This Complete Service Repair Workshop Manual PDF Download for the PC400-7, PC400LC-7, PC450-7, PC450LC-7 Komatsu Hydraulic Excavator has easy to read text sections with top quality diagrams, pictures and illustrations. The step by step instructions show you how to fault find or complete any repair or overhaul, correctly and efficiently, saving time and avoiding costly mistakes. All specifications and tolerances are listed. Functions of components and systems are also explained.
APPLICABLE MODELS :
Komatsu PC400-7 - S/N: 50001 and up Komatsu PC400LC-7 - S/N: 50001 and up Komatsu PC450-7 - S/N: 20001 and up Komatsu PC450LC-7 - S/N: 20001 and up
TABLE OF CONTENTS :
- GENERAL - STRUCTURE, FUNCTION - MAINTENANCE STANDARD - TESTING, ADJUSTING - DISASSEMBLY AND ASSEMBLY - OTHER
MANUAL SPECIFICATION :
File Format : PDF Language : English Printable : Yes Searchable : Yes Bookmarked : Yes Product Code : SEBM033007 Total Pages : 782
This 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 is a must for the Do-It-Yourselfer! Saving Yourself $$$$$$ In Service Repair And Maintenance Costs !!!!
This manual PDF download contains specs, diagrams, actual real photo illustrations, and schemes. In addition to space savings, nice thing about having PDF files instead of a hard-printed manual is that you can use the Search feature in Acrobat to find just what your looking for and just print out the exact pages you need or all manual.
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CONTENTS
01 GENERAL SPECIFICATION DRAWINGS SPECIFICATIONS WEIGHT TABLE FUEL, COOLANT AND LUBRICANTS
10 STRUCTURE, FUNCTION AND MAINTENANCE STANDARD ENGINE RELATED PARTS RADIATOR・OIL COOLER・AFTERCOOLER POWER TRAIN FINAL DRIVE SPROCKET SWING MACHINERY SWING CIRCLE TRACK FRAME AND RECOIL SPRING IDLER CARRIER ROLLER TRACK ROLLER TRACK SHOE HYDRAULIC PIPING DRAWING HYDRAULIC TANK HYDRAULIC PUMP LS(PC)-EPC VALVE VARIABLE VOLUME VALVE CONTROL VALVE MAIN RELIEF VALVE CLSS SELF PRESSURE REDUCING VALVE SWING MOTOR REVERSAL PREVENTION VALVE CENTER SWIVEL JOINT TRAVEL MOTOR TRAVEL JUNCTION VALVE VALVE CONTROL TRAVEL PPC SHUTTLE VALVE WORK EQUIPMENT・SWING PPC VALVE TRAVEL PPC VALVE SERVICE PPC VALVE SOLENOID VALVE PPC ACCUMULATOR RETURN OIL FILTER BOOM HYDRAULIC DRIFT PREVENTION VALVE ARM HYDRAULIC DRIFT PREVENTION VALVE QUICK RETURN VALVE LIFT CHECK VALVE ATTACHMENT CIRCUIT SELECTOR VALVE HOLDING VALVE HYDRAULIC CYLINDER WORK EQUIPMENT AIR CONDITIONER ENGINE CONTROL ELECTRONIC CONTROL SYSTEM MONITOR SYSTEM 7-SEGMENT MONITOR SYSTEM SENSOR
20 TESTING AND ADJUSTING STANDARD VALUE TABLE FOR ENGINE STANDARD VALUE TABLE FOR CHASSIS TESTING AND ADJUSTING TESTING, ADJUSTING, AND TROUBLESHOOTING TOOLS TABLE MEASURING ENGINE SPEED MEASURING INTAKE AIR PRESSURE (BOOST PRESSURE) MEASURING EXHAUST TEMPERATURE MEASURING EXHAUST GAS COLOR ADJUSTING VALVE CLEARANCE MEASURING COMPRESSION PRESSURE MEASURING BLOW-BY PRESSURE MEASURING ENGINE OIL PRESSURE HANDLING OF FUEL SYSTEM DEVICES RELEASING RESIDUAL PRESSURE FROM FUEL SYSTEM MEASURING FUEL PRESSURE BLEEDING AIR FROM FUEL CIRCUIT INSPECTION OF FUEL CIRCUIT FOR LEAKAGE ADJUSTING ENGINE SPEED SENSOR TESTING AND ADJUSTING FAN BELT AND ALTERNATOR BELT TENSION TESTING AND ADJUSTING AIR CONDITIONER COMPRESSOR BELT TENSION MEASURING CLEARANCE OF SWING CIRCLE BEARING TESTING AND ADJUSTING TRACK SHOE TENSION TESTING AND ADJUSTING OIL PRESSURE IN WORK EQUIPMENT, SWING, AND TRAVEL CIRCUITS MEASURING BASIC PRESSURE IN CONTROL CIRCUIT TESTING AND ADJUSTING OIL PRESSURE IN PUMP PC CONTROL CIRCUIT TESTING AND ADJUSTING OIL PRESSURE IN PUMP LS CONTROL CIRCUIT MEASURING SOLENOID VALVE OUTPUT PRESSURE MEASURING PPC VALVE OUTPUT PRESSURE ADJUSTING PLAY OF WORK EQUIPMENT AND SWING PPC VALVES TESTING PARTS WHICH CAUSE HYDRAULIC DRIFT OF WORK EQUIPMENT RELEASING RESIDUAL PRESSURE IN HYDRAULIC CIRCUIT MEASURING OIL LEAKAGE BLEEDING AIR FROM EACH PART TESTING PROCEDURE OF DIODE SPECIAL FUNCTIONS OF MONITOR PANEL SPECIAL FUNCTIONS OF 7-SEGMENTS MONITOR PANEL HANDLING OF HIGH-VOLTAGE CIRCUIT OF ENGINE CONTROLLER PREPARATION WORK FOR TROUBLESHOOTING FOR ELECTRICAL EQUIPMENT SYSTEM PM-CLINIC SERVICE TROUBLESHOOTING POINTS TO REMEMBER WHEN TROUBLESHOOTING SEQUENCE OF EVENTS IN TROUBLESHOOTING POINTS TO REMEMBER WHEN CARRYING OUT MAINTENANCE CHECKS BEFORE TROUBLESHOOTING CLASSIFICATION AND STEPS FOR TROUBLESHOOTING CONNECTOR ARRANGEMENT DIAGRAM AND ELECTRIC CIRCUIT DIAGRAM OF EACH SYSTEM CONNECTION TABLE FOR CONNECTOR PIN NUMBERS T-BRANCH BOX AND T-BRANCH TABLE TROUBLESHOOTING WHEN ERROR CODE "ELECTRICAL SYSTEM" AND FAILURE CODE "MECHANICAL SYSTEM" ARE DISPLAYED INFORMATION CONTAINED IN TROUBLESHOOTING TABLE ERROR CODE IN ELECTRICAL SYSTEM [E112](SHORT-CIRCUITING IN NORMAL ROTATION SYSTEM OF WINDSHIELD WIPER MOTOR DRIVE) ERROR CODE IN ELECTRICAL SYSTEM [E113](SHORT-CIRCUITING IN REVERSE ROTATION SYSTEM OF WINDSHIELD WIPER MOTOR DRIVE) ERROR CODE IN ELECTRICAL SYSTEM [E114](SHORT-CIRCUITING IN WINDOW WASHER DRIVE SYSTEM) ERROR CODE IN ELECTRICAL SYSTEM [E115](ABNORMAL WINDSHIELD WIPER MOTION) ERROR CODE IN ELECTRICAL SYSTEM [E116](ABNORMALITY IN RETRACTING WINDSHIELD WIPER) ERROR CODE IN ELECTRICAL SYSTEM (E117](ENG. CONTROLLER S-NET COMM. ERR.) ERROR CODE IN ELECTRICAL SYSTEM (E118](PUMP CONTROLLER S-NET COMM. ERR.) ERROR CODE IN ELECTRICAL SYSTEM (E128](MONITOR COMM. ABNORMALITY) ERROR CODE IN ELECTRICAL SYSTEM (E201](SHORT-CIRCUITING IN TRAVEL INTERLOCKING SOLENOID) ERROR CODE IN ELECTRICAL SYSTEM [E203](SHORT-CIRCUITING IN SWING HOLDING BRAKE SOLENOID) ERROR CODE IN ELECTRICAL SYSTEM [E204](SHORT-CIRCUITING IN MERGE/DIVIDE SOLENOID) ERROR CODE IN ELECTRICAL SYSTEM [E205](SHORT-CIRCUITING IN 2-STAGE RELIEF SOLENOID) ERROR CODE IN ELECTRICAL SYSTEM [E206](SHORT-CIRCUITING IN TRAVEL SPEED SHIFTING SOLENOID) ERROR CODE IN ELECTRICAL SYSTEM [E211](DISCONNECTION IN TRAVEL INTERLOCKING SOLENOID) ERROR CODE IN ELECTRICAL SYSTEM [E213](DISCONNECTION IN SWING HOLDING BRAKE SOLENOID) ERROR CODE IN ELECTRICAL SYSTEM [E214](DISCONNECTION OF MERGE/DIVIDE SOLENOID) ERROR CODE IN ELECTRICAL SYSTEM [E215](DISCONNECTION IN 2-STAGE RELIEF SOLENOID) ERROR CODE IN ELECTRICAL SYSTEM [E216](DISCONNECTION IN TRAVEL SPEED SHIFTING SOLENOID) ERROR CODE IN ELECTRICAL SYSTEM [E217](ABNORMAL INPUT MODEL CODE) ERROR CODE IN ELECTRICAL SYSTEM [E218](S-NET COMM. DISC.) ERROR CODE IN ELECTRICAL SYSTEM [E222](SHORT-CIRCUITING IN LS-EPC SOLENOID) ERROR CODE IN ELECTRICAL SYSTEM [E223](DISCONNECTION IN LS-EPC SOLENOID SYSTEM) ERROR CODE IN ELECTRICAL SYSTEM [E224](F PUMP P. SENSOR ABNORMALITY) ERROR CODE IN ELECTRICAL SYSTEM [E225](R PUMP P. SENSOR ABNORMALITY) ERROR CODE IN ELECTRICAL SYSTEM [E226](P. SENSOR POWER ABNORMALITY) ERROR CODE IN ELECTRICAL SYSTEM [E227](ABNORMALITY IN ENGINE ROTATION SENSOR) ERROR CODE IN ELECTRICAL SYSTEM [E228](SHORT-CIRCUITING IN ATTACHMENT RETURN SWITCHING RELAY) ERROR CODE IN ELECTRICAL SYSTEM [E232](SHORT-CIRCUITING IN PC-EPC SOLENOID) ERROR CODE IN ELECTRICAL SYSTEM [E233](DISCONNECTION IN PC-EPC SOLENOID SYSTEM) ERROR CODE IN ELECTRICAL SYSTEM [E238](DISCONNECTION IN ATTACHMENT RETURN SWITCHING RELAY) ERROR CODE IN ELECTRICAL SYSTEM [E245](SHORT-CIRCUITING IN ATTACHMENT OIL FLOW RATE ADJUSTING EPC) ERROR CODE IN ELECTRICAL SYSTEM [E246](DISCONNECTION IN ATTACHMENT OIL FLOW RATE ADJUSTING EPC) ERROR CODE IN ELECTRICAL SYSTEM [E247](ARM IN PPC PRESSURE SENSOR ABNORMALITY) ERROR CODE IN ELECTRICAL SYSTEM [E248](BUCKET CURL PPC PRESSURE SENSOR ABNORMALITY) ERROR CODE IN ELECTRICAL SYSTEM [E257](PUMP ABNORMALITY) ERROR CODE IN ELECTRICAL SYSTEM [E315](BATTERY RELAY DRIVE S/C) ERROR CODE IN ELECTRICAL SYSTEM [E91B](ENGINE NE SENSOR PROBLEM) ERROR CODE IN ELECTRICAL SYSTEM [E91C](ENGINE G SENSOR PROBLEM) ERROR CODE IN ELECTRICAL SYSTEM [E920](ENGINE TYPE SELECTION ERROR) ERROR CODE IN ELECTRICAL SYSTEM [E921](ENGINE TYPE MISMATCH) ERROR CODE IN ELECTRICAL SYSTEM [E931](FUEL DIAL SYS. ERROR) ERROR CODE IN ELECTRICAL SYSTEM [E934](ENGINE COOLANT SENSOR HI ERROR) ERROR CODE IN ELECTRICAL SYSTEM [E936](ENGINE OIL PRESS. SW. ERROR) ERROR CODE IN ELECTRICAL SYSTEM [E93C](ENGINE BOOST SENSOR ERROR) ERROR CODE IN ELECTRICAL SYSTEM [E93D](ENGINE FUEL TEMP. SENSOR ERROR) ERROR CODE IN ELECTRICAL SYSTEM [E953](ENGINE COMM. ABNORMALITY) ERROR CODE IN ELECTRICAL SYSTEM [E954](SHORT ENGINE STARTER SW.) ERROR CODE IN ELECTRICAL SYSTEM [E955](ENGINE S-NET ERROR) ERROR CODE IN ELECTRICAL SYSTEM [E956](ENGINE POWER FAILURE (1)) ERROR CODE IN ELECTRICAL SYSTEM [E957](ENGINE POWER FAILURE (2)) ERROR CODE IN ELECTRICAL SYSTEM [E95A](ENGINE Q-ADJ. SW. SIGNAL ERROR) ERROR CODE IN ELECTRICAL SYSTEM [E96A](ENGINE COOLANT SENSOR LO ERROR) ERROR CODE IN ELECTRICAL SYSTEM [E970](PCV1 OVER CURRENT) ERROR CODE IN ELECTRICAL SYSTEM [E971](PCV2 OVER CURRENT) ERROR CODE IN ELECTRICAL SYSTEM [E974](PCV1 LINE CUT) ERROR CODE IN ELECTRICAL SYSTEM [E975](PCV2 LINE CUT) ERROR CODE IN ELECTRICAL SYSTEM [E977](RAIL PRESS. SENSOR ERROR) ERROR CODE IN ELECTRICAL SYSTEM [E979](RAIL PRESS. HIGH) ERROR CODE IN ELECTRICAL SYSTEM [E97A](RAIL PRESS. ABNORMAL) ERROR CODE IN ELECTRICAL SYSTEM [E97B](RAIL PRESS. LOW) ERROR CODE IN ELECTRICAL SYSTEM [E97C](RAIL PRESS. TOO LOW) ERROR CODE IN ELECTRICAL SYSTEM [E97D](RAIL PRESS. CUT OF CONTROL) ERROR CODE IN ELECTRICAL SYSTEM [E980](ENG. CONTROLLER ABNORMALITY) ERROR CODE IN ELECTRICAL SYSTEM [E981](FUEL INJECTOR 1 DISC.) ERROR CODE IN ELECTRICAL SYSTEM [E982](FUEL INJECTOR 2 DISC.) ERROR CODE IN ELECTRICAL SYSTEM [E983](FUEL INJECTOR 3 DISC.) ERROR CODE IN ELECTRICAL SYSTEM [E984](FUEL INJECTOR 4 DISC.) ERROR CODE IN ELECTRICAL SYSTEM [E985](FUEL INJECTOR 5 DISC.) ERROR CODE IN ELECTRICAL SYSTEM [E986](FUEL INJECTOR 6 DISC.) ERROR CODE IN ELECTRICAL SYSTEM [E98A](FUEL INJECTOR 1-3 S/C) ERROR CODE IN ELECTRICAL SYSTEM [E98B](FUEL INJECTOR 4-6 S/C) ERROR CODE IN MECHANICAL SYSTEM [A000N1](ENGINE HIGH-IDLING SPEED OUT OF STANDARD) ERROR CODE IN MECHANICAL SYSTEM [A000N2](ENGINE LOW-IDLING SPEED OUT OF STANDARD) FAILURE CODE IN MECHANICAL SYSTEM [AA10NX](AIRCLEANER CLOGGING FAILURE CODE IN MECHANICAL SYSTEM [AB00KE](CHARGE VOLTAGE LOW) FAILURE CODE IN MECHANICAL SYSTEM [B@BAZG](ENG. OIL PRESS. LOW) FAILURE CODE IN MECHANICAL SYSTEM [B@BAZK](ENG. OIL LEVEL LOW) FAILURE CODE IN MECHANICAL SYSTEM [B@BCNS](ENG. WATER OVERHEAT) FAILURE CODE IN MECHANICAL SYSTEM [B@BCZK](ENG. WATER LVL LOW) FAILURE CODE IN MECHANICAL SYSTEM [B@HANS](HYDR. OIL OVERHEAT) TROUBLESHOOTING OF ELECTRICAL SYSTEM (E MODE) INFORMATION CONTAINED IN TROUBLESHOOTING TABLE E-1 ENGINE DOES NOT START(THE ENGINE DOES NOT ROTATE) E-2 PREHEATER DOES NOT OPERATE E-3 AUTO ENGINE WARM-UP DEVICE DOES NOT WORK E-4 AUTO-DECELERATOR DOES NOT OPERATE E-5 ALL WORK EQUIPMENT,SWING AND TRAVEL DO NOT MOVE E-6 ONE-TOUCH POWER MAX, FUNCTION DOES NOT OPERATE E-7 MACHINE PUSH-UP FUNCTION DOES NOT OPERATE NORMALLY E-8 ATTACHMENT CIRCUIT DOES NOT CHANGE E-9 NO DISPLAY IN MONITOR PANEL AT ALL E-10 PART OF DISPLAY ON MONITOR PANEL IS MISSING E-11 MONITOR PANEL DISPLAYS CONTENTS IRRELEVANT TO THE MODEL E-12 FUEL LEVEL MONITOR RED LAMP LIGHTS UP WHILE ENGINE IS RUNNING E-13 ENGINE WATER TEMPERATURE GAUGE DOES NOT DISPLAY CORRECTLY E-14 HYDRAULIC OIL TEMPERATURE GAUGE DOES NOT DISPLAY CORRECTLY E-15 FUEL GAUGE DOES NOT DISPLAY CORRECTLY E-16 SWING LOCK MONITOR DOES NOT DISPLAY CORRECTLY E-17 WHEN MONITOR SWITCH IS OPERATED,NOTHING IS DISPLAYED E-18 WINDSHIELD WIPER AND WINDOW WASHER DO NOT WORK E-19 ALARM BUZZER CANNOT BE CANCELLED E-20 "BOOM RAISE" IS NOT CORRECTLY DISPLAYED IN MONITOR FUNCTION E-21 "BOOM LOWER" IS NOT CORRECTLY DISPLAYED IN MONITOR FUNCTION E-22 "ARM IN" IS NOT DISPLAYED NORMALLY IN MONITORING FUNCTION E-23 "ARM DUMPING " IS NOT CORRECTLY DISPLAYED IN MONITOR FUNCTION E-24 "BUCKET CURL" IS NOT DISPLAYED NORMALLY IN MONITORING FUNCTION E-25 "BUCKET DUMPING" IS NOT CORRECTLY DISPLAYED IN MONITOR FUNCTION E-26 "SWING" IS NOT DISPLAYED NORMALLY IN MONITORING FUNCTION E-27 "TRAVEL" IS NOT CORRECTLY DISPLAYED IN MONITOR FUNCTION E-28 "TRAVEL DIFFERENTIAL PRESSURE" IS NOT CORRECTLY DISPLAYED IN MONITOR FUNCTION E-29 "SERVICE" IS NOT CORRECTLY DISPLAYED IN MONITOR FUNCTION E-30 TRAVEL ALARM DOES NOT SOUND OR DOES NOT STOP SOUNDING E-32 TROUBLESHOOTING FOR AIR CONDITIONER SYSTEM TROUBLESHOOTING OF HYDRAULIC AND MECHANICAL SYSTEM(H MODE) SYSTEM CHART FOR HYDRAULIC AND MECHANICAL SYSTEM INFORMATION CONTAINED IN TROUBLESHOOTING TABLE H-1 ALL WORK EQUIPMENT LACK POWER,OR TRAVEL AND SWING SPEEDS ARE SLOW H-2 ENGINE SPEED SHARPLY DROPS OR ENGINE STALLS H-3 NO WORK EQUIPMENT,TRAVEL OR SWING MOVE H-4 ABNORMAL NOISE IS HEARD FROM AROUND HYDRAULIC PUMP H-5 AUTO-DECELERATOR DOES NOT WORK H-6 FINE CONTROL MODE DOES NOT FUNCTION H-7 BOOM MOVES SLOWLY OR LACKS POWER H-8 ARM MOVES SLOWLY OR LACKS POWER H-9 BUCKET MOVES SLOWLY OR LACKS POWER H-10 WORK EQUIPMENT DOES NOT MOVE IN ITS SINGLE OPERATION H-11 WORK EQUIPMENT HAS A BIT TOO FAST HYDRAULIC DRIFT H-12 WORK EQUIPMENT HAS BIG TIME LAG H-13 OTHER WORK EQUIPMENT MOVES WHEN RELIEVING SINGLE CIRCUIT H-14 ONE-TOUCH POWER MAX. FUNCTION DOES NOT WORK H-15 MACHINE PUSH-UP FUNCTION DOES NOT WORK H-16 IN COMPOUND OPERATION,WORK EQUIPMENT WITH LARGER LOAD MOVES SLOWLY H-17 IN SWING + BOOM RAISE OPERATION,BOOM MOVES SLOWLY H-18 IN SWING + TRAVEL,TRAVEL SPEED DROPS SHARPLY H-19 MACHINE SWERVES IN TRAVEL H-20 MACHINE TRAVELS SLOWLY H-21 MACHINE CANNOT BE EASILY STEERED OR LACKS POWER H-22 TRAVEL SPEED DOES NOT SHIFT,OR IT IS SLOWER OR FASTER THAN PRESET SPEED H-23 TRACK SHOE DOES NOT TURN(ON ONE SIDE ONLY) H-24 MACHINE DOES NOT SWING H-25 SWING ACCELERATION IS POOR,OR SWING SPEED IS SLOW H-26 EXCESSIVE OVERRUN WHEN STOPPING SWING H-27 THERE IS BIG SHOCK WHEN STOPPING SWING H-28 THERE IS BIG ABNORMAL NOISE CAUSED WHEN STOPPING SWING H-29 SWING NATURAL DRIFT IS TOO BIG H-30 ATTACHMENT CIRCUIT DOES NOT CHANGE H-31 FLOW RATE IN ATTACHMENT CIRCUIT CANNOT BE ADJUSTED TROUBLESHOOTING OF ENGINE (S MODE) POINTS TO REMEMBER WHEN TROUBLESHOOTING METHOD OF USING TROUBLESHOOTING CHARTS S-1 STARTING PERFORMANCE IS POOR (STARTING ALWAYS TAKES TIME) S-2 ENGINE DOES NOT START S-3 ENGINE DOES NOT PICK UP SMOOTHLY(FOLLOW-UP IS POOR) S-4 ENGINE STOPS DURING OPERATIONS S-5 ENGINE DOES NOT ROTATE SMOOTHLY(HUNTING) S-6 ENGINE LACKS OUTPUT (OR LACKS POWER) S-7 EXHAUST SMOKE IS BLACK(INCOMPLETE COMBUSTION) S-8 OIL CONSUMPTION IS EXCESSIVE (OR EXHAUST SMOKE IS BLUE) S-9 OIL BECOMES CONTAMINATED QUICKLY S-10 FUEL CONSUMPTION IS EXCESSIVE S-11 OIL IS IN COOLING WATER (OR WATER SPURTS BACK, OR WATER LEVEL GOES DOWN) S-12 OIL PRESSURE CAUTION LAMP LIGHTS UP (DROP IN OIL PRESSURE) S-13 OIL LEVEL RISES (WATER,FUEL IN OIL) S-14 WATER TEMPERATURE BECOMES TOO HIGH(OVERHEATING) S-15 ABNORMAL NOISE IS MADE S-16 VIBRATION IS EXCESSIVE
30 DISASSEMBLY AND ASSEMBLY HOW TO READ THIS MANUAL PRECAUTIONS WHEN PERFORMING OPERATION SPECIAL TOOL LIST REMOVAL AND INSTALLATION OF CYLINDER HEAD ASSEMBLY REMOVAL AND INSTALLATION OF ENGINE REAR SEAL REMOVAL AND INSTALLATION OF ENGINE FRONT SEAL REMOVAL AND INSTALLATION OF FUEL SUPPLY PUMP ASSEMBLY REMOVAL AND INSTALLATION OF FUEL INJECTOR ASSEMBLY REMOVAL AND INSTALLATION OF NOZZLE TIP REMOVAL AND INSTALLATION OF STARTING MOTOR ASSEMBLY REMOVAL AND INSTALLATION OF RADIATOR ASSEMBLY REMOVAL AND INSTALLATION OF HYDRAULIC OIL COOLER ASSEMBLY REMOVAL AND INSTALLATION OF ENGINE AND HYDRAULIC PUMP ASSEMBLY REMOVAL AND INSTALLATION OF SWING CIRCLE ASSEMBLY REMOVAL AND INSTALLATION OF SWING MOTOR AND SWING MACHINERY ASSEMBLY DISASSEMBLY AND ASSEMBLY OF SWING MOTOR AND SWING MACHINERY ASSEMBLY REMOVAL AND INSTALLATION OF SPROCKET REMOVAL AND INSTALLATION OF TRAVEL MOTOR AND FINAL DRIVE ASSEMBLY DISASSEMBLY AND ASSEMBLY OF FINAL DRIVE ASSEMBLY DISASSEMBLY AND ASSEMBLY OF CARRIER ROLLER ASSEMBLY DISASSEMBLY AND ASSEMBLY OF TRAVEL ROLLER ASSEMBLY DISASSEMBLY AND ASSEMBLY OF IDLER ASSEMBLY DISASSEMBLY AND ASSEMBLY OF RECOIL SPRING ASSEMBLY EXPANSION AND INSTALLATION OF TRACK SHOE ASSEMBLY REMOVAL AND INSTALLATION OF AIR CONDITIONER UNIT ASSEMBLY REMOVAL AND INSTALLATION OF OPERATOR'S CAB REMOVAL AND INSTALLATION OF MONITOR ASSEMBLY REMOVAL AND INSTALLATION OF PUMP CONTROLLER REMOVAL AND INSTALLATION OF ENGINE CONTROLLER REMOVAL AND INSTALLATION OF REVOLVING FRAME ASSEMBLY REMOVAL AND INSTALLATION OF COUNTERWEIGHT ASSEMBLY REMOVAL AND INSTALLATION OF HYDRAULIC TANK ASSEMBLY REMOVAL AND INSTALLATION OF HYDRAULIC PUMP ASSEMBLY REMOVAL AND INSTALLATION OF OIL SEAL IN HYDRAULIC PUMP INPUT SHAFT REMOVAL AND INSTALLATION OF CONTROL VALVE ASSEMBLY DISASSEMBLY AND ASSEMBLY OF CONTROL VALVE ASSEMBLY REMOVAL AND INSTALLATION OF CENTER SWIVEL JOINT ASSEMBLY DISASSEMBLY AND ASSEMBLY OF CENTER SWIVEL JOINT ASSEMBLY DISASSEMBLY AND ASSEMBLY OF WORK EQUIPMENT PPC VALVE ASSEMBLY DISASSEMBLY AND ASSEMBLY OF TRAVEL PPC VALVE ASSEMBLY DISASSEMBLY AND ASSEMBLY OF HYDRAULIC CYLINDER ASSEMBLY REMOVAL AND INSTALLATION OF WORK EQUIPMENT ASSEMBLY REMOVAL AND INSTALLATION OF OPERATOR'S CAB GLASS (STUCK GLASS) REMOVAL AND INSTALLATION OF FRONT WINDOW ASSEMBLY