Description
Komatsu PC300-7 PC300LC-7 PC350-7 PC350LC-7 Shop Manual SEBM025804 PDF
The Komatsu PC300-7 PC300LC-7 PC350-7 PC350LC-7 Shop Manual SEBM025804 PDF is a detailed workshop reference for service, inspection, adjustment, troubleshooting, removal, installation, disassembly and assembly work on the covered machines. It applies to PC300-7 and PC300LC-7 machines from serial number 40001 and up, and PC350-7 and PC350LC-7 machines from serial number 20001 and up. The manual combines machine specifications and maintenance standards with extensive hydraulic, control, travel, swing, work-equipment and electrical information.
Komatsu identifies the SAA6D114E engine for these models. The manual includes engine-related specifications, tests and selected removal and installation procedures, but it also states that detailed engine information is contained in the separate 114 Series Engine Shop Manual. This makes SEBM025804 especially useful as the chassis and machine-system shop manual for the PC300/350(LC)-7 series while clearly defining where separate engine-series information may be required.
File Details
- Manual type: Shop Manual
- Brand: Komatsu
- Models: PC300-7, PC300LC-7, PC350-7, PC350LC-7
- Serial coverage: PC300-7 and PC300LC-7: 40001 and up; PC350-7 and PC350LC-7: 20001 and up
- Engine identified: SAA6D114E
- Language: English
- Pages: 643
- File format: PDF
- Document number: SEBM025804
- Publication marking: 2002; Printed in Japan 11-02 (01)
Machine and Service Information
The manual begins with dimensional drawings, working ranges, specifications, component weights, and fuel, coolant and lubricant data. The specification pages distinguish the standard and LC configurations and provide values for machine dimensions, operating weight, digging ranges, travel and swing performance, engine data, electrical equipment, undercarriage arrangement and hydraulic equipment. The SAA6D114E data includes engine type, bore and stroke, displacement, output and torque figures, while hydraulic pages identify major components such as the HPV125+125 main pump, HMV160ADT-2 travel motor and KMF230ABE-5 swing motor.
Maintenance-standard sections go beyond basic component identification. They show construction, operating principles, clearances, wear limits, spring dimensions, gear backlash, track and roller criteria, hydraulic-cylinder clearances and work-equipment pin and bushing limits. This gives the technician reference values for deciding whether parts are within standard, require adjustment, or have reached a repair limit.
Hydraulic, Control and Electronic Coverage
A large portion of this Komatsu PC300-7 and PC350-7 shop manual is devoted to hydraulic operation. It explains the hydraulic pump, LS and PC control, variable-volume control, the control valve, Closed Center Load Sensing System (CLSS), self-pressure reducing valve, travel and swing circuits, PPC valves, solenoid valves, hydraulic drift prevention, quick-return functions and attachment circuit selection. Diagrams trace component layouts and oil flow so that pressure checks and operating symptoms can be related to the system involved.
The electronic-control material includes engine control, the electronic control system, multi-monitor and 7-segment monitor functions, sensors and service-menu functions. Testing and troubleshooting sections use monitor information, service codes, failure histories, wiring checks, resistance and voltage measurements, and system-specific diagnostic procedures. The final Others section provides a hydraulic circuit diagram plus four parts of the electrical circuit diagram.
Chapters Covered
- 01 General
- Specification dimension drawings and working ranges
- Specifications for PC300-7 / PC300LC-7
- Specifications for PC350-7 / PC350LC-7
- Weight tables for the covered models
- Fuel, coolant and lubricants
- 10 Structure, Function and Maintenance Standard
- Engine related parts; radiator, oil cooler and aftercooler
- Power train, final drive, swing machinery and swing circle
- Track frame and recoil spring; idler, carrier roller, track roller and track shoe
- Hydraulic equipment layout, hydraulic tank and HPV125+125 hydraulic pump
- Variable volume valve, control valve and CLSS
- Self pressure reducing valve and swing motor
- Reverse prevention valve and center swivel joint
- HMV160ADT-2 travel motor and travel junction valve
- Travel PPC shuttle valve and valve control
- Work equipment / swing PPC valve, travel PPC valve and service PPC valve
- Solenoid valve, PPC accumulator and return oil filter
- Boom hydraulic drift prevention valve, quick return valve and lift check valve
- Attachment circuit selector valve, hydraulic cylinders and work equipment
- Air conditioner, engine control and electronic control system
- Multi-monitor system, 7-segment monitor system and sensors
- 20 Testing and Adjusting
- Standard value tables for engine-related and chassis-related parts
- Tools for testing, adjusting and troubleshooting
- Engine RPM inspection and adjustment; air boost pressure and exhaust gas color measurement
- Valve clearance, compression pressure, blow-by pressure and fuel injection timing checks
- Engine oil pressure, engine speed sensor and air-compressor belt inspection
- Swing-circle bearing clearance, track shoe tension and sprocket wear
- Hydraulic pressure checks for work equipment, swing and travel
- Control circuit, pump PC control and pump LS control pressure checks
- Solenoid valve and PPC valve output pressure measurements
- Work equipment and swing PPC valve adjustment
- Hydraulic drift checks, residual-pressure release, oil-leakage measurement and air bleeding
- Diode inspection, multi-monitor special functions and 7-segment monitor functions
- Electrical-system troubleshooting preparation and detailed troubleshooting
- 30 Disassembly and Assembly
- How to read the procedures, operating precautions and special tool list
- Starting motor and fuel injection pump assemblies
- Engine front seal, engine rear seal and cylinder head assembly
- Radiator and hydraulic oil cooler assemblies
- Engine and hydraulic pump assemblies
- Final drive; swing motor and swing machinery
- Carrier roller, track roller, idler and recoil spring assemblies
- Sprocket, track shoe and swing circle assemblies
- Revolving frame and center swivel joint assemblies
- Hydraulic tank, control valve and hydraulic pump assemblies
- Work equipment PPC valve and travel PPC valve assemblies
- Hydraulic cylinder and work equipment assemblies
- Air conditioner unit, counterweight and operator cab assemblies
- Monitor and governor pump controller assemblies
- 90 Others
- Hydraulic circuit diagram
- Electrical circuit diagram, parts 1 through 4
Taken together, these chapters let a technician move from identifying the machine and checking standard values to understanding system operation, measuring pressures and performance, tracing faults, and carrying out component removal or overhaul procedures. The maintenance-standard material is particularly valuable during inspection because it supplies concrete criteria for wear, clearance and adjustment rather than relying only on visual judgement.
Complete PDF Bookmark Tree
Complete Bookmarks
The complete bookmarks in the “Komatsu PC300-7 PC300LC-7 PC350-7 PC350LC-7 Shop Manual SEBM025804 PDF” are as follows:
MAIN MENU
COVERp. 1
CONTENTSp. 2
+FOREWORDp. 9
HOW TO READ THE SHOP MANUALp. 10
HOISTING INSTRUCTIONSp. 11
METHOD OF DISSASSEMBLY, CONNECTING PUSH-RULL TYPE COUPLERp. 12
COATING MATERIALSp. 14
STANDARD TIGHTENING TORQUEp. 16
CONVERSION TABLEp. 20
UNITSp. 26
+01 GENERALp. 27
SPECIFICATION DIMENSION DRAWINGSp. 28
+SPECIFICATIONSp. 30
PC300-7, PC300LC-7p. 30
PC350-7, PC350LC-7p. 32
+WEIGHT TABLEp. 34
PC300-7, PC300LC-7p. 34
PC350-7, PC350LC-7p. 36
FUEL, COOLANT AND LUBRICANTSp. 38
+10 STRUCTURE, FUNCTION AND MAINTENANCE STANDARDp. 39
ENGINE RELATED PARTSp. 40
RADIATOR – OIL COOLER – AFTERCOOLERp. 41
POWER TRAINp. 42
FINAL DRIVEp. 44
SWING MACHINERYp. 46
SWING CIRCLEp. 48
TRACK FRAME – RECOIL SPRINGp. 50
IDLERp. 52
CARRIER ROLLERp. 54
TRACK ROOLERp. 55
TRACK SHOEp. 56
HYDRAULIC EQUIPMENT LAYOUT DRAWINGp. 60
HYDRAULIC TANKp. 62
HYDRAULIC PUMPp. 64
VARIABLE VOLUME VALVEp. 85
CONTROL VALVEp. 88
CLSSp. 104
SELF PRESSURE REDUCING VALVEp. 107
SWING MOTORp. 110
REVERSE PREVENTION VALVEp. 115
CENTER SWIVEL JOINTp. 117
TRAVEL MOTORp. 118
TRAVEL JUNCTION VALVEp. 128
TRAVEL PPC SHUTTLE VALVEp. 130
VALVE CONTROLp. 134
WORK EQUIPMENT – SWING PPC VALVEp. 135
TRAVEL PPC VALVEp. 139
SERVICE PPC VALVEp. 148
SOLENOID VALVEp. 151
PPC ACCUMULATORp. 153
RETURN OIL FILTERp. 154
BOOM HYDRAULIC DRIFT PREVENTION VALVEp. 156
QUICK RETURN VALVEp. 162
LIFT CHECK VALVEp. 164
ATTACHMENT CIRCUIT SELECTOR VALVEp. 165
HYDRAULIC CYLINDERp. 167
WORK EQUIPMENTp. 169
AIR CONDITIONERp. 175
ENGINE CONTROLp. 176
ELECTRONIC CONTROL SYSTEMp. 182
MULTI MONITOR SYTEMp. 206
7-SEGMENT MONITOR SYSTEMp. 226
SENSORp. 233
+20 TESTING AND ADJUSTINGp. 236
STANDARD VALVE TABLE FOR ENGINE RELATED PARTSp. 237
STANDARD VALVE TABLE FOR CHASSIS RELATED PARTSp. 238
+TESTING AND ADJUSTINGp. 246
TOOLS FOR TESTING, ADJUSTING AND TROUBLESHOOTINGp. 247
INSPECTION AND ADJUSTMENT OF ENGINE RPMp. 249
MEASUREMENT OF AIR BOOST PRESSUREp. 251
MEASUREMENT OF EXHAUST GAS COLORp. 252
ADJUSTMENT OF VALVE CLEARANCEp. 253
MEASUREMENT OF COMPRESSION PRESSUREp. 255
MEASUREMENT OF BLOW-BY PRESSUREp. 256
INSPECTION AND ADJUSTMENT OF FUEL INJECTION TIMINGp. 257
MEASUREMENT OF ENGINE OIL PRESSUREp. 259
ADJUSTMENT OF ENGINE SPEED SENSORp. 260
INSPECTION AND ADJUSTMENT OF AIR COMPRESSOR BELT TENSIONp. 260
EMERGENCY ESCAPE FROM FAILURE IN ENGINE CONTROL SYSTEMp. 261
MEASUREMENT OF CLEARANCE IN SWING CIRCLE BEARINGSp. 262
INSPECTION AND ADJUSTMENT OF TRACK SHOE TENSIONp. 263
INSPECTION OF WEAR ON SPROCKETp. 263
INSPECTION AND ADJUSTMENT OF HYDRAULIC OIL PRESSURE IN HYDRAULIC CIRCUIT FOR WORK EQUIPMENT, SWING AND TRAVELp. 264
INSPECTION AND ADJUSTMENT OF CONTROL CIRCUIT OIL PRESSUREp. 268
INSPECTION AND ADJUSTMENT OF PUMP PC CONTROL CIRCUIT OIL PRESSUREp. 269
INSPECTION AND ADJUSTMENT OF PUMP LS CONTROL CIRCUIT OIL PRESSUREp. 272
MEASUREMENT OF SOLENOID VALVE OUTPUT PRESSUREp. 276
MEASUREMENT OF PPC VALVE OUTPUT PRESSUREp. 279
ADJUSTMENT OF WORK EQUIPMENT AND SWING PPC VALVEp. 280
INSPECTION OF LOCATIONS OF HYDRAULIC DRIFT OF WORK EQUIPMENTp. 281
RELEASE OF REMAINING PRESSURE IN HYDRAULIC CIRCUITp. 282
MEASUREMENT OF OIL LEAKAGE AMOUNTp. 283
AIR BLEEDING OF VARIOUS PARTSp. 285
INSPECTION PROCEDURES FOR DIODEp. 287
SPECIAL FUNCTION OF MULTI-MONITOR PANELp. 288
DISPLAY METHOD AND SPECIAL FUNCTIONS OF 7-SEGMENT MONITOR PANELp. 312
PREPARATIONS FOR TROUBLESHOOTING ELECTRICAL SYSTEMp. 325
+TROUBLESHOOTINGp. 330
POINTS TO REMEMBER WHEN TROUBLESHOOTINGp. 331
SEQUENCE OF EVENTS IN TROUBLESHOOTINGp. 332
POINTS TO REMEMBER WHEN CARRYING OUT MAINTENANCEp. 333
CHECKS BEFORE TROUBLESHOOTINGp. 341
CLASSIFICATION AND STEPS FOR TROUBLESHOOTINGp. 342
CONNECTOR LOCATION CHART AND ELECTRICAL CIRCUIT DIAGRAM BY SYSTEMp. 346
CONNECTION TABLE FOR CONNECTOR PIN NUMBERSp. 364
+TROUBLESHOOTING WHEN SERVICE CODE "ELECTRICAL SYSTEM" AND FAILURE CODE "MECHANICAL SYSTEM" ARE INDICATEDp. 386
INFORMATION CONTAINED IN TROUBLESHOOTING TABLEp. 388
SERVICE CODE IN ELECTRICAL SYSTEM [E101] (ABNORMAL DATA IN ERROR HISTORY)p. 390
SERVICE CODE IN ELECTRICAL SYSTEM [E112] (SHORT-CIRCUITING IN NORMAL ROTATION SYSTEM OF WINDSHEILD WIPER MOTOR DRIVE)p. 392
SERVICE CODE IN ELECTRICAL SYSTEM [E113] (SHORT-CIRCUITING IN NORMAL ROTATION SYSTEM OF WINDSHEILD WIPER MOTOR DRIVE)p. 394
SERVICE CODE IN ELECTRICAL SYSTEM [E114] (SHORT-CIRCUITING IN WINDOW WASHER DRIVE SYSTEM)p. 396
SERVICE CODE IN ELECTRICAL SYSTEM [E115] (ABNORMAL WINDSHIELD WIPER MOTION)p. 398
SERVICE CODE IN ELECTRICAL SYSTEM [E116] (ABNORMALITY IN RETRACTING WINDSHELID WIPER)p. 400
SERVICE CODE IN ELECTRICAL SYSTEM [E201] (SHORT-CIRCUITING IN TRAVEL INTERLOCKING SOLENOID)p. 402
SERVICE CODE IN ELECTRICAL SYSTEM [E203] (SHORT-CIRCUITING IN SWING AQND PARKING BRAKE SOLENOID-IN GOVERNOR – PUMP CONTROLLERp. 404
SERVICE CODE IN ELECTRICAL SYSTEM [E204] (SHORT-CIRCUITING IN MERGE/DIVIDE SOLENOID)p. 406
SERVICE CODE IN ELECTRICAL SYSTEM [E205] (SHORT-CIRCUITING IN 2-STAGE RELIEF SOLENOID)p. 408
SERVICE CODE IN ELECTRICAL SYSTEM [E206] (SHORT-CIRCUITING IN TRAVEL SPEED SHIFTING SOLENOID)p. 410
SERVICE CODE IN ELECTRICAL SYSTEM [E211] (DISCONNECTION IN TRAVEL INTERLOCKING SOLENOIDp. 412
SERVICE CODE IN ELECTRICAL SYSTEM [E213] (DISCONNECTION IN SWING PARKING BRAKE SOLENOID)p. 414
SERVICE CODE IN ELECTRICAL SYSTEM [E214] (DISCONNECTION MERGE/DIVIDE SOLENOID)p. 416
SERVICE CODE IN ELECTRICAL SYSTEM [E215] (DISCONNECTION IN 2-STAGE RELIEF SOLENOID)p. 418
SERVICE CODE IN ELECTRICAL SYSTEM [E216] (DISCONNECTION IN TRAVEL SPEED SHIFTING SOLENOID)p. 420
SERVICE CODE IN ELECTRICAL SYSTEM [E217] (ABNORMALITY IN INPUTTING MODEL CODE)p. 422
SERVICE CODE IN ELECTRICAL SYSTEM [E218] (DISCONNECTION OF S-NET SIGNAL)p. 424
SERVICE CODE IN ELECTRICAL SYSTEM [E222] (SHORT-CIRCUITING IN LS-EPC SOLENOID)p. 426
SERVICE CODE IN ELECTRICAL SYSTEM [E223] (DISCONNECTION IN LS-EPC SOLENOID)p. 427
SERVICE CODE IN ELECTRICAL SYSTEM [E224] (ABNORMALITY IN F PUMP PRESSURE SENSOR)p. 428
SERVICE CODE IN ELECTRICAL SYSTEM [E225] (ABNORMALITY IN R PUMP PRESSURE SENSOR)p. 430
SERVICE CODE IN ELECTRICAL SYSTEM [E226] (ABNORMALITY IN PRESSURE SENSOR POWER SOURCE)p. 432
SERVICE CODE IN ELECTRICAL SYSTEM [E227] (ABNORMALITY IN ENGINE ROTATION SENSOR IN GOVERNOR – PUMP CONTROLLER SYSTEM)p. 434
SERVICE CODE IN ELECTRICAL SYSTEM [E228] (SHORT-CIRCUITING IN ATTACHMENT RETURN SWITCHING RELAY)p. 435
SERVICE CODE IN ELECTRICAL SYSTEM [E232] (SHORT-CIRCUITING IN PC-EPC SOLENOID)p. 436
SERVICE CODE IN ELECTRICAL SYSTEM [E233] (DISCONNECTION IN PC-EPC SOLENOID SYSTEM)p. 438
SERVICE CODE IN ELECTRICAL SYSTEM [E238] (DISCONNECTION IN ATTACHMENT RETURN SWITCHING RELAY)p. 440
SERVICE CODE IN ELECTRICAL EQUIPMENT [E245] (SHORT-CIRCUITING IN ATTACHMENT OIL FLOW RATE ADJUSTING EPC) (MULTI-MONITOR ONLY)p. 442
SERVICE CODE IN ELECTRICAL EQUIPMENT [E246] (DISCONNECTION IN ATTACHMENT OIL FLOW RATE ADJUSTING EPC) (MULTI-MONITOR ONLY)p. 443
SERVICE CODE IN ELECTRICAL SYSTEM [E256] (INCORRECT NONVOLATILE MEMORY DATA)p. 444
SERVICE CODE IN ELECTRICAL SYSTEM [E304] (SHORT CIRCUIT OF ENGINE STOP SOLENIOD RELAY)p. 445
SERVICE CODE IN ELECTRICAL SYSTEM [E306] (ABNORMALITY IN GOVERNOR POTENTIOMETER)p. 447
SERVICE CODE IN ELECTRICAL SYSTEM [E308] (ABNORMALITY IN FUEL DIAL)p. 449
SERVICE CODE IN ELECTRICAL SYSTEM [E314] (DISCOONECTION OF ENGINE STOP SOLENOID RELAY)p. 451
SERVICE CODE IN ELECTRICAL SYSTEM [E315] (SHORT-CIRCUIT IN BATTERY RELAY)p. 453
SERVICE CODE IN ELECTRICAL SYSTEM [E316] (STEP-OUT IN GOVERNOR MOTOR)p. 455
SERVICE CODE IN ELECTRICAL SYSTEM [E317] (DISCONNECTION IN GOVERNOR MOTOR PHASE A AND PHASE B)p. 456
SERVICE CODE IN ELECTRICAL SYSTEM [E318] (SHORT-CIRCUITING IN GOVERNOR MOTOR PHASE A AND PHASE B)p. 458
FAILURE CODE IN MECHANICAL SYSTEM [A000N1] (OUT-OF RATE ENGINE ROTATION AT HIGH IDLING)p. 460
FAILURE CODE IN MECHANICAL SYSTEM [A000N2] (OUT-OF RATE ENGINE ROTATION AT LOW IDLING)p. 460
FAILURE CODE IN MECHANICAL SYSTEM [AA10NX] (AIR CLEANER CLOGGING)p. 461
FAILURE CODE IN MECHANICAL SYSTEM [AB00KE] (ABNORMALLY LOWERED CHARGING VOLTAGE)p. 462
FAILURE CODE IN MECHANICAL SYSTEM [B@BAZG] (ABNORMALLY LOWERED ENGINE OIL PRESSURE)p. 464
FAILURE CODE IN MECHANICAL SYSTEM [B@BAZK] (ABNORMALLY LOWERED ENGINE OIL LEVEL)p. 465
FAILURE CODE IN MECHANICAL SYSTEM [B@BCNS] (ENGINE COOLING WATER OVERHEATING)p. 466
FAILURE CODE IN MECHANICAL SYSTEM [B@BCZK] (ABNORMALLY LOWERED RADIATOR WATER LEVEL)p. 467
FAILURE CODE IN MECHANICAL SYSTEM [B@HANS] (HYDRAULIC OIL OVERHEATING)p. 468
+TROUBLESHOOTING OF ELECTRICAL SYSTEM (E-MODE)p. 469
INFORMATION CONTAINED IN TROUBLESHOOTING TABLEp. 470
E-1 ENGINE DOES NOT STARTp. 471
E-2 ENGINE STOPS WHILE IN OPERATIONp. 476
E-3 ENGINE SPEED IS IRREGULAR, OR THERE IS HUNTINGp. 477
E-4 ENGINE DOES NOT STOPp. 479
E-5 AUTO-DECELERATOR DOES NOT WORKp. 481
E-6 AUTO ENGINE WARM-UP DEVICE DOES NOT WORKp. 482
E-7 PREHEATER DOES NOT WORKp. 483
E-8 ALL WORK EQUIPMENT, SWING AND TRAVEL DO NOT MOVEp. 485
E-9 ONE-TOUCH POWER-MAX. SWITCH DOES NOT WORKp. 487
E-10 NO DISPLAY IN MONITOR PANEL AT ALLp. 488
E-11 PART OF DISPLAY ON MONITOR PANEL IS MISSINGp. 489
E-12 MONITOR PANEL DISPLAYS CONTENTS IRRELEVANT TO THE MODELp. 489
E-13 FUEL LEVEL MONOTOR RED LAMP LIGHTS UP WHILE ENGINE IS RUNNINGp. 490
E-14 ENGINE COOLING WATER TEMPERATURE GAUGE DOES NOT INDICATE CORRECTLYp. 491
E-15 HYDRAULIC OIL TEMPERATURE GAUGE DOES NOT DISPLAY CORRECTLYp. 492
E-16 FUEL GAUGE DOES NOT DISPLAY CORRECTLYp. 493
E-17 SWING LOCK MONITOR DOES NOT DISPLAY CORRECTLYp. 494
E-18 WHEN THE MONITOR SWITCH IS OPERATED, NO DISPLAY APPEARSp. 495
E-19 WINDSHEILD WIPER DOES NOT WORKp. 497
E-20 ALARMING BUZZER CANNOT BE CANCELLEDp. 499
E-21 "BOOM RAISE" IS NOT CORRECTLY DISPLAYED IN MONITOR FUNCTIONp. 500
E-22 "BOOM LOWER" IS NOT CORRECTLY DISPLAYED IN MONITOR FUNCTIONp. 501
E-23 "ARM DIGGING" IS NOT CORRECTLY DISPLAYED IN MONITOR FUNCTIONp. 502
E-24 "ARM DUMPPING" IS NOT CORRECTLY DISPLAYED IN MONITOR FUNCTIONp. 503
E-25 "BUCKET DIGGING" IS NOT CORRECTLY DISPLAYED IN MONITOR FUNCTIONp. 504
E-26 "BUCKET DUMPING" IS NOT CORRECTLY DISPLAYED IN MONITOR FUNCTIONp. 505
E-27 "SWING" IS NOT CORRECTLY DISPLAYED IN MONITOR FUNCTIONp. 507
E-28 "TRAVEL" IS NOT CORRECTLY DISPLAYED IN MONITOR FUNCTIONp. 509
E-29 "TRAVEL DIFFERENTIAL PRESSURE" IS NOT CORRECTLY DISPLAYED IN MONITOR FUNCTIONp. 511
E-30 "SERVICE" IS NOT CORRECTLY DISPLAYED IN MONITOR FUNCTIONp. 513
E-31 AIR CONDITIONER DOES NOT WORKp. 515
E-32 TRAVEL ALARM DOES NOT SOUNDp. 516
+TROUBLESHOOTING OF HYDRAULIC AND MECHANICAL SYSTEM (H-MODE)p. 517
SYSTEM CHART FOR HYDRAULIC AND MECHANICAL SYSTEMSp. 518
INFORMATION CONTAINED IN TROUBLESHOOTING TABLEp. 520
H-1 ALL WORK EQUIPMENT LACK POWER, OR TRAVEL AND SWING SPEEDS ARE SLOWp. 521
H-2 ENGINE SPEED SHARPLY DROPS OR ENGINE STALLSp. 522
H-3 NO WORK EQUIPMENT, TRAVEL OR SWING MOVEp. 523
H-4 ABNORMAL NOISE IS HEARD FROM AROUND HYDRAULIC PUMPp. 523
H-5 AUTO-DECELERATOR DOES NOT WORKp. 524
H-6 FINE CONTROL MODE DOES NOT FUNCTIONp. 524
H-7 BOOM MOVES SLOWLY OR LACKS POWERp. 525
H-8 ARM MOVES SLOWLY OR LACKS POWERp. 526
H-9 BUCKET MOVES SLOWLY OR LACKS POWERp. 527
H-10 WORK EQUIPMENT DOES NOT MOVEp. 527
H-11 WORK EQUIPMENT HAS A BIT TOO FAST HYDRAULIC DRIFTp. 528
H-12 WORK EQUIPMENT HAS A BIG TIME LAGp. 529
H-13 OTHER WORK EQUIPMENT MOVES WHEN RELIEVING SINGLE CIRCUITp. 529
H-14 ONE-TOUCH POWER MAX, SWITCH DOES NOT OPERATEp. 529
H-15 IN COMPOUND OPERATION, WORK EQUIPMENT WITH LARGER LOAD MOVES SLOWLYp. 530
H-16 IN SWING + BOOM RAISE OPERATION, BOOM MOVES SLOWLYp. 530
H-17 IN SWING + TRAVEL, TRAVEL SPEED DROPS SHARPLYp. 530
H-18 MACHINE SWERVES IN TRAVELp. 531
H-19 MACHINE TRAVEL SLOWLYp. 532
H-20 MACHINE CANNOT BE EASILY STEERED OR LACKS POWERp. 533
H-21 TRAVEL SPEED DOES NOT SHIFT, OR IT IS TOO SLOW OR FASTp. 534
H-22 TRACK SHOE DOES NOT TURN (ONE SIDE ONLY)p. 534
H-23 MACHINE DOES NOT SWINGp. 535
H-24 SWING ACCELERATION IS POOR, OR SWING SPEED IS SLOW)p. 536
H-25 EXCESSIVE OVERRUN WHEN STOPPING SWINGp. 537
H-26 THERE IS BIG SHOCK WHEN STOPPING SWINGp. 538
H-27 THERE IS BIG ABNORMAL NOISE CAUSED WHEN STOPPING SWINGp. 538
H-28 SWING NATURAL DRIFT IS TOO BIGp. 539
+30 DISSASSEMBLY AND ASSEMBLYp. 540
+HOW TO READ MANUALp. 542
REMOVAL AND INSTALLATION OF ASSEMBLIESp. 542
DISASSEMBLY AND ASSEMBLY OF ASSEMBLIESp. 543
PRECAUTIONS WHEN PERFORMING OPERATIONp. 544
SPECIAL TOOL LISTp. 546
+STARTING MOTOR ASSEMBLYp. 549
REMOVALp. 549
INSTALLATIONp. 549
+FUEL INJECTION PUMP ASSEMBLYp. 550
SPECIAL TOOLSp. 550
REMOVALp. 550
INSTALLATIONp. 552
+ENGINE FRONT SEALp. 554
REMOVALp. 554
INSTALLATIONp. 554
+ENGINE REAR SEALp. 555
REMOVALp. 555
INSTALLATIONp. 555
+CYLINDER HEAD ASSEMBLYp. 557
SPECIAL TOOLSp. 557
REMOVALp. 557
INSTALLATIONp. 560
+RADIATOR ASSEMBLYp. 563
REMOVALp. 563
INSTALLATIONp. 564
+HYDRAULIC OIL COOLER ASSEMBLYp. 565
REMOVALp. 565
INSTALLATIONp. 566
+ENGINE AND HYDRAULIC PUMP ASSEMBLIESp. 567
SPECIAL TOOLSp. 567
REMOVALp. 567
INSTALLATIONp. 570
+FINAL DRIVE ASSEMBLYp. 571
REMOVALp. 571
INSTALLATIONp. 571
+DISASSEMBLY AND ASSEMBLYp. 572
SPECIAL TOOLSp. 572
DISASSEMBLYp. 572
ASSEMBLYp. 575
SKETCHES OF SPECIAL TOOLSp. 581
+SWING MOTOR, SWING MACHINERY ASSEMBLYp. 582
REMOVALp. 582
INSTALLATIONp. 582
+DISASSEMBLY AND ASSEMBLYp. 583
SPECIAL TOOLSp. 583
DISASSEMBLYp. 583
ASSEMBLYp. 585
SKETCHES OF SPECIAL TOOLSp. 590
+CARRIER ROLLER ASSEMBLYp. 591
SPECIAL TOOLSp. 591
ASSEMBLYp. 591
+TRACK ROLLER ASSEMBLYp. 592
SPECIAL TOOLSp. 592
ASSEMBLYp. 592
+IDLER ASSEMBLYp. 593
SPECIAL TOOLSp. 593
DISASSEMBLYp. 593
ASSEMBLYp. 594
+RECOIL SPRING ASSEMBLYp. 596
SPECIAL TOOLSp. 596
DISASSEMBLYp. 596
ASSEMBLYp. 597
+SPROCKETp. 598
REMOVALp. 598
INSTALLATIONp. 598
+TRACK SHOE ASSEMBLYp. 599
SPECIAL TOOLSp. 599
EXPANSION OF TRACK SHOEp. 599
ASSEMBLYp. 600
+SWING CIRCLE ASSEMBLYp. 601
REMOVALp. 601
INSTALLATIONp. 601
+REVOLVING FRAME ASSEMBLYp. 602
REMOVALp. 602
INSTALLATIONp. 604
+CENTER SWIVEL JOINT ASSEMBLYp. 605
REMOVALp. 605
INSTALLATIONp. 606
+DISASSEMBLY AND ASSEMBLYp. 607
SPECIAL TOOLSp. 607
DISASSEMBLYp. 607
ASSEMBLYp. 607
+HYDRAULIC TANK ASSEMBLYp. 608
REMOVALp. 608
INSTALLATIONp. 609
+CONTROL VALVE ASSEMBLYp. 610
REMOVALp. 610
INSTALLATIONp. 612
+DISASSEMBLY AND ASSEMBLYp. 613
SPECIAL TOOLSp. 613
ASSEMBLYp. 614
+HYDRAULIC PUMP ASSEMBLYp. 615
SPECIAL TOOLSp. 615
REMOVALp. 615
INSTALLATIONp. 617
+OIL SEAL IN HYDRAULIC PUMP INPUT SHAFTp. 618
REMOVALp. 618
INSTALLATIONp. 618
+WORK EQUIPMENT PPC VALVE ASSEMBLYp. 619
+TRAVEL PPC VALVE ASSEMBLYp. 620
+HYDRAULIC CYLINDER ASSEMBLYp. 621
SPECIAL TOOLSp. 621
DISASSEMBLYp. 621
ASSEMBLYp. 623
+WORK EQUIPMENT ASSEMBLYp. 627
SPECIAL TOOLSp. 627
REMOVALp. 627
INSTALLATIONp. 628
+AIR CONDITIONER UNIT ASSEMBLYp. 630
SPECIAL TOOLSp. 630
REMOVALp. 630
INSTALLATIONp. 632
+COUNTERWEIGHT ASSEMBLYp. 633
REMOVALp. 633
INSTALLATIONp. 633
+OPERATOR'S CAB ASSEMBLYp. 634
REMOVALp. 634
INSTALLATIONp. 635
+MONITOR ASSEMBLYp. 636
REMOVALp. 636
INSTALLATIONp. 636
+GOVERNOR PUMP CONTROLLER ASSEMBLYp. 637
REMOVALp. 637
INSTALLATIONp. 637
+90 OTHERSp. 638
HYDRAULIC DIAGRAMp. 639
ELECTRICAL DIAGRAM (1/4)p. 640
ELECTRICAL DIAGRAM (2/4)p. 641
ELECTRICAL DIAGRAM (3/4)p. 642
ELECTRICAL DIAGRAM (4/4)p. 643
Repair Procedures and Diagnostic Support
The disassembly and assembly chapter is built around workshop jobs. Procedures cover removal and installation of major machine assemblies, along with dedicated disassembly and reassembly instructions where the manual provides them. Special tools, component weights, tightening instructions, oil refilling, air bleeding, sealing and lubrication notes are included around relevant operations. Examples of covered areas include final drives, swing machinery, undercarriage components, center swivel joint, hydraulic tank, control valve, hydraulic pump, cylinders and work equipment.
Testing and adjusting content supports fault diagnosis before parts are removed. Standard-value tables establish reference conditions, while dedicated procedures address engine-related measurements, swing and travel behavior, hydraulic pressures, PPC outputs, pump control pressures, work-equipment drift and electronic monitoring. The troubleshooting material then links machine symptoms and service information to checks of mechanical, hydraulic and electrical causes. This structure is useful when the goal is to confirm the fault first and avoid replacing components without a measured basis.
Get the Correct PC300/350(LC)-7 Service Reference
The Komatsu PC300-7 PC300LC-7 PC350-7 PC350LC-7 Shop Manual SEBM025804 PDF supports a wide range of workshop tasks, from checking service limits and hydraulic pressures to diagnosing control faults, removing assemblies, rebuilding selected components and following specified installation procedures. Having the correct serial-range manual matters because repair decisions depend on the right procedures, tightening information, circuit layouts, clearances, pressures and inspection standards for the machine being serviced.
After payment, the manual is delivered as an instant PDF download with no physical shipping. It can be opened on any compatible device, including phones, tablets and computers, kept available for workshop reference, and printed when a paper copy of selected procedures or diagrams is more convenient.
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