAB . 355
Function of ROPS CAB 355
CAB Mount . 356
Structure of CAB Mount 356
Function of CAB Mount . 357
Remove Wiring Harness Out of Cab 358
20 Standard Value Table . 359
Table of Contents . 360
Standard Value Table for Engine . 361
Standard Value Table for Engine: PC78US-11E0 361
Standard Value Table for Machine 363
Standard Value Table for Machine: PC78US-11E0 . 363
Machine Posture and Procedures to Measure Performance . 377
30 Testing and Adjusting 381
Table of Contents . 382
Precautions Before Work . 385
Related Information on Testing and Adjusting 386
Differences In Machine Monitor Symbols 386
Tools for Testing and Adjusting . 387
Sketch of Tools for Testing and Adjusting . 392
Engine and Cooling System . 394
Examine Engine Speed 394
How to Examine Engine Speed . 394
Examine Exhaust Gas Color . 398
How to Examine Exhaust Gas Color with the Handy Smoke Checker . 398
How to Examine Exhaust Gas Color with Smoke Meter . 399
Examine and Adjust Valve Clearance 401
How to Examine Valve Clearance 401
How to Adjust Valve Clearance . 402
Examine Compression Pressure 403
How to Examine Compression Pressure . 403
Examine Blowby Pressure . 406
How to Examine Blowby Pressure 406
Examine Engine Oil Pressure . 408
How to Examine Engine Oil Pressure 408
Visual Check Inside of EGR Valve 410
How to do the Visual Check Inside of EGR Valve 410
Clean Inside of EGR Valve . 412
How to Clean Inside of EGR Valve 412
Examine Fuel Pressure . 415
How to Examine Fuel Pressure 415
Examine Fuel Return Rate and Leakage 417
How to Examine Fuel Return Rate and Leakage . 419
Bleed Air from Fuel System 422
How to Bleed Air from Fuel System . 422
Examine Fuel Circuit for Leakage 424
How to Examine Fuel System for Leakage 424
Handle Cylinder Cut-out Mode Operation 426
Handle No-Injection Cranking Operation 427
Examine Fan Belt 428
How to Examine Fan Belt . 428
Examine Automatic Tensioner . 429
How to Examine Automatic Tensioner 429
Write Injector Compensation Value to Engine Controller 431
How to Write Injector Compensation Value 431
Power Train . 437
Examine Swing Circle Bearing Clearance 437
How to Examine Swing Circle Bearing Clearance . 437
Undercarriage and Frame . 439
Examine and Adjust Track Tension 439
How to Examine Track Tension 439
How to Adjust Track Tension . 439
Hydraulic System 441
Release Remained Pressure in Hydraulic Circuit 441
How to Release Remained Pressure from Hydraulic Tank 441
How to Release Remained Pressure in Hydraulic Cylinder Circuit 441
How to Release Remained Pressure from Swing Motor Circuit . 444
How to Release Remained Pressure from Travel Motor Circuit 444
Examine and Adjust Oil Pressure in Work Equipment and Travel Circuits . 446
How to Examine Oil Pressure in Work Equipment and Travel Circuits . 446
How to Adjust Oil Pressure in Work Equipment and Travel Circuits 454
How to Adjust Work Equipment and Travel Relief Pressure . 455
Examine and Adjust Swing and Blade Circuit Oil Pressure . 456
How to Examine Swing and Blade Relief Pressure 456
How to Adjust Swing Relief Pressure . 458
How to Adjust Blade LOWER Relief Pressure . 458
How to Adjust Blade RAISE Relief Pressure . 459
Examine Oil Pressure of Control Circuit . 460
How to Examine Oil Pressure in Control Circuit 460
Examine and adjust oil pressure in pump PC control circuit 462
How to Examine PC Valve Outlet Pressure (Servo Piston Inlet Pressure) . 462
How to Examine Source Pressure of PC-EPC Valve 464
How to Examine PC-EPC Valve Output Pressure . 465
How to Adjust Oil Pressure in Pump PC Control Circuit . 466
Examine and Adjust Oil Pressure in Pump LS Control Circuit 468
How to Examine LS Differential Pressure with Machine Monitor 468
How to Examine LS Differential Pressure by Testing Tool . 470
How to Adjust LS Valve 472
Examine Outlet Pressure of Solenoid Valve . 474
How to Examine Outlet Pressure of Solenoid Valve 474
Operating Condition of Solenoid Valve . 476
Examine PPC Valve Outlet Pressure . 477
How to Examine PPC Valve Outlet Pressure 477
Examine and Adjust Travel Deviation . 479
How to Examine Travel Deviation . 479
How to Adjust Travel Deviation 480
Examine Parts Which Cause Hydraulic Drift of Work Equipment . 482
How to Examine Parts Which Cause Hydraulic Drift of Boom Cylinder and Bucket Cylinder . 482
How to Examine the Parts Which Cause Hydraulic Drift of Arm Cylinder 482
How to Examine Parts that Cause Hydraulic Drift of PPC Valve 483
Examine Oil Leakage . 484
How to Examine Oil Leakage from Boom Cylinder . 484
How to Examine Oil Leakage from Arm Cylinder 485
How to Examine Oil Leakage from Bucket Cylinder . 485
How to Examine Oil Leakage from Blade Cylinder 486
How to Examine Oil Leakage from Swing Motor . 487
How to Examine Oil Leakage from Travel Motor 488
Bleed Air from Hydraulic System . 490
How to Bleed Air from Hydraulic System 491
CAB Related Parts . 497
How to Adjust Mirrors . 497
Adjust Left Front Mirror (A) 498
How to Adjust Left Front Mirror (B) . 499
How to Examine and Adjust Slide Door 500
How to Examine and Adjust Slide Door When It is Closed and Locked . 500
How to Examine and Adjust Slide Door When It is Open and Locked . 512
Electrical System . 525
Set and Operate Machine Monitor . 525
Operator Mode . 529
Function to Show Technician Identification Status Screen 529
Function to Show Operator Identification Input Screen . 529
Examine Function by LCD (Liquid Crystal Display) 530
Examine Function of Service Meter . 530
Usage Limitation and Maintenance Password Change Function . 531
Service Mode 534
How to Operate Service Mode . 534
How to See Pre-defined Monitoring Information . 536
How to Examine Monitoring Information . 540
Abnormality Record Menu . 550
How to See Maintenance Record . 555
Maintenance Mode Setting 556
How to Set Phone Number Entry . 560
Default Setting Menu 562
Testing Menu 572
Adjustment Menu . 581
No-Injection Cranking Operation . 600
KOMTRAX Settings Menu . 603
How to Show Service Message . 605
How to Start Up KOMTRAX System 607
Adjust Rearview Camera Angle 614
How to Adjust Rearview Camera Angle . 614
Adjust Rightview Camera Angle . 617
How to Adjust Right View Camera Angle . 617
Set Region of Bluetooth(R) Compatible Radio . 620
How to Set Region of Bluetooth(R) Compatible Radio 620
Handle Voltage Circuit of Engine Controller . 622
Handle Battery Disconnect Switch 623
Examine Diodes 624
How to Examine Diodes by Digital Tester . 624
How to Examine Diodes by Analog Tester 624
Pm Clinic . 625
Pm Clinic Service . 625
Pm Clinic Check Sheet: PC78US-11E0 627
40 Troubleshooting 639
Table of Contents . 640
Precautions Before Work . 648
Related Information to Troubleshooting 649
General Troubleshooting Points 649
Troubleshooting Points for Aftertreatment System 650
Sequence of Events in Troubleshooting . 658
Checks Before Troubleshooting . 660
Inspection Procedure Before Troubleshooting . 662
Walk-Around Check . 662
Test in Accordance with Testing Procedure . 664
Examine Fuel Level and Type . 664
Examine Fuel Prefilter 665
Examine Water Separator, Drain Water and Sediment . 665
How to Replace Fuel Prefilter Cartridge . 666
Examine Fuel Main Filter 668
Examine Engine Oil Level (Oil Quantity in Oil Pan) 669
Examine Oil Level in PTO Gear Case 670
Examine Coolant Level (Expansion Tank) 672
Examine Air Cleaner Clogging 673
Clean Outer Element . 673
Replace Element . 675
Examine Hydraulic Oil Level . 676
Examine Hydraulic Oil Strainer 678
Examine Hydraulic Oil Filter 680
Examine Oil Level in Swing Machinery Case . 681
Examine Oil Level in Final Drive Case . 682
Bleed Air from Fuel System 683
Bleed Air from Hydraulic System . 683
How to Examine Electric Equipment . 683
Preparation for Troubleshooting of Electrical System 688
Preparation for Troubleshooting of Machine Monitor 688
Preparation for Troubleshooting of Engine Controller 690
Preparation for Troubleshooting of Pump Controller 691
Preparation for Troubleshooting of Gateway Function Controller 691
How to Disconnect and Connect Connector with a Special Lock . 692
Procedure for Troubleshooting . 696
Symptom and Troubleshooting Numbers . 699
Information Shown in Troubleshooting Table 704
How to Diagnose Open Circuit of Hydraulic Pressure Sensor System Wiring Harness . 706
Connector and Wiring Harness Identification Table . 709
Connector Layout 715
Connector Contact Connection Table 721
T-Branch Box and T-Branch Adapter Table . 768
Fuse Location Table . 774
Precautions When You Clean and Replace KDPF (KCSF and KDOC) . 776
Prepare Short Circuit Electrical Connector (For Failure Codes [CA1883] and [CA3135]) 780
Failure Code Table 782
Troubleshooting by Failure Code (Display of Code) . 794
Failure Code [6AZ0ZG] . 794
Failure Code [879AKA] . 796
Failure Code [879AKB] . 797
Failure Code [879BKA] . 798
Failure Code [879BKB] . 800
Failure Code [879CKA] . 802
Failure Code [879CKB] . 803
Failure Code [879DKZ] . 804
Failure Code [879EMC] . 806
Failure Code [879FMC] . 807
Failure Code [879GKX] . 808
Failure Code [989L00] . 810
Failure Code [989M00] . 811
Failure Code [989N00] . 812
Failure Code [A1U0N3] . 813
Failure Code [A1U0N4] . 815
Failure Code [A900FR] . 817
Failure Code [A900N6] . 818
Failure Code [A900NY] . 819
Failure Code [AA10NX] . 820
Failure Code [AB00KE] . 822
Failure Code [AQ10MB] . 824
Failure Code [AQ10N3] . 826
Failure Code [AS00R2] . 828
Failure Code [AS00R3] . 829
Failure Code [AS00R4] . 830
Failure Code [AS00R6] . 831
Failure Code [B@BAZG] . 832
Failure Code [B@BCNS] . 833
Failure Code [B@BCQA] . 834
Failure Code [B@BCZK] . 836
Failure Code [B@HANS] . 838
Failure Code [CA115] 840
Failure Code [CA122] 841
Failure Code [CA123] 843
Failure Code [CA131] 845
Failure Code [CA132] 847
Failure Code [CA144] 849
Failure Code [CA145] 851
Failure Code [CA153] 853
Failure Code [CA154] 856
Failure Code [CA187] 859
Failure Code [CA221] 861
Failure Code [CA222] 863
Failure Code [CA227] 865
Failure Code [CA234] 866
Failure Code [CA238] 867
Failure Code [CA239] 869
Failure Code [CA271] 871
Failure Code [CA272] 873
Failure Code [CA322] 875
Failure Code [CA324] 878
Failure Code [CA331] 881
Failure Code [CA343] 884
Failure Code [CA351] 885
Failure Code [CA352] 886
Failure Code [CA356] 888
Failure Code [CA357] 890
Failure Code [CA386] 893
Failure Code [CA435] 894
Failure Code [CA441] 896
Failure Code [CA442] 898
Failure Code [CA449] 899
Failure Code [CA451] 900
Failure Code [CA452] 902
Failure Code [CA515] 904
Failure Code [CA516] 906
Failure Code [CA553] 908
Failure Code [CA559] 909
Failure Code [CA689] 913
Failure Code [CA691] 915
Failure Code [CA692] 917
Failure Code [CA697] 919
Failure Code [CA698] 920
Failure Code [CA731] 921
Failure Code [CA778] 922
Failure Code [CA1117] . 925
Failure Code [CA1664] . 926
Failure Code [CA1691] . 928
Failure Code [CA1695] . 931
Failure Code [CA1696] . 932
Failure Code [CA1879] . 934
Failure Code [CA1881] . 936
Failure Code [CA1883] . 938
Failure Code [CA1896] . 943
Failure Code [CA1921] . 947
Failure Code [CA1922] . 950
Failure Code [CA1961] . 955
Failure Code [CA1993] . 956
Failure Code [CA2185] . 960
Failure Code [CA2186] . 962
Failure Code [CA2249] . 964
Failure Code [CA2272] . 965
Failure Code [CA2311] . 968
Failure Code [CA2349] . 969
Failure Code [CA2353] . 971
Failure Code [CA2357] . 973
Failure Code [CA2637] . 974
Failure Code [CA2639] . 976
Failure Code [CA2765] . 978
Failure Code [CA2777] . 979
Failure Code [CA2973] . 982
Failure Code [CA3133] . 983
Failure Code [CA3134] . 985
Failure Code [CA3135] . 987
Failure Code [CA3251] . 990
Failure Code [CA3253] . 992
Failure Code [CA3254] . 995
Failure Code [CA3255] . 997
Failure Code [CA3256] .1000
Failure Code [CA3311] .1002
Failure Code [CA3312] .1004
Failure Code [CA3313] .1007
Failure Code [CA3314] .1008
Failure Code [CA3315] .1009
Failure Code [CA3316] .1011
Failure Code [CA3317] .1013
Failure Code [CA3318] .1014
Failure Code [CA3319] .1016
Failure Code [CA3321] .1017
Failure Code [CA3322] .1019
Failure Code [CA3419] .1021
Failure Code [CA3421] .1023
Failure Code [CA3724] .1025
Failure Code [CA4151] .1026
Failure Code [CA4158] .1030
Failure Code [CA4161] .1031
Failure Code [CA4162] .1033
Failure Code [CA4163] .1035
Failure Code [CA4259] .1037
Failure Code [CA4264] .1039
Failure Code [CA4952] .1041
Failure Code [CA5271] .1043
Failure Code [CA5272] .1046
Failure Code [CA5383] .1049
Failure Code [CA5631] .1051
Failure Code [CA5938] .1053
Failure Code [CA6654] .1055
Failure Code [CA6887] .1056
Failure Code [CA6891] .1059
Failure Code [CA7681] .1060
Failure Code [CA7797] .1061
Failure Code [CA7798] .1062
Failure Code [CA7822] .1063
Failure Code [CA7869] .1064
Failure Code [D110KB] .1068
Failure Code [D19JKZ] .1070
Failure Code [D811MC] .1072
Failure Code [D862KA] .1073
Failure Code [D8ALKA] .1074
Failure Code [D8ALKB] .1076
Failure Code [D8AQKR] .1078
Failure Code [D8G1KT] .1083
Failure Code [D8G6KT] .1084
Failure Code [DA20MC] .1085
Failure Code [DA22KK] .1086
Failure Code [DA22KT] .1089
Failure Code [DA25KP] .1091
Failure Code [DA26KP] .1094
Failure Code [DA29KQ] .1096
Failure Code [DA2JKT] .1098
Failure Code [DA2JKY] .1099
Failure Code [DA2LKA] .1100
Failure Code [DA2LKB] .1102
Failure Code [DA2QKR] .1104
Failure Code [DA2RKR] .1110
Failure Code [DAF0MB] .1115
Failure Code [DAF0MC] .1116
Failure Code [DAF8KB] .1117
Failure Code [DAF9KQ] .1119
Failure Code [DAFGMC] .1120
Failure Code [DAFLKA] .1121
Failure Code [DAFLKB] .1123
Failure Code [DAFQKR] .1125
Failure Code [DAZ9KQ] .1131
Failure Code [DAZQKR] .1132
Failure Code [DB2QKR] .1136
Failure Code [DB2RKR] .1142
Failure Code [DDNRKA] .1147
Failure Code [DDNRKY] .1151
Failure Code [DDNS00] .1154
Failure Code [DGH2KA] .1157
Failure Code [DGH2KB] .1159
Failure Code [DHA4KA] .1160
Failure Code [DHAAMA] .1162
Failure Code [DHACMA] .1163
Failure Code [DHPAMA] .1164
Failure Code [DHS3MA] .1166
Failure Code [DHS4MA] .1168
Failure Code [DHS5MA] .1170
Failure Code [DHS8MA] .1172
Failure Code [DHS9MA] .1174
Failure Code [DHSAMA] .1176
Failure Code [DHSBMA] .1178
Failure Code [DHSCMA] .1180
Failure Code [DHSDMA] .1182
Failure Code [DHX1MA] .1184
Failure Code [DKR0MA] .1186
Failure Code [DKULKA] .1188
Failure Code [DKULKB] .1191
Failure Code [DKULKY] .1194
Failure Code [DLM5KA] .1197
Failure Code [DLM5MB] .1200
Failure Code [DR21KX] .1203
Failure Code [DV20KB] .1205
Failure Code [DW43KA] .1207
Failure Code [DW43KB] .1209
Failure Code [DW43KY] .1211
Failure Code [DW45KA] .1213
Failure Code [DW45KB] .1217
Failure Code [DW45KY] .1221
Failure Code [DW4CKY] .1224
Failure Code [DWA2KA] .1227
Failure Code [DWA2KB] .1229
Failure Code [DWA2KY] .1231
Failure Code [DWJ0KA] .1233
Failure Code [DWJ0KB] .1235
Failure Code [DWJ0KY] .1237
Failure Code [DWN5KA] .1239
Failure Code [DWN5KB] .1242
Failure Code [DWN5KY] .1245
Failure Code [DXA8KA] .1248
Failure Code [DXA8KB] .1251
Failure Code [DXE4KA] .1254
Failure Code [DXE4KB] .1256
Failure Code [DXE4KY] .1258
Failure Code [DY20KA] .1260
Failure Code [DY20MA] .1262
Failure Code [DY2CKB] .1264
Failure Code [DY2DKB] .1266
Failure Code [DY2EKB] .1268
Failure code [F311KA] .1270
Failure code [F311KB] .1272
Failure code [F312KA] .1274
Failure code [F312KB] .1276
Failure Code [F313KA] .1278
Failure Code [F313KB] .1279
Failure code [F314KA] .1280
Failure code [F314KB] .1282
Failure Code [F315KB] .1284
Failure Code [F315KY] .1286
Failure code [F316KB] .1288
Failure code [F316KY] .1290
Failure Code [F318KB] .1292
Failure Code [F318KY] .1293
Failure code [F31AKB] .1294
Failure code [F31AKY] .1296
Failure Code [F31BKB] .1298
Failure Code [F31BKY] .1300
Failure Code [F31CKB] .1302
Failure Code [F31CKY] .1304
Failure Code [F31DKB] .1306
Failure Code [F31DKY] .1308
Failure Code [F31EKB] .1310
Failure Code [F31EKY] .1312
Failure Code [FS10ZE] .1314
Troubleshooting of Electrical System (E-Mode) .1315
Engine Does Not Start (Engine Does Not Crank) .1315
Manual Preheating System Does Not Operate .1321
While Preheating is in Operation, Preheating Monitor Does Not Come On .1324
When Starting Switch is Turned to ON Position, Machine Monitor Shows Nothing 1326
Engine Coolant Temperature Monitor Comes On in White While Engine is in Operation .1329
Hydraulic Oil Temperature Monitor Comes On in White While Engine is in Operation 1330
Charge Level Monitor Comes On in Red While Engine is in Operation .1331
Fuel Level Monitor Comes On in Red While Engine is in Operation .1332
Engine Coolant Temperature Monitor Comes On in Red While Engine is in Operation .1333
Engine Oil Pressure Monitor Comes On in Red While Engine is in Operation 1334
Hydraulic Oil Temperature Monitor Comes On in Red While Engine is in Operation 1335
Fuel Gauge Does Not Move from Minimum or Maximum 1336
Display of Fuel Gauge is Different from Actual Fuel Level .1338
Coolant Temperature Gauge Display Does Not Move from Minimum or Maximum .1339
Display of Coolant Temperature Gauge is Different from Actual Coolant Temperature .1340
Hydraulic Oil Temperature Gauge Does Not Move from Minimum or Maximum .1341
Display of Hydraulic Oil Temperature Gauge is Different from Actual Oil Temperature .1343
Some Areas of Machine Monitor Screen are Not Shown 1344
Function Switch Does Not Operate 1345
Automatic Warm-up System Does Not Operate (in Cold Weather) .1346
Auto-Deceleration Monitor Does Not Come On or Go Out While Auto-Deceleration Switch is Operated .1347
Auto-Decelerator is Not Operated or Canceled with Lever .1348
Work Mode Selector Screen is Not Shown While Work Mode Switch is Operated .1349
When Working Mode is Changed, Setting of Engine and Hydraulic Pump is Not Changed .1350
Travel Speed Monitor Does Not Change While Travel Speed Switch is Operated 1351
Travel Speed Does Not Change Even When You Change Travel Speed 1352
Alarm Buzzer Does Not Stop 1354
Service Meter is Not Shown While Starting Switch is in OFF Position .1355
Service Mode Cannot be Selected .1356
All Work Equipment, Swing, Travel Do Not Operate 1357
All Work Equipment, Swing, Travel Cannot be Locked 1361
Machine Does Not Swing While Swing Parking Brake Release Switch is Set to Release Position 1364
While Swing Parking Brake Release Switch is Turned on, Swing Brake is Not Operated 1367
Work Equipment Does Not Operate While Lock Lever Automatic Release Switch is in Release Position 1370
Travel Alarm Does Not Operate During Travel .1373
Travel Alarm Does Not Stop When Machine Stops .1375
Horn Does Not Sound .1377
Horn Does Not Stop 1379
Wiper Monitor Does Not Come On or Go Out While Wiper Switch is Operated .1380
Windshield Wiper Does Not Operate When Wiper Switch is Operated .1381
When Window Washer Switch is Operated, Window Washer Does Not Operate .1383
“Boom Raise” is Not Shown Correctly with Monitoring Function 1384
“Boom Lower” is Not Shown Correctly with Monitoring Function 1385
“Arm OUT” is Not Shown Correctly with Monitoring Function .1386
“Arm IN” is Not Shown Correctly with Monitoring Function 1387
Bucket DUMP is Not Shown Correctly with Monitoring Function .1388
Bucket CURL is Not Shown Correctly with Monitoring Function .1389
Swing is Not Shown Correctly with Monitoring Function .1390
Travel is Not Shown Correctly with Monitoring Function 1391
Service is Not Shown Correctly with Monitoring Function .1392
Blade RAISE is Not Shown Correctly with Monitoring Function .1395
Blade LOWER is Not Shown Correctly with Monitoring Function .1397
KOMTRAX System Does Not Operate Correctly .1399
Troubleshooting for Hydraulic and Mechanical Systems (H Mode) .1400
Information Shown in Troubleshooting Table (H-Mode) .1400
Failure Mode and Cause Table 1401
All Work Equipment, Swing and Travel Do Not Work 1413
All Work Equipment, Swing, and Travel Lack Speed or Power .1414
Fine Control Performance or Response is Unsatisfactory 1416
Unusual Noise is Heard from Around Hydraulic Pump .1417
Engine Speed Drops Largely or Engine Stops 1418
Boom Speed or Power is Low 1420
Arm Speed or Power is Low .1424
Bucket Speed or Power is Low 1427
Blade Speed or Power is Low .1430
Work Equipment Does Not Move in Single Operation 1432
Hydraulic Drift of Boom is Large 1434
Hydraulic Drift of Arm is Large .1435
Hydraulic Drift of Bucket is Large 1436
Hydraulic Drift of Blade is Large .1437
When Single Work Equipment is Released Hydraulically, Other Work Equipment Moves 1439
Time Lag of Work Equipment is Large .1440
Attachment Circuit Cannot be Changed 1441
Oil Flow in Attachment Circuit Cannot be Changed 1442
In Mixed Operation of Work Equipment, Work Equipment with Heavier Load Moves Slower .1443
In Mixed Operation of Work Equipment or Swing and Travel, Travel Speed Falls Largely 1444
In Mixed Operation of Swing and Boom RAISE, Boom RAISE Speed is Low .1446
Machine Does Not Travel Straight 1447
Machine is Not Steered Well or Steering Power is Low 1450
Travel Speed is Low .1453
One of Tracks Does Not Run 1456
Travel Speed Does Not Change, or Travel Speed is Too Slow or Fast .1458
Upper Structure Does Not Swing in Two Directions of Right and Left 1459
Machine Swings Only in One Direction 1461
Swing Acceleration or Swing Speed is Low in Two Directions of Right and Left 1463
Swing Acceleration or Swing Speed is Low in Only One Direction 1465
Upper Structure Overruns Too Much When It Stops Swing Operation (Right and Left) 1467
Upper Structure Overruns Too Much When It Stops Swing Operation (Only One Direction) 1468
Shock is Large When Upper Structure Stops Swing Operation .1469
Large Unusual Noise is Made When Upper Structure Stops Swing Operation 1470
Swing Drift on a Slope is Large (While Swing Parking Brake is Applied) 1471
Swing Drift on a Slope is Large (While Swing Parking Brake is Released) .1472
Fan Speed is Abnormal (Too High or Low, or Does Not Rotate) .1473
Unusual Noise is Heard from Around Fan 1474
Troubleshooting of Engine (S-Mode) 1475
Information Shown in Troubleshooting Table (S-Mode) .1475
Engine Does Not Crank When Starting Switch is Turned to Start Position 1476
Engine Cranks but No Exhaust Smoke Comes Out 1477
Fuel is Sprayed but Engine Does Not Start (Misfiring: Engine Cranks but Does Not Start) .1478
Engine Startability is Unsatisfactory .1479
Engine Does Not Pick Up Smoothly 1481
Engine Stops During Operation .1483
Engine Does Not Rotate Smoothly .1485
Engine Lacks Output (or Lacks Power) 1486
Exhaust Color is Black (KDPF Becomes Clogged in Short Time) .1488
Engine Oil Consumption is Excessive .1490
Engine Oil Becomes Dirty Quickly 1491
Fuel Consumption is Excessive .1492
Oil is in Coolant (or Coolant Spurts Back or Coolant Level Goes Down) .1493
Engine Oil Pressure Drops .1494
Fuel Mixes Into Engine Oil 1495
Water Mixes Into Engine Oil (Milky) .1496
Coolant Temperature Increases Too High (Overheat) .1497
Unusual Noise is Heard 1498
Vibration is Excessive 1500
Air Cannot be Bled from Fuel Circuit 1501
Active Regeneration is Done Frequently 1502
Active Regeneration Continues Long 1503
White Smoke is Exhausted During Active Regeneration .1504
50 Disassembly and Assembly .1505
Table of Contents .1506
Precautions Before Work .1511
Related Information on Disassembly and Assembly .1512
How to Read This Manual .1512
Coating Materials List 1513
Special Tool List .1518
Sketches of Special Tools .1534
Prepare .1537
Drain and Add Coolant .1537
How to Drain Coolant 1538
How to Add Coolant 1539
Drain and Add Hydraulic Oil .1540
How to Drain Hydraulic Oil 1541
How to Add Hydraulic Oil 1542
Drain and Add Fuel 1544
How to Drain Fuel .1545
How to Add Fuel .1545
Collect and Refill Refrigerant 1547
How to Collect Refrigerant 1547
How to Refill Refrigerant .1548
Engine and Cooling System .1549
Remove and Install Supply Pump Assembly .1549
How to Remove Supply Pump Assembly 1550
How to Install Supply Pump Assembly .1560
Remove and Install Injector Assembly 1569
How to Remove Injector Assembly .1570
How to Install Injector Assembly 1574
Remove and Install Cylinder Head Assembly .1581
How to Remove Cylinder Head Assembly 1583
How to Install Cylinder Head Assembly .1611
Remove and Install EGR Valve Assembly .1651
How to Remove EGR Valve Assembly 1652
How to Install EGR Valve Assembly .1653
Remove and Install EGR Cooler Assembly 1656
How to Remove EGR Cooler Assembly .1657
How to Install EGR Cooler Assembly 1663
Remove and Install Starter Assembly .1669
How to Remove Starting Motor Assembly .1670
How to Install Starting Motor Assembly 1672
Remove and Install Fan Belt .1676
How to Remove Fan Belt 1677
How to Install Fan Belt .1679
Remove and Install Automatic Tensioner 1681
How to Remove Auto-Tensioner 1681
How to Install Auto-Tensioner .1682
Remove and Install Expansion Tank Assembly 1683
How to Remove Expansion Tank Assembly .1684
How to Install Expansion Tank Assembly 1688
Remove and Install Radiator Assembly 1693
How to Remove Radiator Assembly .1694
How to Install Radiator Assembly 1697
Remove and Install Hydraulic Oil Cooler Assembly 1700
How to Remove Hydraulic Oil Cooler Assembly .1701
How to Install Hydraulic Oil Cooler Assembly 1710
Remove and Install Aftercooler Assembly .1719
How to Remove Aftercooler Assembly 1720
How to Install Aftercooler Assembly .1722
Remove and Install Engine and Main Pump Assembly 1725
How to Remove Engine and Main Pump Assembly .1727
How to Install Engine and Main Pump Assembly 1749
Remove and Install Engine Front Oil Seal 1774
How to Remove Engine Front Oil Seal .1775
How to Install Engine Front Oil Seal 1776
Remove and Install Engine Rear Oil Seal .1778
How to Remove Engine Rear Oil Seal 1779
How to Install Engine Rear Oil Seal .1781
Remove and Install Fuel Cooler Assembly .1785
How to Remove Fuel Cooler Assembly 1786
How to Install Fuel Cooler Assembly .1786
Remove and Install Engine Hood Assembly .1788
How to Remove Engine Hood Assembly 1788
How to Install Engine Hood Assembly .1791
Remove and Install KDPF Assembly 1794
How to Remove KDPF Assembly .1795
How to Install KDPF Assembly 1803
Disassemble and Assemble KDPF Assembly 1815
How to Disassemble KDPF Assembly 1817
How to Assemble KDPF Assembly .1821
Remove and Install Fuel Tank Assembly .1827
How to Remove Fuel Tank Assembly 1828
How to Install Fuel Tank Assembly .1832
Remove and Install Air Cleaner Assembly .1837
How to Remove Air Cleaner Assembly 1838
How to Install Air Cleaner Assembly .1839
Remove and Install Air Conditioner Compressor Assembly 1842
How to Remove Air Conditioner Compressor Assembly .1843
How to Install Air Conditioner Compressor Assembly 1845
Remove and Install Air Conditioner Condenser Assembly .1847
How to Remove Air Conditioner Condenser Assembly 1848
How to Install Air Conditioner Condenser Assembly .1850
Power Train .1852
Remove and Install Travel Motor and Final Drive Assembly 1852
How to Remove Travel Motor and Final Drive Assembly .1853
How to Install Travel Motor and Final Drive Assembly 1856
Disassemble and Assemble Travel Motor and Final Drive Assembly 1860
How to Disassemble Travel Motor and Final Drive Assembly 1869
How to Assemble Travel Motor and Final Drive Assembly .1889
Remove and Install Swing Motor and Swing Machinery Assembly .1908
How to Remove Swing Motor and Swing Machinery Assembly 1909
How to Install Swing Motor and Swing Machinery Assembly .1914
Disassemble and Assemble Swing Machinery Assembly .1919
How to Disassemble Swing Machinery Assembly .1920
How to Assemble Swing Machinery Assembly 1923
Remove and Install Swing Circle Assembly 1929
How to Remove Swing Circle Assembly .1929
How to Install Swing Circle Assembly 1930
Undercarriage and Frame .1931
Separate and Connect Track Assembly .1931
How to Separate Track Assembly 1932
How to Install Track Assembly .1932
Remove and Install Sprocket .1934
How to Remove Sprocket 1934
How to Install Sprocket .1935
Remove and Install Idler and Idler Cushion Assembly .1936
How to Remove Idler and Idler Cushion Assembly 1936
How to Install Idler and Idler Cushion Assembly .1937
Disassemble and Assemble Idler Assembly .1938
How to Disassemble Idler Assembly .1938
How to Assemble Idler Assembly 1939
Disassemble and Assemble Idler Cushion Assembly .1942
How to Disassemble Idler Cushion Assembly .1942
How to Assemble Idler Cushion Assembly 1943
Disassemble and Assemble Track Roller Assembly 1945
How to Disassemble Track Roller Assembly 1945
How to Assemble Track Roller Assembly .1947
Remove and Install Revolving Frame Assembly .1950
How to Remove Revolving Frame Assembly 1951
How to Install Revolving Frame Assembly .1958
Remove and Install Counterweight Assembly .1966
How to Remove Counterweight Assembly 1967
How to Install Counterweight Assembly .1972
Hydraulic System 1978
Remove and Install Center Swivel Joint Assembly .1978
How to Remove Center Swivel Joint Assembly 1980
How to Install Center Swivel Joint Assembly .1985
Disassemble and Assemble Center Swivel Joint Assembly .1991
How to Disassemble Center Swivel Joint Assembly .1991
How to Assemble Center Swivel Joint Assembly 1992
Remove and Install Hydraulic Tank Assembly 1993
How to Remove Hydraulic Tank Assembly .1994
How to Install Hydraulic Tank Assembly 1998
Remove and Install Main Pump Assembly .2003
How to Remove Main Pump Assembly 2004
How to Install Main Pump Assembly .2012
Remove and Install Control Valve Assembly .2021
How to Remove Control Valve Assembly 2023
How to Install Control Valve Assembly .2043
Disassemble and Assemble Control Valve Assembly .2064
How to Assemble Control Valve Assembly 2064
How to Replace Pressure Reducing Valve Cartridge Assembly .2066
Disassemble and Assemble Work Equipment PPC Valve Assembly 2069
How to Disassemble Work Equipment PPC Valve Assembly 2069
How to Assemble Work Equipment PPC Valve Assembly .2070
Disassemble and Assemble Travel PPC Valve Assembly 2072
How to Disassemble Travel PPC Valve Assembly 2072
How to Assemble Travel PPC Valve Assembly .2073
Work Equipment 2075
Remove and Install Blade Assembly .2075
How to Remove Blade Assembly 2076
How to Install Blade Assembly .2078
Remove and Install Work Equipment Assembly 2081
How to Remove Work Equipment Assembly .2083
How to Install Work Equipment Assembly 2089
Remove and Install Boom Anti-drop Valve Assembly 2095
How to Remove Boom Anti-drop Valve Assembly .2096
How to Install Boom Anti-drop Valve Assembly 2100
Remove and Install Arm Anti-Drop Valve Assembly .2103
How to Remove Arm Anti-Drop Valve Assembly 2104
How to Install Arm Anti-Drop Valve Assembly .2107
Disassemble and Assemble Anti-Drop Valve Assembly .2109
How to Disassemble Anti-Drop Valve Assembly .2109
How to Assemble Anti-Drop Valve Assembly 2109
Disassemble and Assemble Boom Cylinder Assembly .2110
How to Disassemble Boom Cylinder Assembly .2110
How to Assemble Boom Cylinder Assembly 2112
Disassemble and Assemble Arm Cylinder Assembly 2115
How to Disassemble Arm Cylinder Assembly 2115
How to Assemble Arm Cylinder Assembly .2117
Disassemble and Assemble Bucket Cylinder Assembly .2121
How to Disassemble Bucket Cylinder Assembly .2121
How to Assemble Bucket Cylinder Assembly 2123
Disassemble and Assemble Blade Cylinder Assembly 2126
How to Disassemble Blade Cylinder Assembly 2126
How to Assemble Blade Cylinder Assembly .2128
CAB Related Parts .2131
Remove and Install Operator Cab Assembly 2131
How to Remove Operator Cab Assembly .2132
How to Install Operator Cab Assembly 2148
Remove and Install Slide Door .2164
How to Remove Slide Door 2164
How to Install Slide Door .2164
Remove and Install Operator Cab Glass (Adhered Glass) .2166
How to Remove Operator Cab Glass (Adhered Glass) 2167
How to Install Operator Cab Glass (Adhered Glass) .2168
Remove and Install Front Window Assembly 2177
How to Remove Front Window Assembly .2177
How to Install Front Window Assembly 2179
Remove and Install Floor Frame Assembly .2181
How to Remove Floor Frame Assembly 2182
How to Install Floor Frame Assembly .2191
Remove and Install Air Conditioner Unit Assembly 2201
How to Remove Air Conditioner Unit Assembly .2202
How to Install Air Conditioner Unit Assembly 2215
Remove and Install Operator Seat 2228
How to Remove Operator Seat .2229
How to Install Operator Seat 2230
How to Remove and Install Seat Belt .2233
How to Remove Seat Belt .2234
How to Install Seatbelt .2234
Remove and Install Work Equipment Control Lever Assembly 2235
How to Remove Work Equipment Control Lever Assembly .2235
How to Install Work Equipment Control Lever Assembly 2241
Remove and Install Front Wiper Assembly .2249
How to Remove Front Wiper Assembly 2250
How to Install Front Wiper Assembly .2256
Electrical System .2262
Remove and Install Engine Controller Assembly .2262
How to Remove Engine Controller Assembly 2263
How to Install Engine Controller Assembly .2265
Remove and Install Pump Controller Assembly .2268
How to Remove Pump Controller Assembly 2269
How to Install Pump Controller Assembly .2271
Remove and Install Machine Monitor Assembly .2273
How to Remove Machine Monitor Assembly 2274
How to Install Machine Monitor Assembly .2279
Remove and Install Mass Air Flow and Temperature Sensor .2284
How to Remove Mass Air Flow and Temperature Sensor 2285
How to Install Mass Air Flow and Temperature Sensor .2286
Remove and Install KDPF Temperature Sensor 2287
How to Remove KDPF Temperature Sensor .2288
How to Install KDPF Temperature Sensor 2292
Remove and Install KDPF Differential Pressure Sensor 2296
How to Remove KDPF Differential Pressure Sensor .2297
How to Install KDPF Differential Pressure Sensor 2299
Remove and Install Camera Assembly 2301
How to Remove Camera Assembly .2301
How to Install Camera Assembly 2305
Remove and Install Gateway Function Controller 2309
How to Remove Gateway Function Controller .2310
How to Install Gateway Function Controller 2312
60 Maintenance Standard .2315
Table of Contents .2316
Engine and Cooling System .2317
Maintenance Standard for Engine Mount .2317
Maintenance Standard for PTO 2318
Maintenance Standard for Cooling System .2319
Power Train .2320
Maintenance Standard for Swing Circle .2320
Maintenance Standard for Swing Machinery 2322
Maintenance Standard for Sprocket .2324
Undercarriage and Frame .2325
Maintenance Standard for Track Frame and Idler Cushion 2325
Maintenance Standard for Idler 2327
Maintenance Standard for Track Roller .2329
Maintenance Standard for Carrier Roller .2330
Maintenance Standard for Track Shoes 2331
Maintenance Standard for Triple Shoes .2334
Maintenance Standard for Rubber Shoes .2335
Hydraulic System 2336
Maintenance Standard for Hydraulic Tank .2336
Maintenance Standard for Main Pump 2337
Maintenance Standard for Main Pump Servo Valve 2341
Maintenance Standard for PC-EPC Valve .2342
Maintenance Standard for Swing Motor 2343
Maintenance Standard for Travel Motor .2345
Maintenance Standard for Control Valve 2346
Maintenance Standard for Boom Anti-Drop Valve .2356
Maintenance Standard for Arm Anti-Drop Valve 2358
Maintenance Standard for Work Equipment and Swing PPC Valve .2360
Maintenance Standard for Blade PPC Valve 2363
Maintenance Standard for Travel PPC Valve .2365
Maintenance Standard for 1st-Line Attachment PPC Valve (with EPC Valve) .2368
Maintenance Standard for EPC Valve of 1st-Line Attachment PPC Valve .2369
Maintenance Standard for Solenoid Valve .2371
Maintenance Standard for Attachment Circuit Accumulator (For Low Pressure Circuit) 2372
Maintenance Standard for Center Swivel Joint 2373
Work Equipment 2374
Maintenance Standard for Work Equipment Linkage .2374
Dimensions of Arm .2379
Dimensions of Bucket 2381
Maintenance Standard for Boom Cylinder 2383
Maintenance Standard for Arm Cylinder .2384
Maintenance Standard for Bucket Cylinder 2385
Maintenance Standard for Blade Cylinder .2386
80 Appendix .2387
Table of Contents .2388
Precautions Before Work .2390
Air Conditioner System 2391
Precautions for Refrigerant .2391
Air Conditioner Component .2392
Specifications of Air Conditioner .2394
Structure and Function of Refrigeration Cycle .2395
Outline of Refrigeration Cycle 2396
Component Parts of Air Conditioner System .2398
Air Conditioner Unit 2398
Configuration Diagram of Air Conditioner Unit .2398
Function of Air Conditioner Unit 2400
Component Parts of Air Conditioner Unit .2401
Function of Evaporator as Air Conditioner Unit Component 2402
Function of Heater Core as Air Conditioner Unit Component .2402
Function of Evaporator Temperature Sensor as Air Conditioner Unit Component .2402
Function of Servo Motor as Air Conditioner Unit Component .2403
Structure of Expansion Valve as Air Conditioner Unit Component 2404
Function of Expansion Valve as Air Conditioner Unit Component .2404
Operate Expansion Valve as Air Conditioner Unit Component .2404
Function of Dual Pressure Switch 2405
Air Conditioner Controller 2406
Structure of Air Conditioner Controller .2406
Compressor 2407
Structure of Compressor .2407
Specifications of Compressor 2407
Function of Compressor 2407
Condenser .2408
Structure of Condenser 2408
Specifications of Condenser .2408
Function of Condenser .2408
Receiver Drier 2409
Structure of Receiver Dryer .2409
Specifications of Receiver Dryer 2409
Function of Receiver Dryer 2409
Air Conditioner Related Sensors .2410
Structure of Sunlight Sensor 2410
Function of Sunlight Sensor .2410
Structure of Outside Temperature Sensor .2410
Function of Outside Air Temperature Sensor 2410
Explanation of Procedure for Test of and Troubleshooting of Air Conditioner .2412
Circuit Diagram and Configuration of Connector Pins of Air Conditioner 2414
System Diagram of Air Conditioner .2416
Input and Output Signals of Air Conditioner Controller 2417
Function of Air Conditioner Controller 2418
Locations of Air Conditioner Parts and Layout of Connectors .2419
Examine Air Leakage (Duct) 2425
How to Examine Air Leakage (Duct) .2425
Examine Air Conditioner with Self-Diagnosis Function 2426
Open the Electrical System Abnormality Record Screen in Service Mode of Machine Monitor .2427
Examine Vent (Mode) Changeover 2428
How to Examine Vent (Mode) Changeover .2428
Examine Fresh/Recirc Air Changeover .2429
How to Examine Fresh/Recirc Air Changeover 2429
Examine Sunlight Sensor .2430
How to Examine Sunlight Sensor 2430
Examine Refrigerant (Dual) Pressure Switch 2431
How to Examine Refrigerant (Dual) Pressure Switch .2431
Examine Relay .2433
How to Examine Relay 2433
Air Conditioner Troubleshooting Chart 1 .2434
Air Conditioner Troubleshooting Chart 2 .2435
Information Shown in Troubleshooting Table 2438
Failure Code [879AKA] .2439
Failure Code [879AKB] .2440
Failure Code [879BKA] .2441
Failure Code [879BKB] .2443
Failure Code [879CKA] .2445
Failure Code [879CKB] .2446
Failure Code [879DKZ] .2447
Failure Code [879EMC] .2449
Failure Code [879FMC] .2450
Failure Code [879GKX] .2451
Troubleshooting for Power Supply System (Air Conditioner Does Not Operate) 2453
Troubleshooting for Compressor and Refrigerant System (Air is Not Cooled) .2455
Troubleshooting for Blower Motor System (No Air Comes Out or Air Flow is Abnormal) 2458
Troubleshooting for Fresh/Recirc Air Changeover .2460
Troubleshooting by Gauge Pressure .2462
Connect Service Tool 2465
How to Connect Service Tool .2465
Precautions for Disconnection and Connection of Air Conditioner Piping 2467
Handle Compressor Oil .2469
90 Circuit Diagrams .2471
Table of Contents .2472
How to Read the Codes for Electric Cable 2473
Hydraulic Circuit Diagram .2477
Symbols Used in Hydraulic Circuit Diagram .2477
Hydraulic Circuit Diagram .2481
Hydraulic Circuit Diagram (at Boom RAISE Operation) .2483
Hydraulic Circuit Diagram (at Left Swing Operation) .2485
Hydraulic Circuit Diagram (at Boom RAISE and Left Swing Operation) 2487
Electrical Circuit Diagram 2489
Symbols Used in Electric Circuit Diagram 2489
Electrical Circuit Diagram (Applicable Machine: 50001 to 52185) (1/9) .2493
Electrical Circuit Diagram (Applicable Machine: 50001 to 52185) (2/9) .2495
Electrical Circuit Diagram (Applicable Machine: 50001 to 52185) (3/9) .2497
Electrical Circuit Diagram (Applicable Machine: 50001 to 52185) (4/9) .2499
Electrical Circuit Diagram (Applicable Machine: 50001 to 52185) (5/9) .2501
Electrical Circuit Diagram (Applicable Machine: 50001 to 52185) (6/9) .2503
Electrical Circuit Diagram (Applicable Machine: 50001 to 52185) (7/9) .2505
Electrical Circuit Diagram (Applicable Machine: 50001 to 52185) (8/9) .2507
Electrical Circuit Diagram (Applicable Machine: 50001 to 52185) (9/9) .2509
Electrical Circuit Diagram (Applicable Machine: 52186 and Up) (1/9) .2511
Electrical Circuit Diagram (Applicable Machine: 52186 and Up) (2/9) .2513
Electrical Circuit Diagram (Applicable Machine: 52186 and Up) (3/9) .2515
Electrical Circuit Diagram (Applicable Machine: 52186 and Up) (4/9) .2517
Electrical Circuit Diagram (Applicable Machine: 52186 and Up) (5/9) .2519
Electrical Circuit Diagram (Applicable Machine: 52186 and Up) (6/9) .2521
Electrical Circuit Diagram (Applicable Machine: 52186 and Up) (7/9) .2523
Electrical Circuit Diagram (Applicable Machine: 52186 and Up) (8/9) .2525
Electrical Circuit Diagram (Applicable Machine: 52186 and Up) (9/9) .2527
Index 2529

DESCRIPTION:

Komatsu Hydraulic Excavator PC78US-11E0 Shop Manual SEN06854-08 –  PDF DOWNLOAD

• SERIAL NUMBERS 50001 and up

G.B 27/12/24