Komatsu PC20R-8, PC27R-8 Hydraulic Excavator Service Repair Shop Manual - WEBM000201

This Complete Service Repair Workshop Manual PDF Download for the PC20R-8, PC27R-8 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 PC20R-8 - S/N: F30791 and up
Komatsu PC27R-8 - S/N: F31103 and up


TABLE OF CONTENTS :

10 STRUCTURE AND FUNCTION
20 TESTING AND ADJUSTING
30 REMOVAL AND INSTALLATION
40 MAINTENANCE STANDARD


MANUAL SPECIFICATION :

File Format : PDF
Language : English
Printable : Yes
Searchable : Yes
Bookmarked : Yes
Product Code : WEBM000201
Total Pages : 298


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
LIST OF REVISED PAGES
SAFETY
FOREWORD
HOW TO READ THE SHOP MANUAL
HOISTING INSTRUCTIONS
STANDARD TIGHTENING TORQUE
COATING MATERIALS
ELECTRIC WIRE CODE
WEIGHT TABLE
TABLE OF OIL AND COOLANT QUANTITIES

10.STRUCTURE AND FUNCTION
POWER TRAIN
SWING CIRCLE
SWING MACHINERY PC27R-8
FINAL DRIVE
TRACK FRAME
RECOIL SPRING
CARRIER ROLLER PC27R-8
TRACK ROLLER
STEEL SHOE
HYDRAULIC SYSTEM PC20R-8
HYDRAULIC SYSTEM PC27R-8
HYDRAULIC CIRCUIT DIAGRAM PC20R-8
HYDRAULIC CIRCUIT DIAGRAM PC27R-8
HYDRAULIC PUMP PC20R-8
HYDRAULIC PUMP PC27R-8
TCC VALVE, LS VALVE, SERVO PISTON
CONTROL VALVE
CLSS
SWIVEL JOINT
SWING MOTOR
TRAVEL MOTOR
CYLINDER
ACCUMULATOR
PPC VALVE
PPC VALVE
SOLENOID VALVE
ELECTRICAL DIAGRAM (1/3)
ELECTRICAL DIAGRAM (2/3)
ELECTRICAL DIAGRAM (3/3)

20.TESTING AND ADJUSTMENT
NORMAL OR STANDARD TECHNICAL DATA
SPECIAL TOOLS
CHECKING THE ENGINE SPEED
ADJUSTMENT OF VALVE CLEARANCE
MEASUREMENT OF THE COMPRESSION PRESSURE
CONTROL AND ADJUSTMENT OF THE TENSION OF THE FAN BELT
CONTROL AND ADJUSTMENT OF THE INJECTION TIMING
CONTROL AND ADJUSTMENT OF THE ACCELERATOR STROKE
ADJUSTMENT OF THE STROKE OF THE BLADE COMMAND LEVER
ADJUSTING THE FLEXIBLE CABLES
CONTROL AND ADJUSTMENT OF THE STROKE OF THE TRAVEL LEVER
ADJUSTMENT OF THE STROKE OF THE BOOM SWING COMMAND PEDAL
ADJUSTMENT OF THE PPC VALVE CLEARANCES
ADJUSTMENT OF THE RUBBER PAD AND SAFETY MICROSWITCH FOR SERVO-CONTROL ENGAGEMENT
CONTROL AND ADJUSTMENT OF THE TRACK-SHOE TENSION
CONTROL AND REGULATION OF THE PRESSURES IN THE HYDRAULIC CIRCUITS
CONTROL AND REGULATION OF THE LS DIFFERENTIAL PRESSURE AND ADJUSTMENT OF THE LS VALVE (PC20R-8)
REGULATION OF THE PC VALVE (PC20R-8)
CONTROL AND REGULATION OF THE LS DIFFERENTIAL PRESSURE AND ADJUSTMENT OF THE LS VALVE (PC27R-8)
REGULATION OF THE PC VALVE (PC27R-8)
CONTROL AND REGULATION OF THE SERVO-CONTROL POWER SUPPLY
ELIMINATION OF RESIDUAL PRESSURES - PRESSURISATION OF THE TANK
BLEEDING AIR FROM THE HYDRAULIC CIRCUITS
CONTROL OF HYDRAULIC DRIFTS - ANALYSIS OF THE CAUSES OF A DRIFT
CHECKING FOR ANY LEAKAGES INSIDE THE WORKING EQUIPMENT CYLINDERS
CHECKING FOR ANY LEAKAGES INSIDE THE SWING MOTOR
METHODS FOR TESTING FOR LEAKAGES INSIDE THE SWIVEL JOINT

30.REMOVAL AND INSTALLATION
HOW TO READ THE MANUAL
PRECAUTIONS TO BE TAKEN WHILE WORKING
SPECIAL TOOLS
STARTER MOTOR
ALTERNATOR
INJECTION PUMP
NOZZLE HOLDER
WATER COOLANT PUMP
CYLINDER HEAD
ENGINE HOOD
CANOPY
CAB
HEATING FAN
COUNTERWEIGHT
FUEL TANK
HYDRAULIC TANK
OIL-COOLER - RADIATOR GROUP
ENGINE-PUMP GROUP
PUMP
ENGINE-PUMP COUPLING
LATERAL LOWER COVER
INNER CONTROL VALVE BOX COVER
CONTROL VALVE
LEFT-HAND PPC VALVE (ARM-BUCKET)
RIGHT-HAND PPC VALVE (BOOM-BUCKET)
SERVOCONTROL SOLENOID GROUP
PLATFORM
SWIVEL JOINT
SWING MACHINERY
REVOLVING FRAME
SWING CIRCLE
RUBBER TRACK SHOES
STEEL TRACK-SHOES
SPROCKET WHEEL
FINAL DRIVE
IDLER AND RECOIL SPRING
SPRING RECOIL AND THRUST CYLINDER GROUPS
IDLER
TRACK ROLLERS
BOOM CYLINDER
ARM CYLINDER
BUCKET CYLINDER
BOOM SWING CYLINDER
BLADE CYLINDER
WORK EQUIPMENT CYLINDERS
UPPER WORK EQUIPMENT
BUCKET
ARM
ARM ASSEMBLY
BOOM
BOOM SWING SUPPORT
BLADE

40.STANDARD MAINTENANCE
SWING CIRCLE
SWING MACHINERY PC27R-8
FINAL DRIVE
SPROCKET
TRACK FRAME AND RECOIL SPRING
IDLER
CARRIER ROLLER PC27R-8
TRACK ROLLER
TRACK SHOE
HYDRAULIC PUMP
CONTROL VALVE
SWIVEL JOINT
SWING MOTOR
TRAVEL MOTOR
PPC VALVE
CYLINDER
WORK EQUIPMENT PC20R-8
WORK EQUIPMENT PC27R-8

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