Trusted Business
Verified & Licensed
Virus Free Files
100% Safe Downloads
Secure Payment
SSL Protected
Instant Delivery
Available Immediately
KOMATSU PC300, 300LC-6 EXCEL SHOP MANUAL SEBM014406 – PDF DOWNLOAD
$31.95
KOMATSU PC300, 300LC-6 EXCEL SHOP MANUAL SEBM014406 – PDF DOWNLOAD
Instant PDF Download
Available immediately
Save to Your Device
Download & keep forever
Antivirus Scanned
100% virus-free
Trusted Worldwide
175,000+ customers
Description
KOMATSU PC300, 300LC-6 EXCEL SHOP MANUAL SEBM014406 – PDF DOWNLOAD
FILE DETAILS:
KOMATSU PC300, 300LC-6 EXCEL SHOP MANUAL SEBM014406 – PDF DOWNLOAD
Language : English
Pages : 602
Downloadable : Yes
File Type : PDF
IMAGES PREVIEW OF THE MANUAL:
TABLE OF CONTENTS:
KOMATSU PC300, 300LC-6 EXCEL SHOP MANUAL SEBM014406 – PDF DOWNLOAD
COVER................................................................................................................................................................ 1 CONTENTS............................................................................................................................................................. 2 01 GENERAL........................................................................................................................................................... 26 SPECIFICATION DRAWINGS........................................................................................................................................... 27 SPECIFICATIONS................................................................................................................................................... 28 WEIGHT TABLE..................................................................................................................................................... 30 FUEL,COOLANT AND LUBRICANTS...................................................................................................................................... 32 10 STRUCTURE AND FUNCTION............................................................................................................................................ 34 PARTS RELATED TO ENGINE.......................................................................................................................................... 35 RADIATOR,OIL COOLER.............................................................................................................................................. 37 ENGINE CONTROL SYSTEM............................................................................................................................................ 38 POWER TRAIN...................................................................................................................................................... 39 FINAL DRIVE...................................................................................................................................................... 40 SWING CIRCLE..................................................................................................................................................... 41 SWING MACHINERY.................................................................................................................................................. 43 TRACK FRAME,RECOIL SPRING........................................................................................................................................ 44 TRACK SHOE....................................................................................................................................................... 45 HYDRAULIC PIPING DRAWING......................................................................................................................................... 46 HYDRAULIC CIRCUIT DIAGRAM........................................................................................................................................ 48 HYDRAULIC TANK,HYDRAULIC FILTER.................................................................................................................................. 49 HYDRAULIC PUMP................................................................................................................................................... 50 CONTROL VALVE.................................................................................................................................................... 67 SELF-REDUCING PRESSURE VALVE..................................................................................................................................... 75 SUCTION SAFETY VALVE............................................................................................................................................. 80 CLSS............................................................................................................................................................. 81 SWING MOTOR......................................................................................................................................................134 CENTER SWIVEL JOINT..............................................................................................................................................138 TRAVEL MOTOR.....................................................................................................................................................140 VALVE CONTROL....................................................................................................................................................149 WORK EQUIPMENT・SWING PPC VALVE...................................................................................................................................150 TRAVEL PPC VALVE.................................................................................................................................................154 SERVICE PPC VALVE................................................................................................................................................158 PPC ACCUMULATOR..................................................................................................................................................161 PPC SHUTTLE VALVE,TRAVEL JUNCTION VALVE..........................................................................................................................162 SOLENOID VALVE...................................................................................................................................................169 BOOM HOLDING VALVE...............................................................................................................................................171 WORK EQUIPMENT...................................................................................................................................................174 AIR CONDITIONER..................................................................................................................................................175 ACTUAL ELECTRIC WIRING DIAGRAM...................................................................................................................................176 ELECTRIC CIRCUIT DIAGRAM.........................................................................................................................................180 ELECTRIC CONTROL SYSTEM..........................................................................................................................................183 MACHINE MONITOR SYSTEM...........................................................................................................................................189 20 TESTING AND ADJUSTING.............................................................................................................................................194 STANDARD VALUE TABLE FOR ENGINE RELATED PARTS....................................................................................................................195 STANDARD VALUE TABLE FOR CHASSIS RELATED PARTS...................................................................................................................196 STANDARD VALUE TABLE FOR ELECTRICAL PARTS........................................................................................................................204 TESTING AND ADJUSTING............................................................................................................................................207 TOOLS FOR TESTING,ADJUSTING,AND TROUBLESHOOTING..............................................................................................................208 MEASURING ENGINE SPEED.......................................................................................................................................209 MEASURING EXHAUST COLOR......................................................................................................................................210 ADJUSTING VALVE CLEARANCE....................................................................................................................................211 MEASURING COMPRESSION PRESSURE...............................................................................................................................212 MEASURING BLOW-BY PRESSURE...................................................................................................................................212 TESTING AND ADJUSTING FUEL INJECTION TIMING..................................................................................................................213 MEASURING ENGINE OIL PRESSURE................................................................................................................................214 TESTING AND ADJUSTING ALTERNATOR BELT TENSION................................................................................................................215 TESTING AND ADJUSTING WATER PUMP BELT TENSION................................................................................................................215 TESTING AND ADJUSTING BELT TENSION FOR AIR CONDITIONER COMPRESSOR............................................................................................216 ADJUSTING ENGINE SPEED SENSOR................................................................................................................................216 MEASURING AIR SUPPLY PRESSURE (BOOST PRESSURE)...............................................................................................................217 ADJUSTING FUEL CONTROL LEVER.................................................................................................................................218 TESTING AND ADJUSTING HYDRAULIC PRESSURE IN WORK EQUIPMENT,SWING,TRAVEL CIRCUIT..............................................................................220 TESTING AND ADJUSTING TVC VALVE OUTPUT PRESSURE (SERVO PISTON INPUT PRESSURE)................................................................................223 TESTING AND ADJUSTING LS VALVE OUTPUT PRESSURE (SERVO PISTON INPUT PRESSURE) AND LS DIFFERENTIAL PRESSURE....................................................225 MEASURING CONTROL CIRCUIT OIL PRESSURE (OIL PRESSURE WHEN SELF-PRESSURE IS REDUCED)..........................................................................228 TESTING SOLENOID VALVE OUTPUT PRESSURE.......................................................................................................................229 MEASURING PPC VALVE OUTPUT PRESSURE AND TESTING PPC SHUTTLE VALVE............................................................................................230 ADJUSTING WORK EQUIPMENT,SWING PPC VALVE.....................................................................................................................232 TESTING TRAVEL DEVIATION.....................................................................................................................................233 TESTING LOCATIONS CAUSING HYDRAULIC DRIFT OF WORK EQUIPMENT..................................................................................................234 MEASURING OIL LEAKAGE........................................................................................................................................236 TESTING CLEARANCE OF SWING CIRCLE BEARING....................................................................................................................239 TESTING WEAR OF SPROCKET.....................................................................................................................................240 TESTING AND ADJUSTING TRACK SHOE TENSION.....................................................................................................................241 BLEEDING AIR.................................................................................................................................................242 TROUBLESHOOTING..................................................................................................................................................244 POINTS TO REMEMBER WHEN TROUBLESHOOTING......................................................................................................................245 SEQUENCE OF EVENTS IN TROUBLESHOOTING........................................................................................................................246 POINTS TO REMEMBER WHEN CARRYING OUT MAINTENANCE.............................................................................................................247 CHECKS BEFORE TROUBLESHOOTING................................................................................................................................255 CONNECTOR TYPES AND MOUNTING LOCATIONS.......................................................................................................................256 CONNECTOR ARRANGEMENT DIAGRAM................................................................................................................................258 CONNECTION TABLE FOR CONNECTOR PIN NUMBERS...................................................................................................................261 METHOD OF USING TROUBLESHOOTING CHARTS.......................................................................................................................271 TROUBLESHOOTING OF ENGINE SYSTEM (S MODE)....................................................................................................................273 METHOD OF USING TROUBLESHOOTING CHARTS...................................................................................................................274 S-1 STARTING PERFORMANCE IS POOR (STARTING ALWAYS TAKES TIME)............................................................................................278 S-2 ENGINE DOES NOT START................................................................................................................................279 (1) ENGINE DOES NOT TURN.............................................................................................................................279 (2) ENGINR TURNS BUT NO EXHAUST SMOKE COMES OUT (FUEL IS NOT BEING INJECTED).........................................................................280 (3) EXHAUST SMOKE COMES OUT BUT ENGINE DOES NOT START (FUEL IS BEING INJECTED).......................................................................281 S-3 ENGINE DOES NOT PICK UP SMOOTHLY (FOLLOW-UP IS POOR).................................................................................................282 S-4 ENGINE STOPS DURING OPERATIONS.......................................................................................................................283 S-5 ENGINE DOES NOT ROTATE SMOOTHLY (HUNTING)............................................................................................................284 S-6 ENGINE LACKS OUTPUT (NO POWER).......................................................................................................................285 S-7 EXHAUST SMOKE IS BLACK (INCOMPLETE COMBUSTION).......................................................................................................286 S-8 OIL CONSUMPTION IS EXCESSIVE (OR EXHAUST SMOKE IS BLUE)..............................................................................................287 S-9 OIL BECOMES CONTAMINATED QUICKLY.....................................................................................................................288 S-10 FUEL CONSUMPTION IS EXCESSIVE.......................................................................................................................289 S-11 OIL IS IN COOLING WATER,OR WATER SPURTS BACK,OR WATER LEVEL GOES DOWN...............................................................................290 S-12 OIL PRESSURE CAUTION LAMP LIGHTS UP (DROP IN OIL PRESSURE)..........................................................................................291 S-13 OIL LEVEL RISES (WATER,FUEL IN OIL )................................................................................................................292 S-14 WATER TEMPERATURE BECOMES TOO HIGH (OVERHEATING)....................................................................................................293 S-15 ABNORMAL NOISE IS MADE..............................................................................................................................294 S-16 VIBRATION IS EXCESSIVE..............................................................................................................................295 TROUBLESHOOTING OF ELECTRICAL SYSTEM (E MODE)................................................................................................................296 JUDGEMENT TABLE FOR ELECTRICAL SYSTEM,MECHANICAL AND HYDRAULIC SYSTEM....................................................................................297 E MODE ELECTRICAL SYSTEM DIAGRAM.........................................................................................................................299 PUMP REGULATOR LED DISPLAY...............................................................................................................................300 E-1 ERROR CODE DISPALY PATTERN [1-1] (SHORT CIRCUIT IN TVC SOLENOID) IS DISPLAYED........................................................................301 E-2 ERROR CODE DISPLAY PATTERN [1-2] (DISCONNECTION IN TVC SOLENOID) IS DISPLAYED........................................................................302 E-3 ERROR CODE DISPLAY PATTERN [2-1] (ABNORMALITY IN MODEL SELECTION) IS DISPLAYED.......................................................................303 E-4 ERROR CODE DISPLAY PATTERN [2-2] (DISCONNECTION IN ENGINE SPEED SENSOR) IS DISPLAYED.................................................................304 E-5 ABNORMALITY IN PUMP TVC CONTROL SYSTEM...............................................................................................................305 a) FUEL CONTROL LEVER IS NOT RETURNED TO STOP POSITION,BUT ENGINE STALLS ENGINE STALLS WHEN SUDDEN LOAD IS APPLIED...................................305 b) NO POWER WHEN FUEL CONTROL LEVER IS AT FULL WORK EQUIPMENT SPEED IS SLOW .........................................................................305 E-6 ABNORMALITY IN PPC OIL PRESSURE LOCK SOLENOID SYSTEM.................................................................................................307 a) IS NOT ACTUATED (SAFETY LOCK IS NOT RELEASED).....................................................................................................307 b) REMAINS ACTUATED (SAFETY LOCK IS NOT APPLIED).....................................................................................................308 E-7 ABNORMALITY IN SWING LOCK SOLENOID SYSTEM............................................................................................................309 a) IS NOT ACTUATED (CANNOT SWING)....................................................................................................................309 b) REMAINS ACTUATED (SWING CANNOT BE LOCKED).........................................................................................................310 E-8 STEERING IS DIFFICULT TO TURN (ABNORMALITY IN MERGE FLOW SOLENOID SYSTERM)[CONDITION IS SAME AS WHEN BOOM RAISE SWITCH IS LEFT ON:REMAINS MERGED]....311 E-9 ABNORMALITY IN TRAVEL SPEED SOLENOID SYSTEM..........................................................................................................314 a) TRAVEL SPEED DOES NOT CHANGE TO HI (TRAVEL SPEED STAYS IN LO).....................................................................................314 b) TRAVEL SPEED DOES NOT CHANGE TO LO (TRAVEL SPEED STAYS IN HI).....................................................................................315 E-10 ABNORMALITY IN ENGINE STARTING SYSTEM (ENGINE DOES NOT START).......................................................................................316 TROUBLESHOOTING OF HYDRAULIC,MECHANICAL SYSTEM (H MODE)......................................................................................................318 TABLE OF FAILURE MODES AND CAUSES .......................................................................................................................319 H-1 SPEEDS OF ALL WORK EQUIPMENT,SWING,TRAVEL ARE SLOW OR LACK POWER.....................................................................................323 H-2 THERE IS EXCESSIVE DROP IN ENGINE SPEED,OR ENGINE STALLS.............................................................................................325 H-3 NO WORK EQUIPMENT,TRAVEL,SWING MOVE..................................................................................................................326 H-4 ABNORMAL NOISE GENERATED (AROUND PUMP)...............................................................................................................326 H-5 FINE CONTROL ABILITY IS POOR OR RESPONSE IS POOR.....................................................................................................327 H-6 BOOM IS SLOW OR LACKS POWER..........................................................................................................................328 H-7 ARM IS SLOW OR LACKS POWER...........................................................................................................................330 H-8 BUCKET IS SLOW OR LACKS POWER........................................................................................................................332 H-9 WORK EQUIPMENT (BOOM,ARM,BUCKET) DOES NOT MOVE (BUT TRAVEL AND SWING ARE NORMAL).....................................................................332 H-10 EXCESSIVE HYDRAULIC DRIFT (BOOM,ARM,BUCKET).........................................................................................................333 H-11 EXCESSIVE TIME LAG (ENGINE AT LOW IDLING)...........................................................................................................334 H-12 OTHER EQUIPMENT MOVES WHEN SINGLE CIRCUIT IS RELIEVED...............................................................................................334 H-13 IN COMPOUND OPERATIONS,WORK EQUIPMENT WITH LARGER LOAD IS SLOW......................................................................................334 H-14 IN SWING + BOOM RAISE,BOOM RAISE IS SLOW............................................................................................................335 H-15 IN SWING + ARM OUT, ARM OUT IS SLOW.................................................................................................................335 H-16 IN SWING + TRAVEL, TRAVEL SPEED DROPS EXCESSIVELY...................................................................................................335 H-17 TRAVEL DEVIATION....................................................................................................................................336 H-18 TRAVEL SPEED IS SLOW................................................................................................................................337 H-19 STEERING DOES NOT TURN EASILY OR LACKS POWER........................................................................................................339 H-20 TRAVEL SPEED DOES NOT SWITCH OR IS FASTER THAN SPECIFIED SPEED......................................................................................341 H-21 TRAVEL DOES NOT MOVE (ONE SIDE ONLY)................................................................................................................341 H-22 DOES NOT SWING......................................................................................................................................342 H-23 SWING ACCELERATION IS POOR OR SWING SPEED IS SLOW...................................................................................................343 H-24 EXCESSIVE OVERRUN WHEN STOPPING SWING...............................................................................................................345 H-25 EXCESSIVE SHOCK WHEN STOPPING SWING (ONE DIRECTION ONLY)............................................................................................346 H-26 EXCESSIVE ABNORMAL NOISE WHEN STOPPING SWING........................................................................................................346 H-27 EXCESSIVE HYDRAULIC DRIFT OF SWING..................................................................................................................347 TROUBLESHOOTING OF MACHINE MONITOR SYSTEM (M MODE)...........................................................................................................348 MONITOR SYSTEM ELECTRICAL CIRCUIT DIAGRAM................................................................................................................349 M-1 WHEN THE STARTING SWITCH IS TURNED ON, NO DISPLAY IS GIVEN (LAMPS DO NOT LIGHT UP FOR 3 SECONDS).....................................................350 M-2 WHEN STARTING SWITCH IS TURNED ON, LAMPS LIGHT UP FOR 3 SECONDS, BUT THEN DO NOT GO OUT..............................................................350 M-3 WHEN STARTING SWITCH IS TURNED ON, SOME LAMPS DO NOT LIGHT UP FOR 3 SECONDS..........................................................................351 a) NO GAUGE LAMPS LIGHT UP (CAUTION LAMPS LIGHT UP)..................................................................................................351 b) SWING LOCK, PREHEATING LAMPS DO NOT LIGHT UP (ALL GAUGE LAMPS LIGHT UP)...........................................................................351 c) CHARGE CAUTION LAMP DOES NOT LIGHT UP.............................................................................................................351 d) ENGINE OIL PRESSURE CAUTION LAMP DOES NOT LIGHT UP................................................................................................351 M-4 WHEN POWER IS TURNED ON (BEFORE ENGINE IS STARTED), CHARGE CAUTION LAMP DOES NOT LIGHT UP............................................................352 M-5 WHEN POWER IS TURNED ON (BEFORE ENGINE IS STARTED), ENGINE OIL PRESSURE CAUTION LAMP DOES NOT LIGHT UP...............................................352 M-6 DURING PREHEATING, PREHEATING PILOT LAMP DOES NOT LIGHT UP...........................................................................................353 M-7 WHEN SWITCH IS OPERATED, SWING LOCK LAMP DOES NOT LIGHT UP ..........................................................................................353 M-8 ENGINE OIL PRESSURE CAUTION LAMP LIGHTS UP WHEN ENGINE IS RUNNING (ENGINE OIL PRESSURE IS NORMAL)....................................................354 M-9 CHARGE CAUTION LAMP LIGHTS UP WHEN ENGINE IS RUNNING.................................................................................................354 M-10 ABNORMALITY IN COOLANT TEMPERATURE GAUGE............................................................................................................355 a) AFTER ENGINE IS STARTED, LEVEL STAYS AT BOTTOM (WHITE RANGE) AND GOES NOT MOVE....................................................................355 b) AFTER ENGINE IS STARTED, LEVEL IMMEDIATELY RISES ENGINE IS NOT OVERHEATING BUT INDICATOR ENTERS RED RANGE.........................................355 c) COOLANT TEMPERATURE GAUGE GOES OUT................................................................................................................355 M-11 ABNORMALITY IN FUEL GAUGE...........................................................................................................................356 a) ALL FUEL GAUGE SEGMENTS GO OUT....................................................................................................................356 b) EVEN WHEN FUEL LEVEL GOES DOWN, FUEL GAUGE CONTINUES TO SHOW FULL.................................................................................356 c) EVEN WHEN TANK IS FILLED, FUEL GAUGE DOES NOT SHOW FULL...........................................................................................356 M-12 DEFECTIVE OPERATION OF ALARM BUZZER.................................................................................................................358 a) BUZZER DOES NOT SOUND.............................................................................................................................358 b) BUZZER CONTINUES TO SOUND AND DOES NOT STOP.......................................................................................................358 M-13 ENGINE IS RUNNING, BUT SERVICE METER DOES NOT MOVE..................................................................................................359 a) CHARGE CAUTION LAMP LIGHTS UP.....................................................................................................................359 b) CHARGE CAUTION LAMP DOES NOT LIGHT UP.............................................................................................................359 M-14 NIGHT LIGHTING DOES NOT LIGHT UP....................................................................................................................360 a) GAUGE LIGHTING DOES NOT LIGHT UP..................................................................................................................360 b) SERVICE METER LIGHTING DOES NOT LIGHT UP (SERVICE METER IS WORKING NORMALLY)......................................................................360 M-15 WIPER DOES NOT MOVE, OR DOES NOT STOP MOVING........................................................................................................361 a) WIPER DOES NOT MOVE WHEN WIPER SWITCH IS TURNED TO ON.............................................................................................361 b) WIPER MOVES EVEN WHEN WIPER SWITCH IS NOT TURNED TO ON............................................................................................361 M-16 HEATER DOES NOT WORK................................................................................................................................363 a) DOES NOT WORK AT EITHER HI OR LO..................................................................................................................363 b) DOES NOT WORK AT LO ONLY..........................................................................................................................363 c) DOES NOT WORK AT HI ONLY..........................................................................................................................363 30 DISASSEMBLY AND ASSEMBLY..........................................................................................................................................364 METHOD OF USING MANUAL...........................................................................................................................................366 PRECAUTIONS WHEN CARRYING OUT OPERATION..........................................................................................................................368 SPECIAL TOOL LIST................................................................................................................................................370 SKETCHES OF SPECIAL TOOLS........................................................................................................................................374 STARTING MOTOR ASSEMBLY..........................................................................................................................................376 REMOVAL AND INSTALLATION.....................................................................................................................................376 ALTERNATIOR ASSEMBLY ............................................................................................................................................377 REMOVAL AND INSTALLATION ....................................................................................................................................377 ENGINE OIL COOLER ASSEMBLY ......................................................................................................................................378 REMOVAL AND INSTALLATION ....................................................................................................................................378 FUEL INJECTION PUMP ASSEMBLY.....................................................................................................................................379 REMOVAL......................................................................................................................................................379 INSTALLATION ................................................................................................................................................380 WATER PUMP ASSEMBLY..............................................................................................................................................381 REMOVAL AND INSTALLATION ....................................................................................................................................381 NOZZLE HOLDER ASSEMBLY...........................................................................................................................................382 REMOVAL AND INSTALLATION ....................................................................................................................................382 TURBOCHARGER ASSEMBLY............................................................................................................................................383 REMOVAL AND INSTALLATION ....................................................................................................................................383 THERMOSTAT ASSEMBLY .............................................................................................................................................384 REMOVAL AND INSTALLATION.....................................................................................................................................384 ENGINE FRONT SEAL................................................................................................................................................385 REMOVAL......................................................................................................................................................385 INSTALLATION OF .............................................................................................................................................386 ENGINE REAR SEAL.................................................................................................................................................387 REMOVAL AND INSTALLATION ....................................................................................................................................387 CYLINDER HEAD ASSEMBLY ..........................................................................................................................................389 REMOVAL .....................................................................................................................................................389 INSTALLATION.................................................................................................................................................391 AFTERCOOLER ASSEMBLY ............................................................................................................................................394 REMOVAL AND INSTALLATION ....................................................................................................................................394 HYDRAULIC COOLER ASSEMBLY........................................................................................................................................395 REMOVAL AND INSTALLATION ....................................................................................................................................395 RADIATOR, HYDRAULIC COOLER ASSEMBLY..............................................................................................................................396 REMOVAL .....................................................................................................................................................396 INSTALLATION ................................................................................................................................................397 ENGINE, MAIN PUMP ASSEMBLY ......................................................................................................................................398 REMOVAL .....................................................................................................................................................398 INSTALLATION.................................................................................................................................................401 DAMPER ASSEMBLY..................................................................................................................................................402 REMOVAL AND INSTALLATION ....................................................................................................................................402 FUEL TANK ASSEMBLY...............................................................................................................................................403 REMOVAL AND INSTALLATION ....................................................................................................................................403 CENTER SWIVEL JOINT ASSEMBLY.....................................................................................................................................404 REMOVAL AND INSTALLATION.....................................................................................................................................404 DISASSEMBLY AND ASSEMBLY.....................................................................................................................................406 FINAL DRIVE ASSEMBLY.............................................................................................................................................408 REMOVAL AND INSTALLATION.....................................................................................................................................408 DISASSEMBLY..................................................................................................................................................409 ASSEMBLY.....................................................................................................................................................413 TRAVEL MOTOR ASSEMBLY............................................................................................................................................419 DISASSEMBLY..................................................................................................................................................419 ASSEMBLY.....................................................................................................................................................424 SPROCKET.........................................................................................................................................................433 REMOVAL AND INSTALLATION.....................................................................................................................................433 SWING MOTOR ASSEMBLY.............................................................................................................................................434 REMOVAL AND INSTALLATION.....................................................................................................................................434 SWING MACHINERY ASSEMBLY.........................................................................................................................................435 REMOVAL AND INSTALLATION.....................................................................................................................................435 DISASSEMBLY..................................................................................................................................................436 ASSEMBLY.....................................................................................................................................................440 REVOLVING FRAME ASSEMBLY.........................................................................................................................................445 REMOVAL......................................................................................................................................................445 INSTALLATION.................................................................................................................................................446 SWING CIRCLE ASSEMBLY............................................................................................................................................447 REMOVAL AND INSTALLATION.....................................................................................................................................447 IDLER, RECOIL SPRING ASSEMBLY....................................................................................................................................448 REMOVAL AND INSTALLATION.....................................................................................................................................448 IDLER ASSEMBLY...................................................................................................................................................449 DISASSEMBLY..................................................................................................................................................449 ASSEMBLY.....................................................................................................................................................450 RECOIL SPRING ASSEMBLY...........................................................................................................................................452 DISASSEMBLY..................................................................................................................................................452 ASSEMBLY.....................................................................................................................................................453 TRACK ROLLER ASSEMBLY............................................................................................................................................454 REMOVAL AND INSTALLATION.....................................................................................................................................454 DISASSEMBLY..................................................................................................................................................455 ASSEMBLY.....................................................................................................................................................456 CARRIER ROLLER ASSEMBLY..........................................................................................................................................458 REMOVAL AND INSTALLATION.....................................................................................................................................458 DISASSEMBLY..................................................................................................................................................459 ASSEMBLY.....................................................................................................................................................461 TRACK SHOE ASSEMBLY..............................................................................................................................................463 REMOVAL AND INSTALLATION.....................................................................................................................................463 HYDRAULIC TANK ASSEMBLY..........................................................................................................................................464 REMOVAL......................................................................................................................................................464 INSTALLATION.................................................................................................................................................465 MAIN PUMP ASSEMBLY...............................................................................................................................................466 REMOVAL......................................................................................................................................................466 INSTALLATION.................................................................................................................................................468 DISASSEMBLY..................................................................................................................................................469 ASSEMBLY.....................................................................................................................................................475 MAIN PUMP INPUT SHAFT OIL SEAL...................................................................................................................................489 REMOVAL AND INSTALLATION.....................................................................................................................................489 CONTROL VALVE ASSEMBLY...........................................................................................................................................490 REMOVAL......................................................................................................................................................490 INSTALLATION.................................................................................................................................................492 DISASSEMBLY..................................................................................................................................................493 ASSEMBLY.....................................................................................................................................................499 PUMP MERGE/DIVIDER VALVE ASSEMBLY................................................................................................................................506 DISASSEMBLY AND ASSEMBLY.....................................................................................................................................506 PRESSURE COMPENSATION VALVE ASSEMBLY.............................................................................................................................507 DISASSEMBLY AND ASSEMBLY.....................................................................................................................................507 SERVO VALVE ASSEMBLY FOR FRONT PUMP..............................................................................................................................508 REMOVAL AND INSTALLATION.....................................................................................................................................508 SERVO VALVE ASSEMBLY FOR REAR PUMP...............................................................................................................................509 REMOVAL AND INSTALLATION.....................................................................................................................................509 SOLENOID VALVE ASSEMBLY..........................................................................................................................................510 REMOVAL AND INSTALLATION.....................................................................................................................................510 WORK EQUIPMENT PPC VALVE ASSEMBLY................................................................................................................................511 REMOVAL AND INSTALLATION.....................................................................................................................................511 DISASSEMBLY..................................................................................................................................................512 ASSEMBLY.....................................................................................................................................................513 TRAVEL PPC VALVE ASSEMBLY........................................................................................................................................514 REMOVAL AND INSTALLATION.....................................................................................................................................514 DISASSEMBLY..................................................................................................................................................515 ASSEMBLY.....................................................................................................................................................516 PPC SHUTTLE VALVE ASSEMBLY.......................................................................................................................................517 REMOVAL......................................................................................................................................................517 INSTALLATION.................................................................................................................................................518 DISASSEMBLY..................................................................................................................................................519 ASSEMBLY.....................................................................................................................................................520 BOOM LOCK VALVE ASSEMBLY.........................................................................................................................................521 REMOVAL AND INSTALLATION.....................................................................................................................................521 DISASSEMBLY AND ASSEMBLY.....................................................................................................................................522 BOOM CYLINDER ASSEMBLY...........................................................................................................................................523 REMOVAL......................................................................................................................................................523 INSTALLATION.................................................................................................................................................524 ARM CYLINDER ASSEMBLY............................................................................................................................................525 REMOVAL......................................................................................................................................................525 INSTALLATION.................................................................................................................................................526 BUCKET CYLINDER ASSEMBLY.........................................................................................................................................527 REMOVAL......................................................................................................................................................527 INSTALLATION.................................................................................................................................................528 HYDRAULIC CYLINDER ASSEMBLY......................................................................................................................................529 DISASSEMBLY..................................................................................................................................................529 ASSEMBLY.....................................................................................................................................................532 WORK EQUIPMENT ASSEMBLY..........................................................................................................................................536 REMOVAL......................................................................................................................................................536 INSTALLATION.................................................................................................................................................537 BUCKET ASSEMBLY..................................................................................................................................................538 REMOVAL......................................................................................................................................................538 INSTALLATION.................................................................................................................................................539 ARM ASSEMBLY.....................................................................................................................................................540 REMOVAL......................................................................................................................................................540 INSTALLATION.................................................................................................................................................541 BUCKET, ARM ASSEMBLY.............................................................................................................................................542 REMOVAL......................................................................................................................................................542 INSTALLATION.................................................................................................................................................543 BOOM ASSEMBLY....................................................................................................................................................544 REMOVAL......................................................................................................................................................544 INSTALLATION.................................................................................................................................................545 OPERATOR'S CAB ASSEMBLY..........................................................................................................................................546 REMOVAL......................................................................................................................................................546 INATALLATION.................................................................................................................................................547 MONITOR PANEL ASSEMBLY...........................................................................................................................................548 REMOVAL AND INSATALLATION....................................................................................................................................548 COUNTERWEIGHT ASSEMBLY...........................................................................................................................................549 REMOVAL AND INSTALLATION.....................................................................................................................................549 AIR CONDITIONER COMPRESSOR ASSEMBLY..............................................................................................................................550 REMOVAL AND INSTALLATION ....................................................................................................................................550 AIR CONDITIONER CONDENSER ASSEMBLY...............................................................................................................................551 REMOVAL AND INSTALLATION ....................................................................................................................................551 RECEIVER TANK ASSEMBLY...........................................................................................................................................552 REMOVAL AND INSTALLATION ....................................................................................................................................552 AIR CONDITIONER UNIT ASSEMBLY....................................................................................................................................553 REMOVAL......................................................................................................................................................553 INSTALLATION.................................................................................................................................................554 40 MAINTENANCE STANDARD..............................................................................................................................................555 ENGINE MOUNT.....................................................................................................................................................556 SWING MACHINERY..................................................................................................................................................557 SWING CIRCLE.....................................................................................................................................................559 FINAL DRIVE......................................................................................................................................................561 TRACK FRAME AND RECOIL SPRING....................................................................................................................................563 IDLER............................................................................................................................................................564 CARRIER ROLLER...................................................................................................................................................566 TRACK ROLLER.....................................................................................................................................................567 TRACK SHOE.......................................................................................................................................................568 HYDRAULIC PUMP...................................................................................................................................................572 CONTROL VALVE....................................................................................................................................................573 SELF-REDUCING PRESSURE VALVE.....................................................................................................................................580 SUCTION-SAFETY VALVE.............................................................................................................................................581 SWING MOTOR......................................................................................................................................................582 TRAVEL MOTOR.....................................................................................................................................................583 WORK EQUIPMENT・SWING PPC VALVE...................................................................................................................................584 TRAVEL PPC VALVE.................................................................................................................................................585 SERVICE PPC VALVE................................................................................................................................................586 PPC SHUTTLE VALVE, TRAVEL JUNCTION VALVE.........................................................................................................................587 SOLENOID VALVE...................................................................................................................................................588 CENTER SWIVEL JOINT..............................................................................................................................................589 BOOM HOLDING VALVE...............................................................................................................................................591 HYDRAULIC CYLINDER...............................................................................................................................................592 WORK EQUIPMENT...................................................................................................................................................594 DIMENSIONS OF WORK EQUIPMENT.....................................................................................................................................596 90 OTHERS............................................................................................................................................................599 HYDRAULIC CIRCUIT DIAGRAM........................................................................................................................................600 ELECTRIC CIRCUIT DIAGRAM (1/2)...................................................................................................................................601 ELECTRIC CIRCUIT DIAGRAM (2/2)...................................................................................................................................602
DESCRIPTION:
KOMATSU PC300, 300LC-6 EXCEL SHOP MANUAL SEBM014406 – PDF DOWNLOAD
GENERAL
This shop manual has been prepared as an aid to improve the quality of repairs by giving the serviceman an accurate understanding of the product and by showing him the correct way to perform repairs and make judgements. Make sure you understand the contents of this manual and use it to full effect at every opportunity.
This shop manual mainly contains the necessary technical information for operations performed in a service workshop. For ease of understanding. the manual is divided into the following chapters: these chapters are further divided into the each main group of components.
STRUCTURE AND FUNCTION
This section explains the structure and function of each component. It serves not only to give an understanding of the structure, but also serves as reference material for troubleshooting.
TESTING AND ADJUSTING
This section explains checks to be made before and after performing repairs. as well as adjustments to be made at completion of the checks and repairs. Troubleshooting charts correlating ‘Problems” to ‘Causes‘ are also included in this section.
DISASSEMBLY AND ASSEMBLY
This section explains the order to be followed when removing, installing. disassembling or assembling each component, as well as precautions to be taken for these operations.
MAINTENANCE STANDARD
This section gives the judgement standards when inspecting disassembled parts.
S.S 25/12/24
