Komatsu PC120-8 Hydraulic Excavator Index:

CONTENTS
FOREWORD 1- 1
BEFORE READING THIS MANUAL 1- 2
SAFETY INFORMATION 1- 3
INTRODUCTION 1- 4
USE OF MACHINE 1- 4
DIRECTIONS OF MACHINE 1- 4
VISIBILITY FROM OPERATOR’S SEAT 1- 4
PROTECTIVE STRUCTURE 1- 4
PRODUCT INFORMATION 1- 5
PRODUCT IDENTIFICATION NUMBER (PIN)/MACHINE SERIAL NO. PLATE 1- 5
EPA REGULATIONS, ENGINE NUMBER PLATE 1- 5
SERVICE METER LOCATION 1- 6
YOUR MACHINE SERIAL NUMBERS AND DISTRIBUTOR 1- 6
SAFETY 2- 1
SAFETY 2- 2
SAFETY LABELS 2- 5
LOCATION OF SAFETY LABELS 2- 6
SAFETY LABELS 2- 7
GENERAL PRECAUTIONS COMMON TO OPERATION AND MAINTENANCE 2- 14
PRECAUTIONS BEFORE STARTING OPERATION 2- 14
PREPARATIONS FOR SAFE OPERATION 2- 14
FIRE PREVENTION 2- 16
PRECAUTIONS WHEN GETTING ON OR OFF MACHINE 2- 17
DO NOT GET CAUGHT IN WORK EQUIPMENT 2- 19
PRECAUTIONS RELATED TO PROTECTIVE STRUCTURES 2- 19
PROTECTION AGAINST FALLING, FLYING, INTRUDING OBJECTS 2- 20
UNAUTHORIZED MODIFICATION 2- 20
PRECAUTIONS RELATED TO ATTACHMENTS AND OPTIONS 2- 20
PRECAUTIONS RELATED TO CAB GLASS 2- 20
PRECAUTIONS WHEN RUNNING ENGINE INSIDE BUILDING 2- 21
PRECAUTIONS FOR OPERATION 2- 22
PRECAUTIONS FOR JOBSITE 2- 22
STARTING ENGINE 2- 24
OPERATION 2- 26
TRANSPORTATION 2- 34
TOWING 2- 35
LIFTING OBJECTS WITH BUCKET 2- 36
PRECAUTIONS FOR MAINTENANCE 2- 37
PRECAUTIONS BEFORE STARTING INSPECTION AND MAINTENANCE 2- 37
PRECAUTIONS FOR INSPECTION AND MAINTENANCE 2- 41
OPERATION 3- 1
MACHINE VIEW ILLUSTRATIONS 3- 2
OVERALL MACHINE VIEW 3- 2
CONTROLS AND GAUGES 3- 3
DETAILED CONTROLS AND GAUGES 3- 5
MONITORING SYSTEM 3- 5
SWITCHES 3- 70
CONTROL LEVERS AND PEDALS 3- 75
SUN ROOF 3- 78

WINDSHIELD 3- 78
EMERGENCY ESCAPE HAMMER 3- 84
DOOR LOCK 3- 84
CAP WITH LOCK 3- 85
DRINK BOX 3- 86
MAGAZINE BOX 3- 86
ASHTRAY 3- 86
AIR CONDITIONER CONTROLS 3- 87
RADIO 3-100
AUXILIARY ELECTRIC POWER 3-105
FUSE 3-106
SLOW BLOW FUSE 3-107
CONTROLLER 3-107
TOOL BOX 3-107
GREASE PUMP HOLDER 3-107
FIRE EXTINGUISHER 3-108
MACHINE OPERATIONS AND CONTROLS 3-109
BEFORE STARTING ENGINE 3-109
STARTING ENGINE 3-128
AFTER STARTING ENGINE 3-133
STOPPING THE ENGINE 3-144
MACHINE OPERATION 3-145
STEERING THE MACHINE 3-149
SWINGING 3-151
WORK EQUIPMENT CONTROLS AND OPERATIONS 3-152
WORKING MODE 3-154
PROHIBITED OPERATIONS 3-156
GENERAL OPERATION INFORMATION 3-159
TRAVELING ON SLOPES 3-161
ESCAPE FROM MUD 3-163
RECOMMENDED APPLICATIONS 3-164
BUCKET REPLACEMENT AND INVERSION 3-166
PARKING MACHINE 3-169
MACHINE INSPECTION AFTER DAILY WORK 3-170
LOCKING 3-171
ROAD LINERS 3-172
TRANSPORTATION 3-174
TRANSPORTATION PROCEDURE 3-174
LOADING AND UNLOADING WITH TRAILER 3-175
LIFTING MACHINE 3-184
COLD WEATHER OPERATION 3-187
COLD WEATHER OPERATION INFORMATION 3-187
AFTER DAILY WORK COMPLETION 3-189
AFTER COLD WEATHER SEASON 3-189
LONG TERM STORAGE 3-190
BEFORE STORAGE 3-190
DURING STORAGE 3-190
AFTER STORAGE 3-191
STARTING MACHINE AFTER LONG-TERM STORAGE 3-191
TROUBLES AND ACTIONS 3-192
1 – 8
.
FOREWORD CONTENTS
RUNNING OUT OF FUEL 3-192
PHENOMENA THAT ARE NOT FAILURES 3-192
TOWING THE MACHINE 3-193
LIGHTWEIGHT TOWING HOLE 3-194
SEVERE JOB CONDITION 3-194
DISCHARGED BATTERY 3-195
OTHER TROUBLE 3-199
MAINTENANCE 4- 1
MAINTENANCE INFORMATION 4- 2
OUTLINE OF SERVICE 4- 4
HANDLING OIL, FUEL, COOLANT, AND PERFORMING OIL CLINIC 4- 4
ELECTRIC SYSTEM MAINTENANCE 4- 7
WEAR PARTS 4- 8
WEAR PARTS LIST 4- 8
RECOMMENDED FUEL, COOLANT, AND LUBRICANT 4- 9
USE OF FUEL, COOLANT AND LUBRICANTS ACCORDING TO AMBIENT TEMPERATURE 4- 10
RECOMMENDED BRANDS, RECOMMENDED QUALITY FOR PRODUCTS OTHER THAN
KOMATSU GENUINE OIL 4- 11
TIGHTENING TORQUE SPECIFICATIONS 4- 12
TIGHTENING TORQUE LIST 4- 12
SAFETY CRITICAL PARTS 4- 13
SAFETY CRITICAL PARTS LIST 4- 14
MAINTENANCE SCHEDULE 4- 15
MAINTENANCE SCHEDULE CHART 4- 15
MAINTENANCE INTERVAL FOR HYDRAULIC BREAKER 4- 17
MAINTENANCE PROCEDURE 4- 18
WHEN REQUIRED 4- 18
CHECK BEFORE STARTING 4- 46
EVERY 100 HOURS MAINTENANCE 4- 47
EVERY 250 HOURS MAINTENANCE 4- 49
EVERY 500 HOURS MAINTENANCE 4- 54
EVERY 1000 HOURS MAINTENANCE 4- 65
EVERY 2000 HOURS MAINTENANCE 4- 71
EVERY 4000 HOURS MAINTENANCE 4- 75
EVERY 5000 HOURS MAINTENANCE 4- 77
EVERY 8000 HOURS MAINTENANCE 4- 78
SPECIFICATIONS 5- 1
SPECIFICATIONS 5- 2
ATTACHMENTS AND OPTIONS 6- 1
ATTACHMENTS AND OPTIONS – GENERAL INFORMATION 6- 2
SAFETY FIRST 6- 2
ATTACHMENT INSTALLATION 6- 3
BUCKET WITH HOOK 6- 4
HOOK CONDITION 6- 4
PROHIBITED OPERATIONS 6- 4
MACHINE READY FOR ATTACHMENT 6- 5
LOCATIONS 6- 5
HYDRAULIC CIRCUIT 6- 9
ATTACHMENT REMOVAL AND INSTALLATION 6- 10
ATTACHMENT OPERATIONS 6- 14

LONG TERM STORAGE 6- 18
SPECIFICATIONS 6- 18
ATTACHMENT GUIDE 6- 19
ATTACHMENT COMBINATIONS 6- 20
TRACK SHOES SELECTION 6- 21
HANDLING OF RUBBER PAD SHOE AND ROAD LINER 6- 22
RECOMMENDED ATTACHMENT OPERATIONS 6- 24
HYDRAULIC BREAKER 6- 24
HANDLING MACHINES EQUIPPED WITH KOMTRAX 6- 29
BASIC PRECAUTIONS 6- 29
INDEX 7- 1