Komatsu PC300LC-6 PC300HD-6 Hydraulic Excavator Shop Manual CEBM002901 PDF

Description

Komatsu PC300LC-6 PC300HD-6 Hydraulic Excavator Shop Manual CEBM002901 – PDF DOWNLOAD

FILE DETAILS:

Komatsu PC300LC-6 PC300HD-6 Hydraulic Excavator Shop Manual CEBM002901 – PDF DOWNLOAD

Language : English
Pages : 490
Downloadable : Yes
File Type : PDF

IMAGES PREVIEW OF THE MANUAL:

TABLE OF CONTENTS:

Komatsu PC300LC-6 PC300HD-6 Hydraulic Excavator Shop Manual CEBM002901 – PDF DOWNLOAD

• SERIAL NUMBERS PC300LC-6 – A83001 and up
• SERIAL NUMBERS PC300HD-6 – A83001 and up

MAIN MENU 0
COVER 1
CONTENTS 2
00 FORWARD 9
SAFETY 10
GENERAL 12
HOW TO READ THE SHOP MANUAL 13
HOISTING INSTRUCTIONS 14
COATING MATERIALS 15
STANDARD TIGHTENING TORQUE 17
ELECTRIC WIRE CODE 21
CONVERSION TABLES 22
METHOD OF USING THE CONVERSION TABLE 22
01 GENERAL 28
SPECIFICATION DRAWINGS 29
SPECIFICATIONS 33
WEIGHT TABLE 35
FUEL COLLANT AND LUBRICANTS 37
10 STRUCTURE AND FUNCTION 44
PARTS RELATED TO ENGINE 45
RADIATOR, OIL COOLER 48
POWER TRAIN 51
FINAL DRIVE 52
SWING CIRCLE 57
SWING MACHINERY 58
TRACK FRAME, RECOIL SPRING 61
TRACK SHOE 64
HYDRAULIC PIPING DRAWING 65
HYDRAULIC CIRCUIT DIAGRAM 67
HYDRAULIC TANK AND FILTER 68
HYDRAULIC PUMP 69
CONTROL VALVE 89
SELF REDUCING PRESURE VALVE 97
SUCTION SAFETY VALVE 102
CLSS 104
SWING MOTOR 147
CENTER SWIVEL JOINT 151
TRAVEL MOTOR 152
VALVE CONTROL 170
WORK EQUIPMENT PPC VALVE 171
TRAVEL PPC VALVE 175
PPC SAFETY LOCK VALVE 181
PPC ACCUMULATOR 182
PPC SHUTTLE VALVE, TRAVEL JUNCTION VALVE 183
LS-EPC VALVE 190
SOLENOID VALVE 193
BOOM HOLDING VALVE 195
WORK EQUIPMENT 198
AIR CONDITIONER 199
ELECTRICAL WIRING SCHEMATIC 200
ELECTRICAL WIRING DIAGRAM 201
ENGINE CONTROL 204
ELECTRONIC CONTROL SYSTEM 211
MACHINE MONITOR CONTROL 234
20 TESTING AND ADJUSTING 244
TESTING AND ADJUSTING 244
STANDARD VALUE TABLE FOR ENGINE 245
STANDARD VALUE TABLE FOR CHASSIS RELATED PARTS 246
STANDARD VALUE TABLE FOR ELECTRICAL PARTS 251
TOOLS FOR TESTING, ADJUSTING AND TROUBLESHOOTING 257
MEASURING ENGINE SPEED 258
INTAKE MAIFOLD PRESSURE 259
INTAKE AIR RESTRICTION 259
LUBRICATING OIL PRESSURE 259
FUEL [FILTER] INLET RESTRICTION 259
BLOW BY PRESSURE 260
ENGINE BACK PRESSURE 260
COOLANT TEMPERATURE 260
VALVE CLEARANCE 260
MEASURING EXHAUST COLOR 261
GOVERNOR MOTOR LEVER STROKE 262
WORK EQUIPMENT, SWING, TRAVEL CIRCUIT 263
TVC VALVE OUTPUT PRESSURE 266
LS VALVE OUTPUT PRESSURE 268
LS DIFFERENTIAL PRESURE 268
CONTROL CIRCUIT OIL PRESSURE 271
SOLENOID VALVE OUTPUT PRESSURE 272
PPC VALVE OUTPUT PRESSURE AND PPC SHUTTLE VALVE 275
WORK EQUIPMENT, SWING PPC VALVE 277
TRAVEL DEVIATION 278
HYDRAULIC DRIFT OF WORK EQUIPMENT 279
MEASURING OIL LEAKAGE 281
RELEASING REMAINING PRESSURE 284
SWING CIRCLE BEARING 285
WEAR OF SPROCKET 286
TRACK SHOE TENSION 287
BLEEDING AIR 288
TROUBLESHOOTING 291
TESTING AND ADJUSTMENT 256
TOOLS FOR TESTIN, ADJUSTING AND TROUBLESHOOTING 257
MEASURING ENGINE SPEED 258
INTAKE MANIFOLD PRESSURE 259
INTAKE AIR RESTRICTION 259
LUBRICATING OIL PRESSURE 259
FUEL [FILTER] INLET RESTRICTION 259
BLOW BY PRESSURE 260
ENGINE BACK PRESSURE 260
COOLANT TEMPERATURE 260
VALVE CLEARANCE 260
MEASURING EXHAUST COLOR 261
GOVERNOR MOTOR LEVER STROKE 262
WORK EQUIPMENT, SWING, TRAVEL CIRCUIT 263
TVC VALVE OUTPUT PRESSURE 266
LS VALVE OUTPUT PRESSURE AN DLS DIFFERENTIAL PRESSURE 268
CONTROL CIRCUIT OIL PRESSURE 271
SOLENOID VALVE OUPUT PRESSURE 272
PPC VALVE OUTPUT PRESSURE AND PPC SHUTTLE VALVE 275
WORK EQUIPMENT, SWING PPC VALVE 277
TRAVEL DEVIATION 278
LOCATIONS CAUSING HYDRAULIC DRIFT OF WORK EQUIPMENT 279
MEASURING OIL LEAKAGE 281
RELEASING REMAINING PRESSURE IN HYDRAULIC CIRCUIT 284
TESTING CLEARANCE OF SWING CIRCLE BEARING 285
WEAR OF SPROCKET 286
TRACK SHOE TENSION 287
BLEEDING AIR 288
TROUBLESHOOTING 291
POINTS TO REMEMBER WHEN TROUBLESHOOTING 292
SEQUENCE OF EVENTS IN TROUBLESHOOTING 293
POINTS TO REMEMBER WHEN CARRYING OUT MAINTENANCE 294
CHECKS BEFORE TROUBLSHOOTING 303
CONNECTOR TYPES AND MOUNTING LOCATIONS 304
CONNECTION TABLE FOR CONNECTOR PIN NUMBERS 307
EXPLANATION OF CONTROL MECHANISM FOR ELECTRICAL SYSTEM 317
DISPLAY METHOD AND SPECIAL FUNCTION OF MONITORING PANEL 318
METHOD OF USING JUDGEMENT TABLE 326
METHOD OF USING TROUBLSHOOTING CHARTS 328
DETAILS OF TROUBLESHOOTING AND TROUBLESHOOTING PROCEDURE 331
SERVICE CODE TABLE 335
TROUBLESHOOTING OF COMMUNICATION ABNORMALITY SYSTEM N MODE 336
N-1 [E218] COMMUNICATION ABNORMALITY 337
TROUBLESHOOTING OF GOVERNOR, PUMP CONTROLLER GOVEROR CONTROL SYSTEM E MODE 339
POINTS TO REMEMBER 340
ACTIONS TAKEN 341
JUDGEMENT TABLE 343
ELECTRICAL CIRCUIT DIAGRAM FOR E MODE SYSTEM 344
E-1 ABNORMAILITY IN GOVERNOR, PUMP CONTROLLER POWER SOURCE, CONTROLLER LED IS OFF 345
E-2 [E308] ABNORMALITY IN FUEL CONTROL DIAL INPUT VALUE IS DISPLAYED 346
E-3 [E317] ABNORMALITY, DISCONNECTION IN MOTOR DRIVE SYSTEM IS DISPLAYED 347
E-4 [E318] ABNORMALITY, SHORT CIRCUIT IN MOTOR DRIVE SYSTEM IS DISPLAYED 348
E-5 [E306] ABNORMALITY IN FEEDBACK POTENTIOMETER SYSTEM IS DISPLAYED 349
E-6 [E315] ABNORMALITY, SHORT CIRCUIT IN BATTERY RELAY OUTPUT SYSTEM IS DISPLAYED 350
E-7 [E316] ABNORMALITY, STEP OUT IN MOTOR DISPLAYED 351
E-8 ENGINE DOES NOT START 352
E-9 ENGINE SPEED IS IRREGULAR 354
E-10 LACK OF OUTPUT, ENGINE HIGH IDLE SPEED IS TO LOW 356
E-11 ENGINE DOES NOT STOP 357
E-12 DEFECTIVE OPERATION OF BATTERY RELAY SYSTEM, ENGINE DOES NOT STOP 358
TROUBLESHOOTING OF ENGINE SYSTEM S MODE 360
METHOD OF USING CHARTS 361
S-1 STARTING PERFORMANCE IS POOR, STARTING ALWAYS TAKES TIME 365
S-2 ENGINE DOES NOT START 366
S-3 ENGINE DOES NOT PICK UP SMOOTHLY, FOLLOW UP IS POOR 369
S-4 ENGINE STOPS DURING OPERATION 370
S-5 ENGINE DOES NOT ROTATE SMOOTHLY, HUNTING 371
S-6 ENGINE LACKS OUTPUT, NO POWER 372
S-7 ENGINE SMOKE IS BLACK, INCOPLETE COMBUSTION 373
S-8 OIL CONSUMPTIONIS EXCESSIVE, OR EXHAUST SMOKE IS BLUE 374
S-9 OIL BECOMES CONTAMINATED QUICKLY 374
S-1O FUEL CONSUMPTION IS EXCESSIVE 374
S-11 OIL IS IN COOLANT, OR COOLANT SPURTS BACK, OR COOLANT LEVEL GOES DOWN 374
S-12 OIL PRESSURE CAUTION LAMP LIGHTS UP, DROP IN OIL PRESSURE 374
S-13 OIL LEVEL RISES; COOLANT, FUEL IN OIL 375
S-14 COOLANT TEMPERATURE BECOMES TOO HIGH; OVERHEATING 376
S-15 ABNORMAL NOISE IS MADE 377
S-16 VIBRATION IS EXCESSIVE 378
TROUBLESHOOTING OF GOVERNOR, PUMP CONTROLLER, PUMP CONTROL SYSTEM C MODE 379
POINTS TO REMEMBER 380
ACTIONS TAKEN BY CONTROLLER 381
JUDGEMENT TABLE 385
ELECTRICAL CIRCUIT DIAGRAM FOR C MODE 386
C-1 ABNORMALITY IN CONTROLLER POWER SOURCE SYSTEM, CONTROLLER LED IS OFF 388
C-2 [E232] SHORT CIRCUIT IN FRONT PUMP TVC SOLENOID SYSTEM IS DISPLAYED 389
C-3 [E233] DISCONNECTION IN FRONT PUMP TVC SOLENOID IS DISPLAYED 390
C-4 [E236] SHORT CIRCUIT IN REAR PUMP TVC SOLENOID SYSTEM IS DISPLAYED 391
C-5 [E237] DISCONNECTION IN REAR PUMP TVC SOLENOID SYSTEM IS DISPLAYED 392
C-6 [E207] SHORT CIRCUIT IN LS SELECT SOLENOID SYSTEM IS DISPLAYED 393
C-7 [E208] DISCONNECTION IN ACTIVE MODE, BOOM, SOLENOID SYSTEM IS DISPLAYED 395
C-8 [E203] SHORT CIRCUIT IN SWING BRAKE SOLENOID SYSTEM IS DISPLAYED 396
C-9 [E213] DISCONNECTION IN SWING BRAKE SOLENOID SYSTEM IS DISPLAYED 397
C-10 [E204] SHORT CIRCUIT IN PUMP MERGE DIVIDER SOLENOID SYSTEM IS DISPLAYED 398
C-11 [E214] DISCONNECTION IN PUMP MERGE DIVIDER SOLENOID SYSTEM IS DISPLAYED 399
C-12 [E206] SHORT CIRCUIT IN TRAVEL SPED SOLENOIDSYSTEM IS DISPLAYED 400
C-13 [E216] DISCONNECTION IN TRAVEL SPEED SELECTOR SOLENOID SYSTEM IS DISPLAYED 401
C-14 [E217] SHORT CIRCUIT IN ACTIVE MODE, SWING, SOLENOID SYSTEM IS DISPLAED 402
C-15 [E235] DISCONNECTION IN ACTIVE MODE, SWING, SOLENOID SYSTEM IS DISPLAYED 403
C-16 [E217] MODEL SELECTION INPUT ERROR IS DISPLAYED 404
C-17 [E222] SHORT CIRCUIT IN LS-EPC SOLENOID SYTEM IS DISPLAYED 406
C-18 [E223] DISCONNECTION IN LS-EPC SOLENOID SYSTEM IS DISPLAYED 407
C-19 [E224] ABNORMALITY IN FRONT PUMP PRESSURE SENSOR SYSTEM IS DISPLAYED 408
C-20 [E225] ABNORMALITY IN REAR PUMP PRESSURE SENSOR SYSTEM IS DISPLAYED 409
C-21 [E226] ABNORMALITY IN PRESSURE SENSOR POWER SOURCE SYSTEM IS DISPLAYED 410
C-22 [E227] ABNORMALITY IN ENGINE SPEED SENSOR SYSTEM IS DISPLAYED 411
C-23 ABNORMALITY IN MACHINE PUSH UP SOLENOID SYSTEM , NO SERVICE CODE DISPLAYED 412
TROUBLESHOOTING OF GOVERNOR, PUMP CONTROLLER, INPUT SIGNAL SYSTEM F MODE 414
ELECTRIC CIRCUIT DIAGRAM FOR F MODE 416
F-1 BIT PATTERN 20-[1] SWING OIL PRESSURE SWITCH DOES NOT LIGHT UP 417
F-2 BIT PATTERN 20-[2] TRAVEL OIL PRESSURE SWITCH DOES NOT LIGHT UP 418
F-3 BIT PATTERN 20-[3] BOOM LOWER OIL PRESSURE SWITCH DOES NOT LIGHT UP 419
F-4 BIT PATTERN 20-[4] BOOM RAISE OIL PRESSURE SWITCH DOES NOT LIGHT UP 420
F-5 BIT PATTERN 20-[5] ARM IN OIL PRESSURE SWITCH DOES NOT LIGHT UP 421
F-6 BIT PATTERN 20-[6] ARM OUT OIL PRESSURE SWITCH DOES NOT LIGHT UP 422
F-7 BIT PATTERN 21-[1] BUCKET CURL OIL PRESSURE SWITCH DOES NOT LIGHT UP 423
F-8 BIT PATTERN 21-[2] BUCKET DUMP OIL PRESSURE SWITCH DOES NOT LIGHT UP 424
F-9 BIT PATTERN 21-[3] SWING LOCK SWITCH DOES NOT LIGHT UP 425
F-10 BIT PATTERN 22-[5] MODE CONNECTION DOES NOT LIGHT UP 426
F-11 BIT PATTERN 22-[6] LEFT KNOB SWITCH DOES NOT LIGHT UP 427
TROUBLESHOOTING OF MACHINE MECHANICAL SYSTEM H MODE 428
PUMP MERGE DIVIDER LOGIC 429
SOLENOID ACTUATION TABLE 429
TABLE OF FAILURE MODES AND CAUSES 430
H-1 SPEEDS OF ALL WORK EQUIPMENT, SWING, TRAVEL ARE SLOW OR LACK POWER 432
H-2 THERE IS EXCESSIVE DROP IN ENGINE SPEED, OR ENGINE STALLS 433
H-3 NO WORK EQUIPMENT, TRAVEL, SWING MOVEMENT 433
H-4 ABNORMAL NOISE GENERATED AROUND PUMP 434
H-5 AUTO DECELERATION DOES NOT WORK, WHEN PPC SHUTTLE VALVE IS CAUSE 434
H-6 FINE CONTROL ABILITY IS POOR OR RESPONSE IS POOR 434
H-7 BOOM IS SLOW OR LACKS POWER 435
H-8 ARM IS SLOW OR LACKS POWER 436
H-9 BUCKET IS SLOW OR LACKS POWER 437
H-10 WORK EQUIPMENT; BOOM, ARM, BUCKET, DOES NOT MOVE, BUT TRAVEL AND SWING ARE NORMAL 438
H-11 EXCESSIVE HYDRAULIC DRIFT, BOOM, ARM, BUCKET 438
H-12 EXCESSIVE TIME LAG, ENGINE AT LOW IDLING 439
H-13 OTHER EQUIPMENT MOVES WHEN SINGLE CIRCUIT IS RELIEVED 439
H-14 IN L/O, F/O MODES, WORK EQUIPMENT SPEED IS FASTER THAN SPECIFIED SPEE 440
H-15 MALFUNCTION OF MACHINE PUSH UP FUNCTION 440
H-16 IN COMPOUND OPERATIONS, WORK EQUIPMENT WITH LARGER LOAD IS SLOW 440
H-17 IN SWING PLUS BOOM RAISE, BOOM RAISE IS SLOW 441
H-18 IN SWING PLUS ARM, ARM IS SLOW 441
H-19 IN SWING PLUS TRAVEL, TRAVEL SPEED DROPS EXCESSIVELY 441
H-20 TRAVEL DEVIATION 442
H-21 TRAVEL SPEED IS LOW 444
H-22 STEERING DOES NOT TURN EASILY OR LACKS POWER 445
H-23 TRAVEL SPEED DOES NOT SWITCH OR IS FASTER THAN SPECIFIED SPEED 446
H-24 TRAVEL DOES NOT MOVE, ONE SIDE ONLY 446
H-25 DOES NOT SWING 447
H-26 SWING ACCELERATION IS POOR OR SWING SPEED IS SLOW 448
H-27 EXCESSIVE OVERRUN WHEN STOPPING SWING 449
H-28 EXCESSIVE SHOCK WHEN STOPPING SWING, ONE DIRECTION ONLY 450
H-29 EXCESSIVE ABNORMAL NOISE WHEN STOPPING SWING 450
H-30 EXCESSIVE HYDRAULIC DRIFT OF SWING 451
H-31 SWING SPEED IS FASTER THAN SPECIFIED SWING SPEED 451
TROUBLESHOOTING OF MACHINE MONITOR SYSTEM M MODE 452
ACTIONS TAKEN BY MONITOR PANEL WHEN ABNORMALITY OCCURS AND PROBLEMS ON MACHINE 452
ELECTRIC CIRCUIT DIAGRAM FOR M MODE 455
M-1 [E101] ABNORMALITY IN ERROR DATA IS DISPLAYED 456
[E101] ERROR IN CLOCK DATA IS DISPLAYED 456
M-2 [E103] SHORT CIRCUIT IN BUZZER OUTPUT OR 24V WIRING HARNESS CONTACKT WITH BUZZERNESS IS DISPLAYED 457
M3 [E104] AIR CLEANER RESTRICTION DETECTED IS DISPLAYED 458
M4 [E106] DROP IN ENGINE OIL HI PRESSURE DETECTED IS DISPLAYED 458
M5 [E108] ENGINE COOLANT TEMPERATURE 1O5 DEGREES CELS DETECTED IS DISPLAYEDIUS 458
M-6 WHEN START SWITCH IS TURNED ON, NO LAMPS ON MONITOR PANEL LIGHT UP FOR THREE SECONDS 459
M-7 WHEN START SWITCH IS TURNED ON, MONITOR PANEL LAMPS ALL STAY ILLUMINATED AND DO NOT GO OUT 461
M-8 WHEN START SWITCH IS TURNED ON, ITEMS ILLUMINATED ON MONITOR PANEL ARE DIFFERENT FROM ACTUAL MACHINE 461
M-9 WHEN START SWITCH IS TURNED ON, ENGINE STOPPED, BASIC CHECK ITEMS FLASH 462
M-10 PREHEATING IS NOT USED, BUT MONITOR PANEL LIGHTS UP 465
M-11 WHEN START SWITCH IS TURNED ON AND ENGINE IS STARTED, BASIC CHECK ITEMS FLASH 466
M-12 WHEN START SWITCH IS TURNED ON, ENG SPEED, CAUTION ITEMS, EMERGENCY ITEMS FLASH BATTERY ENG OIL PRESSURE LAMPS DO NOT 468
M-13 WHEN START SWITCH IS TURNED ON AND ENG IS STARTED, CAUTION ITEMS, EMERGENCY ITEMS FLASH, WHEN THERE IS NO ABNORMALTY IN E 470
M-14 WHEN START SWITCH IS TURNED ON, ENG STOPPED, BUZZER DOES NOT SOUND FOR ONE SECOND, CAUTION ITEMS FLASH BUT DO NOT SOUND 473
M-15 NO ABNORMALITY IS DISPLAYED ON MONITOR PANEL BUT BUZZER SOUNDS 474
M-16 NIGHT LIGHT ON MONITOR PANEL DOES NOT LIGHT UP, LIQUID CRYSTAL DISPLAY IS NORMAL 475
M-17 COOLANT TEMPERATURE GAUGE DOES NOT RISE 476
M-18 COOLANT TEMPERATURE GAUGE DOES NOT GIVE ANY DISPLAY, NO GUAGE LAMPS LIGH UP DURING OPERATION 477
M-19 FUEL LEVEL GUAGE ALWAYS DISPLAYS FULL 478
M-20 FUEL LEVEL GUAGE DOES NOT GIVE DISPLAY 479
M-21 SWING LOCK SWITCH IS TURNED ON, BUT MONITOR PANEL DOES NOT LIGHT 480
M-22 SWING PROLIX SWITCH IS TURNED ON, BUT MONITOR PANEL DOES NOT FLASH 481
M-23 SERVICE METER DOES NOT ADVANCE WHIL ENGINE IS RUNNING 482
M-24 WHEN START SWITCH IS AT OFF AND TIME SWITCH IS PRESSED, TIME AND SERVICE METER ARE NOT DISPLAYED 482
M-25 DEFECTIVE FUEL LEVEL SENSOR SYSTEM 483
M-26 DEFECTIVE COOLANT TEMPERATURE SENSOR SYSTEM 484
M-27 DEFECTIVE ENGINE OIL LEVEL SENSOR SYSTEM 485
M-28 DEFECTIVE COOLANT LEVEL SENSOR SYSTEM 486
M-29 DEFECTIVE HYDRAULIC OIL LEVEL SENSOR SYSTEM 487
M-30 WIPER DOES NOT WORK OR SWITCH IS NOT BEING USED BUT WIPER IS ACTUATED [INCLUDE E112, E113] 488
M-31 WIPER DOES NOT WORK OR SWITCH IS NOT BEING USED BUT WASHER MOTOR IS ACTUATED [INCLUDEE114] 492
30 DISASSEMBLY AND ASSEMBLY 494
METHOD OF USING MANUAL 495
PRECAUTIONS 497
SPECIAL TOOL LIST 500
SKETCHES OF SPECIAL TOOLS 507
ENGINE COMPONENTS 515
GOVERNOR MOTOR 518
OIL COOLER 519
RADIATOR, OIL COOLER 520
ENGINE, MAIN PUMP 522
DAMPER 526
FUEL TANK 527
CENTER SWIVEL JOINT 528
FINAL DRIVE – PC300LC-6 530
FINAL DRIVE – PC300HD-6 541
TRAVEL MOTOR – PC300LC-6 552
TRAVEL MOTOR – PC300HD-6 565
SPROCKET 578
SWING MOTOR 579
SWING MACHINERY 589
REVOLVING FRAME 598
SWING CIRCLE 600
IDLER AND RECOIL SPRING- PC300LC-6 601
IDLER AND RECOIL SPRING – PC300HD-6 602
IDLER – PC300LC-6 603
IDLER – PC300HD-6 606
RECOIL SPRING 610
TRACK ROLLER 612
CARRIER ROLLER 617
TRACK CHAIN 622
HYDRAULIC TANK 623
MAIN PUMP 625
MAIN PUMP OIL SEAL 652
CONTROL VALVE 653
PUMP MERGE DIVIDER VALVE 667
PRESSURE COMPENSATION VALVE 668
FRONT PUMP SERVO VALVE 669
REAR PUMP SERVO VALVE 670
LS-EPC SOLENOID VALVE 671
SOLENOID VALVE 672
WORK EQUIPMENT PPC VALVE 673
TRAVEL PPC VALVE 675
PPC SHUTTLE VALVE 677
BOOM LOCK VALVE 680
BOOM CYLINDER 682
ARM CYLINDER 684
BUCKET CYLINDER 685
HYDRAULIC CYLINDER 687
WORK EQUIPMENT 697
BUCKET 699
ARM 701
BUCKET AND ARM 703
BOOM 705
OPERATORS CAB 707
COUNTERWEIGHT 709
COMPRESSOR 710
CONDENSER 711
RECEIVER TANK 712
AIR CONDITIONER UNIT 713
GOVERNOR, PUMP CONTROLLER 715
MONITOR PANEL 716
CONTROL STAND CASE 717
40 MAINTENANCE STANDARD 719
ENGINE MOUNT 720
SWING MACHINERY 724
SWING CIRCLE 726
FINAL DRIVE – PC300LC-6 728
FINAL DRIVE – PC300HC-6 730
TRACK FRAME AND RECOIL SPRING 732
IDLER – PC300LC-6 734
IDLER – PC300HD-6 736
CARRIER ROLLER 738
TRACK ROLLER – PC300LC-6 740
TRACK ROLLER – PC300HD-6 741
TRACK SHOE 742
HYDRAULIC PUMP 747
CONTROL VALVE 748
SELF REDUCING PRESSURE VALVE 755
SUCTION SAFETY VALVE 756
SWING MOTOR 757
TRAVEL MOTOR – PC300LC-6 758
TRAVEL MOTOR – PC300HD-6 759
WORK EQUIPMENT – SWING PPC VALVE 760
TRAVEL PPC VALVE 761
SERVICE PPC VALVE 762
PPC SHUTTLE VALVE, TRAVEL JUNCTION VALVE 763
LS-EPC VALVE 764
SOLENOID VALVE 765
CENTER SWIVEL JOINT 766
BOOM HOLDING VALVE 767
HYDRAULIC CYLINDER 768
WORK EQUIPMENT 770
DIMENSIONS OF WORK EQUIPMENT 772
90 OTHER 776
FOLDOUT 1 HYDRAULIC SCHEMATIC 776
FOLDOUT 2 ELECTRICAL WIRING SCHEMATIC (2/3) 780
FOLDOUT 3 ELECTRICAL WIRING SHCEMATIC (3/3) 784

DESCRIPTION:

Komatsu PC300LC-6 PC300HD-6 Hydraulic Excavator Shop Manual CEBM002901 – PDF DOWNLOAD

• SERIAL NUMBERS PC300LC-6 – A83001 and up
• SERIAL NUMBERS PC300HD-6 – A83001 and up

GENERAL PRECAUTIONS:
Mistakes in operation are extremely dangerous. Read the OPERATION & MAINTENANCE MANUAL carefully BEFORE operating the machine.
1. Before carrying out any greasing or repairs, read all the precautions given on the decals which are fixed to the machine.
2. When carrying out any operation, always wear safety shoes and helmet. Do not wear loose work clothes, or clothes with buttons missing.
Always wear safety glasses when hitting parts with a hammer.
Always wear safety glasses when grinding parts with a grinder, etc.
3. If welding repairs are needed, always have a trained, experienced welder carry out the work. When carrying out welding work, always wear welding gloves, apron, glasses, cap and other clothes suited for welding work.
4. When carrying out any operation with two or more workers, always agree on the operating procedure before starting. Always inform your fellow workers before starting any step of the operation. Before starting work, hang UNDER REPAIR signs on the controls in the operator’s compartment.
5. Keep all tools in good condition and learn the correct way to use them.
6. Decide a place in the repair workshop to keep tools and removed parts. Always keep the tools and parts in their correct places. Always keep the work area clean and make sure that there is no dirt or oil on the floor. Smoke only in the areas provided for smoking. Never smoke while working.

PREPARATIONS FOR WORK:
7. Before adding oil or making repairs, park the ma- chine on hard, level ground, and block the wheels or tracks to prevent the machine from moving.
8. Before starting work, lower blade, ripper, bucket or
any other work equipment to the ground. If this is not possible, insert the safety pin or use blocks to prevent the work equipment from falling. In addition, be sure to lock all the control levers and hang warning signs on them.
9. When disassembling or assembling, support the machine with blocks, jacks or stands before starting work.
10. Remove all mud and oil from the steps or other places used to get on and off the machine. Always use the handrails, ladders or steps when getting on or off the machine. Never jump on or off the machine. If it is impossible to use the handrails, ladders or steps, use a stand to provide safe footing.
PRECAUTIONS DURING WORK:
11. When removing the oil filler cap, drain plug or hydraulic pressure measuring plugs, loosen them slowly to prevent the oil from spurting out. Before disconnecting or removing components of the oil, water or air circuits, first remove the pressure completely from the circuit.
12. The water and oil in the circuits are hot when the
engine is stopped, so be careful not to get burned. Wait for the oil and water to cool before carrying out any work on the oil or water circuits.
13. Before starting work, remove the leads from the battery. ALWAYS remove the lead from the negative (-) terminal first.

G.B  14/12/24