Komatsu Excavator PC270LC-6LE service & repair manual

Description Komatsu Excavator PC270LC-6LE service & repair manual

Komatsu Hydraulic Excavator PC270LC-6LE pdf workshop service repair manual + operation & maintenance manual

Serial number A83001 and up

MANUAL CONTENT:
GENERAL
GENERAL ASSEMBLY DRAWING
Specifications
WEIGHT TABLE
FUEL, COOLANT AND LUBRICANTS
ENGINE OIL SPECIFICATIONS
NORMAL OPERATION
ARCTIC OPERATION
DAMPER CASE, SWING MACHINERY CASE, TRACK FRONT IDLERS, TRACK ROLLERS, TOP CARRIER ROLLERS AND HYDRAULIC SYSTEM OIL SPECIFICATIONS
FINAL DRIVE OIL SPECIFICATIONS
DIESEL FUEL SPECIFICATIONS
COOLANT SPECIFICATIONS
GENERAL
WATER
ANTIFREEZE

STRUCTURE AND FUNCTION
Engine related parts
Radiator and oil cooler
Power train
Final drive
Swing circle
Swing machinery
Track frame
Hydraulic piping drawing
Hydraulic circuit diagram
Hydraulic tank
Hydraulic pump
Basic pump
LS (load sensing) and PC (power control) valve
In-line oil filter
Outline
Control valve
Outline
Nine-spool valve (standard plus three service valves)
Main structure
Six-spool valve (standard)
Safety-suction valve for service valve
Self-reducing pressure valve
Function
Operation
CLSS
Outline of CLSS
Operation for each function and valve
Operation of CLSS system as a whole
Swing motor
Basic motor
Swing lock valve
Relief valve portion
Reverse prevention valve (swing dampening)
Center swivel joint
Travel motor
Valve control
Work equipment and swing PPC valve
Operation
Travel PPC valve
Operation
Service PPC valve
Operation
Safety lock valve
Straight-travel system
Function
EPC valve
Operation
Boom lock valve
Operation
Additional filter for breaker
Work equipment
Air conditioner
Basic information on air conditioners
Units related to refrigeration
Principle of cooling
Refrigerants
Safety precautions
Refrigerator oil (lube oil)
Air conditioning condenser
Function
General description
Air conditioner compressor
Receiver with sight glass
Air conditioner unit
Outline
Electrical wiring diagram
Engine control system
Function
Operation of system
Components of system
Electronic control system
Total system diagram
Pump and engine mutual control function
Pump and valve control function
Power maximizing and swift slow-down function
Auto-deceleration function
Automatic warming-up and engine overheat prevention function
Swing control function
Travel control function
Active mode function
Components of system
Machine monitor system
Function
Monitor panel
Monitor display
Oil maintenance function
Switches
Sensors
Coolant level sensor
Engine oil level sensor
Hydraulic oil sensor
Engine oil pressure sensor
Coolant temperature sensor
Fuel level sensor
Air cleaner clogging sensor

TESTING, ADJUSTING AND TROUBLESHOOTING
TESTING AND ADJUSTING
STANDARD VALUES TABLE
For chassis
TOOLS FOR TESTING, ADJUSTING AND TROUBLESHOOTING
MEASURING ENGINE SPEED
MEASURING EXHAUST GAS COLOR
ADJUSTING VALVE CLEARANCE
MEASURING COMPRESSION PRESSURE
MEASURING BLOW-BY PRESSURE
TESTING AND ADJUSTING FUEL INJECTION TIMING
MEASURING ENGINE OIL PRESSURE
TESTING AND ADJUSTING FAN BELT TENSION
TESTING AND ADJUSTING A/C COMPRESSOR BELT TENSION
ADJUSTING THE ENGINE SPEED SENSOR
TESTING AND ADJUSTING GOVERNOR MOTOR LEVER STROKE
MEASURING EQUIPMENT CYCLE TIMES
TESTING AND ADJUSTING PILOT OIL PRESSURE
TESTING AND ADJUSTING MAIN HYDRAULIC PRESSURE IN WORK EQUIPMENT, SWING,AND TRAVEL CIRCUIT
TESTING SERVO PISTON INPUT PRESSURE
TESTING AND ADJUSTING LS DIFFERENTIAL PRESSURE
TESTING AND ADJUSTING PC VALVE
TESTING SOLENOID VALVE OUTPUT PRESSURES (LS-EPC, PC-EPC AND ON/OFF SOLENOID VALVES)
MEASURING PPC VALVE OUTPUT PRESSURE
Pressure switch piping diagram
ADJUSTING WORK EQUIPMENT ! SWING PPC VALVE
TESTING TRAVEL DEVIATION
TESTING LOCATIONS CAUSING HYDRAULIC DRIFT OF WORK EQUIPMENT
MEASURING OIL LEAKAGE
RELEASING REMAINING PRESSURE IN HYDRAULIC CIRCUIT
TESTING CLEARANCE OF SWING CIRCLE BEARING
TESTING AND ADJUSTING TRACK SHOE TENSION
BLEEDING AIR
TROUBLESHOOTING
POINTS TO REMEMBER WHEN TROUBLESHOOTING
SEQUENCE OF EVENTS IN TROUBLESHOOTING
POINTS TO REMEMBER WHEN CARRYING OUT MAINTENANCE
Points to remember when handling electric equipment
Points to remember when troubleshooting electric circuits
Points to remember when handling hydraulic equipment
CHECKS BEFORE TROUBLESHOOTING
CONNECTOR TYPES AND MOUNTING LOCATIONS
CONNECTION TABLE FOR CONNECTOR PIN NUMBERS
EXPLANATION OF CONTROL MECHANISM FOR ELECTRICAL SYSTEM
DISPLAY METHOD AND SPECIAL FUNCTIONS OF MONITOR PANEL
METHOD OF USING JUDGEMENT TABLE
METHOD OF USING TROUBLESHOOTING CHARTS
DETAILS OF TROUBLESHOOTING AND TROUBLESHOOTING PROCEDURE
SERVICE CODE TABLE
TROUBLESHOOTING OF COMMUNICATION ABNORMALITY SYSTEM (N MODE)
N-1 Communications abnormality
TROUBLESHOOTING OF ENGINE THROTTLE PUMP CONTROLLER (GOVERNOR CONTROL SYSTEM) (E MODE)
POINTS TO REMEMBER WHEN CARRYING OUT TROUBLESHOOTING OF ENGINE
THROTTLE PUMP CONTROLLER SYSTEM
ACTION TAKEN BY CONTROLLER WHEN ABNORMALITY OCCURS AND PROBLEMS ON MACHINE
JUDGEMENT TABLE FOR ENGINE THROTTLE PUMP CONTROLLER (GOVERNOR CONTROL SYSTEM) AND ENGINE RELATED PARTS
ELECTRICAL CIRCUIT DIAGRAM FOR E MODE SYSTEM

DISASSEMBLY AND ASSEMBLY
When removing or installing unit assemblies
General precautions
Listing of special tools
PRECAUTIONS WHEN CARRYING OUT OPERATION
Precautions when carrying out removal work
Precautions when carrying out installation work
Precautions when completing the operations
SPECIAL TOOLS LIST
SPECIAL TOOL SKETCH
STARTER MOTOR
ALTERNATOR
AIR CONDITIONER COMPRESSOR
AIR CONDITIONER CONDENSER
RECEIVER DRIER
FUEL INJECTION PUMP
WATER PUMP
NOZZLE HOLDER
TURBOCHARGER
THERMOSTAT
GOVERNOR MOTOR
CYLINDER HEAD ASSEMBLY
RADIATOR HYDRAULIC OIL COOLER
ENGINE, MAIN PUMP
DAMPER
FUEL TANK
CENTER SWIVEL JOINT
FINAL DRIVE
SPROCKET
SWING MOTOR AND MACHINERY
SWING MACHINERY
REVOLVING FRAME
SWING CIRCLE
IDLER RECOIL SPRING
IDLER
TRACK ROLLER
CARRIER ROLLER
TRACK SHOE
HYDRAULIC TANK
MAIN PUMP
MAIN PUMP INPUT SHAFT OIL SEAL
CONTROL VALVE
PUMP MERGE-DIVIDER VALVE
MAIN RELIEF VALVE
PC VALVE
LS VALVE
PC-EPC, LS-EPC VALVES
SOLENOID VALVE
WORK EQUIPMENT - SWING PPC VALVE
TRAVEL PPC VALVE
BOOM LOCK VALVE
BOOM CYLINDER
ARM CYLINDER
BUCKET CYLINDER
WORK EQUIPMENT
BUCKET
ARM
BUCKET - ARM
BOOM
OPERATOR’S CAB
COUNTERWEIGHT
ENGINE THROTTLE - PUMP CONTROLLER
CONTROL STAND CASE
MONITOR

MAINTENANCE STANDARD
SWING MACHINERY
SWING CIRCLE
FINAL DRIVE
TRACK FRAME AND RECOIL SPRING
CARRIER ROLLER
IDLER
TRACK ROLLER
TRACK SHOE
HYDRAULIC PUMP
CONTROL VALVE
VARIABLE PRESSURE COMPENSATION VALVE
SAFETY-SUCTION VALVE FOR SERVICE VALVE
SELF-REDUCING PRESSURE VALVE
SWING MOTOR
TRAVEL MOTOR
WORK EQUIPMENT AND SWING PPC VALVES
TRAVEL PPC VALVE
SERVICE PPC VALVE
EPC SOLENOID VALVE
CENTER SWIVEL JOINT
BOOM LOCK VALVE
HYDRAULIC CYLINDER
WORK EQUIPMENT
DIMENSION OF WORK EQUIPMENT
Arm portion
Bucket portion
MAINTENANCE STANDARD

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