KOMATSU PC300-6, PC300LC-6, PC350-6, PC350LC-6 Hydraulic Excavator Operation & Maintenance Manual (S/N: 33001 and up, 12001 and

HYDRAULIC EXCAVATOR TEN00117-08 PC300 PC300LC - PC350 PC350LC Komatsu has Operation & Maintenance Manuals written in some other languages. If a foreign language manual is necessary, contact your local distributor for availability. NOTICE Unsafe use of this machine may cause serious injury or death. Operators and maintenance personnel must read this manual before operating or maintaining this machine. This manual should be kept near the machine for reference and periodically reviewed by all personnel who will come into contact with it. WARNING

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. FOREWORD BEFORE READING THIS MANUAL BEFORE READING THIS MANUAL This manual gives details of the operation and methods of inspection and maintenance for this machine that must be obeyed in order to use the machine safely. Most accidents are caused by the failure to follow fundamental safety rules for the operation and maintenance of machines. Read, understand and follow all precautions and warnings in this manual and on the machine before performing operation and maintenance. Failure to do so may result in serious injury or death. Komatsu cannot predict every circumstance that might involve a potential hazard when the machine is used. Therefore, the safety messages in this manual and on the machine may not include all possible safety precautions. If you carry out any operation, inspection, or maintenance under conditions that are not described in this manual, understand that it is your responsibility to take the necessary precautions to ensure safety. In no event should you or others engage in the prohibited uses or actions described in this manual. Improper operation and maintenance of the machine can be hazardous and could result in serious injury or death. If you sell the machine, be sure to give this manual to the new owner together with the machine. Always keep this Operation and Maintenance Manual in the location shown on the right so that all relevant personnel can read it at any time. Storage location for the Operation and Maintenance Manual: magazine box on the left side of the operator's seat. If this manual is lost or damaged, contact your distributor immediately to arrange for its replacement. For details regarding the machine serial No. you will need to provide your Komatsu distributor, see "YOUR MACHINE SERIAL NUMBERS AND DISTRIBUTOR (PAGE 1-6)". This manual uses the international units (SI) for units of measurement. For reference, units that have been used in the past are given in ( ). The explanations, values, and illustrations in this manual have been prepared based on the latest information available as of the date of its publication. Continuing improvements in the design of this machine may lead to additional changes that are not reflected in this manual. Consult Komatsu or your Komatsu distributor for the latest available information concerning your machine or with questions regarding information contained in this manual. The numbers in circles in the illustrations correspond to the numbers in ( ) in the text. (For example: 1 → (1)) Komatsu delivers machines that comply with all applicable regulations and standards of the country to which it has been shipped. If this machine has been purchased in another country, it may lack certain safety devices and specifications that are necessary for use in your country. If there is any question about whether your product complies with the applicable standards and regulations of your country, consult Komatsu or your Komatsu distributor before operating the machine. 1 - 2

. FOREWORD SAFETY INFORMATION SAFETY INFORMATION To enable you to use the machine safely, and to prevent injury to operators, service personnel or bystanders, the precautions and warnings included in this manual and the safety signs attached to the machine must always be followed. To identify important safety messages in the manual and on the machine labels, the following signal words are used. The "Safety Alert Symbol" identifies important safety messages on machines, in manuals, and elsewhere. When you see this symbol, be alert to the risk of personal injury or death. Follow the instructions in the safety message. This signal word indicates an imminently hazardous situation which, if not avoided, will result in death or serious injury. This signal word indicates a potentially hazardous situation which, if not avoided, could result in death or serious injury. This signal word indicates a potentially hazardous situation exists which, if not avoided, may result in minor or moderate injury. The following signal words are used to alert you to information that must be followed to avoid damage to the machine. This precaution is given where the machine may be damaged or the service life reduced if the precaution is not followed. This word is used for information that is useful to know. 1 - 3

. FOREWORD INTRODUCTION INTRODUCTION USE OF MACHINE This Komatsu machine is designed to be used mainly for the following work: Digging work Leveling work Ditching work Loading work Demolition work See the section "RECOMMENDED APPLICATIONS (PAGE 3-127)" for further details. DIRECTIONS OF MACHINE (A) (B) (C) (D) Front Rear Left Right (E) (F) Operator's seat Sprocket In this manual, the terms front, rear, left, and right refer to the travel direction as seen from the operator's seat when the operator's seat is facing the front and the sprocket is at the rear of the machine. VISIBILITY FROM OPERATOR'S SEAT This machine complies with the visibility standard (ISO 5006). This machine maintains a close visibility of a height of 1.5 m at a point 1 m away from the outside surface of the machine, and a visibility for a circumference of 12 m. 1 - 4

. FOREWORD PRODUCT INFORMATION PRODUCT INFORMATION When requesting service or ordering replacement parts, please inform your Komatsu distributor of the following items. PRODUCT IDENTIFICATION NUMBER (PIN)/MACHINE SERIAL NO. PLATE On the bottom right of the operator's cab The design of the nameplate differs according to the territory. EPA REGULATIONS, ENGINE NUMBER PLATE On the upper side of the engine cylinder head cover. EPA: Environmental Protection Agency, U.S.A. 1 - 5

. FOREWORD PRODUCT INFORMATION SERVICE METER LOCATION On top of the machine monitor YOUR MACHINE SERIAL NUMBERS AND DISTRIBUTOR Machine serial No. Engine serial No. Product identification number (PIN) Distributor name Address Service Personnel Phone/Fax 1 - 6

. FOREWORD CONTENTS 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 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 - 5 SAFETY LABELS 2 - 6 GENERAL PRECAUTIONS COMMON TO OPERATION AND MAINTENANCE 2 - 12 PRECAUTIONS BEFORE STARTING OPERATION 2 - 12 PREPARATIONS FOR SAFE OPERATION 2 - 12 FIRE PREVENTION 2 - 14 PRECAUTIONS WHEN GETTING ON OR OFF MACHINE 2 - 15 DO NOT GET CAUGHT IN WORK EQUIPMENT 2 - 17 PRECAUTIONS RELATED TO PROTECTIVE STRUCTURES 2 - 17 PROTECTION AGAINST FALLING, FLYING, INTRUDING OBJECTS 2 - 17 UNAUTHORIZED MODIFICATION 2 - 18 PRECAUTIONS RELATED TO ATTACHMENTS AND OPTIONS 2 - 18 PRECAUTIONS RELATED TO CAB GLASS 2 - 18 PRECAUTIONS WHEN RUNNING ENGINE INSIDE BUILDING 2 - 18 PRECAUTIONS FOR OPERATION 2 - 19 PRECAUTIONS FOR JOBSITE 2 - 19 STARTING ENGINE 2 - 21 OPERATION 2 - 23 TRANSPORTATION 2 - 31 TOWING 2 - 32 LIFTING OBJECTS WITH BUCKET 2 - 33 PRECAUTIONS FOR MAINTENANCE 2 - 34 PRECAUTIONS BEFORE STARTING INSPECTION AND MAINTENANCE 2 - 34 PRECAUTIONS FOR INSPECTION AND MAINTENANCE 2 - 38 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 - 35 CONTROL LEVERS AND PEDALS 3 - 40 SUN ROOF 3 - 43 WINDSHIELD 3 - 43 1 - 7

. FOREWORD CONTENTS EMERGENCY EXIT FROM OPERATOR'S CAB 3 - 48 DOOR LOCK 3 - 48 CAP WITH LOCK 3 - 49 HOT AND COOL BOX 3 - 50 MAGAZINE BOX 3 - 51 ASHTRAY 3 - 51 AIR CONDITIONER CONTROLS 3 - 52 RADIO 3 - 66 AUXILIARY ELECTRIC POWER 3 - 71 FUSE 3 - 72 FUSIBLE LINK 3 - 73 CONTROLLER 3 - 73 TOOL BOX 3 - 73 GREASE PUMP HOLDER 3 - 74 MACHINE OPERATIONS AND CONTROLS 3 - 75 BEFORE STARTING ENGINE 3 - 75 STARTING ENGINE 3 - 93 AFTER STARTING ENGINE 3 - 96 STOPPING THE ENGINE 3 - 107 MACHINE OPERATION 3 - 108 STEERING THE MACHINE 3 - 112 SWINGING 3 - 114 WORK EQUIPMENT CONTROLS AND OPERATIONS 3 - 115 WORKING MODE 3 - 117 PROHIBITED OPERATIONS 3 - 118 GENERAL OPERATION INFORMATION 3 - 123 TRAVELING ON SLOPES 3 - 124 ESCAPE FROM MUD 3 - 126 RECOMMENDED APPLICATIONS 3 - 127 BUCKET REPLACEMENT AND INVERSION 3 - 129 PARKING MACHINE 3 - 133 MACHINE INSPECTION AFTER DAILY WORK 3 - 134 LOCKING 3 - 135 TRANSPORTATION 3 - 136 TRANSPORTATION PROCEDURE 3 - 136 LOADING AND UNLOADING WITH TRAILER 3 - 137 LIFTING MACHINE 3 - 146 COLD WEATHER OPERATION 3 - 148 COLD WEATHER OPERATION INFORMATION 3 - 148 AFTER DAILY WORK COMPLETION 3 - 151 AFTER COLD WEATHER SEASON 3 - 151 LONG TERM STORAGE 3 - 152 BEFORE STORAGE 3 - 152 DURING STORAGE 3 - 152 AFTER STORAGE 3 - 153 STARTING MACHINE AFTER LONG-TERM STORAGE 3 - 153 TROUBLES AND ACTIONS 3 - 154 RUNNING OUT OF FUEL 3 - 154 PHENOMENA THAT ARE NOT FAILURES 3 - 155 TOWING THE MACHINE 3 - 156 1 - 8

. FOREWORD CONTENTS LIGHTWEIGHT TOWING HOLE 3 - 157 SEVERE JOB CONDITION 3 - 157 DISCHARGED BATTERY 3 - 158 OTHER TROUBLE 3 - 162 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 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 INITIAL 1000 HOURS MAINTENANCE (ONLY AFTER THE FIRST 1000 HOURS) 4 - 18 WHEN REQUIRED 4 - 19 CHECK BEFORE STARTING 4 - 46 EVERY 50 HOURS MAINTENANCE 4 - 47 EVERY 250 HOURS MAINTENANCE 4 - 48 EVERY 500 HOURS MAINTENANCE 4 - 54 EVERY 1000 HOURS MAINTENANCE 4 - 67 EVERY 2000 HOURS MAINTENANCE 4 - 73 EVERY 4000 HOURS MAINTENANCE 4 - 80 EVERY 5000 HOURS MAINTENANCE 4 - 83 EVERY 8000 HOURS MAINTENANCE 4 - 85 SPECIFICATIONS 5 - 1 SPECIFICATIONS 5 - 2 ATTACHMENTS AND OPTIONS 6 - 1 GENERAL PRECAUTIONS FOR SAFETY 6 - 2 PRECAUTIONS WHEN SELECTING 6 - 2 READ THE INSTRUCTION MANUAL THOROUGHLY 6 - 2 PRECAUTIONS WHEN REMOVING OR INSTALLING 6 - 2 PRECAUTIONS WHEN USING 6 - 2 BUCKET WITH HOOK 6 - 3 HOOK CONDITION 6 - 3 PROHIBITED OPERATIONS 6 - 3 MACHINE READY FOR ATTACHMENT 6 - 4 LOCATIONS 6 - 4 HYDRAULIC CIRCUIT 6 - 8 ATTACHMENT REMOVAL AND INSTALLATION 6 - 13 ATTACHMENT OPERATIONS 6 - 17 LONG TERM STORAGE 6 - 18 1 - 9

KOMATSU PC300-6, PC300LC-6, PC350-6, PC350LC-6 Hydraulic Excavator Operation & Maintenance Manual (S/N: 33001 and up, 12001 and

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